固定速率的 ScheduledExecutorService 计划没有像预期的那样准确
ScheduledExecutorService schedule at fixed rate not working as accurate as expected
我有一个 Java 项目 (Java 8)，它应该每 10 毫秒执行一次任务。我使用 java ScheduledExecutorService 来 运行 任务：
ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
executorService.scheduleAtFixedRate(new QueueTask(), 0, 10, TimeUnit.MILLISECONDS);
QueueTask 扩展 Runnable 并从队列中轮询 - 不超过 10 毫秒。 QueueTask 的每个 运行 我都会记录“已启动的 QueueTask”。
出于某种原因，根据日志，任务 运行ning 在同一毫秒，我不明白为什么。例如：
2022-03-09 15:24:32.362 INFO 12536 --- [pool-1-thread-1] com.example.consumer.QueueTask : started QueueTask, uuid: 40bf7e61-66f3-4869-b5f8-43b9cac8e203, nanoTime: 311179321467600
2022-03-09 15:24:32.362 INFO 12536 --- [pool-1-thread-1] com.example.consumer.QueueTask : started QueueTask, uuid: a63b814f-2016-4b1a-b17b-d870e4b38c64, nanoTime: 311179322025300
2022-03-09 15:24:32.362 INFO 12536 --- [pool-1-thread-1] com.example.consumer.QueueTask : started QueueTask, uuid: 17879b1f-96ed-4236-9902-ff98fc772b5a, nanoTime: 311179322376100
我不明白这是怎么回事。我有一个线程被安排为每 10 毫秒 运行 并且有时它 运行s 在同一毫秒。顺便说一下，它并不是每 10 毫秒 运行，据我所知，调度程序不可能 100% 准确，但它不应该这样做。我也尝试在线程池中使用多个线程，但没有帮助。
你可以看到使用System.nanoTime()打印的纳秒在日志之间是不同的，但是第一个和第二个日志之间的差异是：350800纳秒，即0.3508毫秒。所以这意味着任务不是 运行 间隔 10 毫秒。
请注意，Java 文档中提到的 executorService.scheduleAtFixedRate() 会将任务提交给线程，这并不意味着线程会在给定的时间内准确执行任务。
而且你不能保证任务的执行时间，第一个任务可能超过10毫秒，然后小于10毫秒。
所以你每10毫秒就会有一个新任务提交给你的单线程，这些任务的执行时间不固定，可能多于或少于10毫秒，所以任务数在任务池将超过执行的任务，您的线程将尝试打印所有这些任务，这就是为什么您看到它在那里同时打印的原因。无法保证输出结果，您不能指望您的情况，这还取决于您的机器和线程调度程序。
Java 方法的文档 scheduleAtFixedRate:
Submits a periodic action that becomes enabled first after the given
initial delay, and subsequently with the given period; that is,
executions will commence after initialDelay, then initialDelay +
period, then initialDelay + 2 * period, and so on.
短运行补长运行
我编写了一些代码来试验调度。
我看到的是一些 运行 太短（不到 10 毫秒）以弥补一些太长（超过 10 毫秒）的 运行。
对于我 运行 的每 100 次迭代，我得到大约一半不到 10 毫秒，大约一半超过 10 毫秒，总平均值非常接近 10 毫秒。例如，如果 100 次迭代中有 47 次 运行 长，则有 53 次 运行 短。如果 46 长，则 54 短，依此类推。细读结果数据时，似乎 long-short 运行 是交错的。
考虑到 ScheduledExecutorService#scheduleAtFixedRate 的文档，这个结果是有道理的。如果您要求 10 毫秒的增量，该服务会努力达到自开始以来每 10 毫秒的目标， 而不是 自上次迭代完成后的 10 毫秒。这种努力包括通过缩短其他时间来补偿较长的 运行。
但也许我错了。要么是我的代码有问题，要么是我的推理。请根据需要指正。
package work.basil.threading;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
public class TenMs
{
public static void main ( String[] args )
{
// Setup experiment.
System.out.println( "INFO - Demo start. " + System.nanoTime() );
final int runDemoForMilliseconds = 1000;
final int iterationMillis = 10;
final int initialCapacity = ( runDemoForMilliseconds / iterationMillis ) + 2;
final AtomicLong momentOfExecution = new AtomicLong( System.nanoTime() );
record Moment( long then , long now , long elapsed )
{
@Override
public String toString ( )
{
return "Moment[" + String.join( "|" , "then=" , Long.toString( this.then ) , "now=" , Long.toString( this.now ) , "elapsed=" , Long.toString( this.elapsed ) ,
"elapsed ms = " + TimeUnit.MILLISECONDS.convert( this.elapsed , TimeUnit.NANOSECONDS ) ) + "]";
}
}
final List < Moment > moments = new ArrayList <>( initialCapacity );
final Runnable task = ( ) -> {
long then = momentOfExecution.getAndSet( System.nanoTime() );
long now = momentOfExecution.get();
moments.add( new Moment( then , now , ( now - then ) ) );
//try { Thread.sleep( 5 ); } catch ( InterruptedException e ) { throw new RuntimeException( e ); }
};
// Run experiment.
final ScheduledExecutorService ses = Executors.newSingleThreadScheduledExecutor();
ses.scheduleAtFixedRate( task , 0 , 10 , TimeUnit.MILLISECONDS );
//ses.scheduleWithFixedDelay( task , 0 , 10 , TimeUnit.MILLISECONDS );
try { Thread.sleep( runDemoForMilliseconds ); } catch ( InterruptedException e ) { throw new RuntimeException( e ); }
ses.shutdownNow();
try { ses.awaitTermination( runDemoForMilliseconds * 2 , TimeUnit.MILLISECONDS ); }catch ( InterruptedException e ) { throw new RuntimeException( e ); }
// Analyze results of experiment.
moments.remove( 0 ); // Discard first run, as it involves the startup code's delay.
long averageElapsedNanos = ( long ) moments.stream().mapToLong( Moment :: elapsed ).average().orElse( - 666d );
long averageElapsedMillis = TimeUnit.MILLISECONDS.convert( averageElapsedNanos , TimeUnit.NANOSECONDS );
System.out.println( "averageElapsedNanos = " + averageElapsedNanos );
System.out.println( "averageElapsedMillis = " + averageElapsedMillis );
List < Moment > under10ms = moments.stream().filter( moment -> moment.elapsed < TimeUnit.NANOSECONDS.convert( 10 , TimeUnit.MILLISECONDS ) ).toList();
List < Moment > exactly10ms = moments.stream().filter( moment -> moment.elapsed == TimeUnit.NANOSECONDS.convert( 10 , TimeUnit.MILLISECONDS ) ).toList();
List < Moment > over10ms = moments.stream().filter( moment -> moment.elapsed > TimeUnit.NANOSECONDS.convert( 10 , TimeUnit.MILLISECONDS ) ).toList();
System.out.println( under10ms.size() + " under 10 ms: " + under10ms );
System.out.println( exactly10ms.size() + " exactly 10 ms: " + exactly10ms );
System.out.println( over10ms.size() + " over 10 ms: " + over10ms );
System.out.println( "moments.size() = " + moments.size() );
System.out.println( "moments = " + moments );
System.out.println( "INFO - Demo end. " + System.nanoTime() );
}
}
当 运行 在 MacBook Pro（13 英寸，M1，2020）上时，M1 Apple Silicon 芯片具有 4 个效率核心和 4 个性能核心，以及 16 GB 内存。从 Java 17.0.2.
上的 IntelliJ 2022.1 EAP 执行
INFO - Demo start. 162867211907750
averageElapsedNanos = 10009907
averageElapsedMillis = 10
54 under 10 ms: [Moment[then=|162867232777375|now=|162867242202833|elapsed=|9425458|elapsed ms = 9], Moment[then=|162867252876333|now=|162867262335291|elapsed=|9458958|elapsed ms = 9], Moment[then=|162867262335291|now=|162867270992458|elapsed=|8657167|elapsed ms = 8], Moment[then=|162867283166791|now=|162867292620625|elapsed=|9453834|elapsed ms = 9], Moment[then=|162867292620625|now=|162867301683791|elapsed=|9063166|elapsed ms = 9], Moment[then=|162867313011041|now=|162867322679541|elapsed=|9668500|elapsed ms = 9], Moment[then=|162867342782791|now=|162867352760333|elapsed=|9977542|elapsed ms = 9], Moment[then=|162867372793958|now=|162867382731083|elapsed=|9937125|elapsed ms = 9], Moment[then=|162867392778750|now=|162867402749458|elapsed=|9970708|elapsed ms = 9], Moment[then=|162867402749458|now=|162867412179000|elapsed=|9429542|elapsed ms = 9], Moment[then=|162867422922208|now=|162867432750083|elapsed=|9827875|elapsed ms = 9], Moment[then=|162867452829250|now=|162867462773791|elapsed=|9944541|elapsed ms = 9], Moment[then=|162867462773791|now=|162867472772250|elapsed=|9998459|elapsed ms = 9], Moment[then=|162867472772250|now=|162867482735583|elapsed=|9963333|elapsed ms = 9], Moment[then=|162867492755833|now=|162867502739958|elapsed=|9984125|elapsed ms = 9], Moment[then=|162867522892250|now=|162867532706291|elapsed=|9814041|elapsed ms = 9], Moment[then=|162867532706291|now=|162867542669250|elapsed=|9962959|elapsed ms = 9], Moment[then=|162867552836500|now=|162867562807916|elapsed=|9971416|elapsed ms = 9], Moment[then=|162867562807916|now=|162867572736458|elapsed=|9928542|elapsed ms = 9], Moment[then=|162867572736458|now=|162867581052458|elapsed=|8316000|elapsed ms = 8], Moment[then=|162867593213708|now=|162867601604291|elapsed=|8390583|elapsed ms = 8], Moment[then=|162867613152250|now=|162867622672250|elapsed=|9520000|elapsed ms = 9], Moment[then=|162867632754041|now=|162867642711791|elapsed=|9957750|elapsed ms = 9], Moment[then=|162867652745125|now=|162867660950750|elapsed=|8205625|elapsed ms = 8], Moment[then=|162867673205416|now=|162867682648458|elapsed=|9443042|elapsed ms = 9], Moment[then=|162867702750208|now=|162867712719166|elapsed=|9968958|elapsed ms = 9], Moment[then=|162867722770291|now=|162867732742083|elapsed=|9971792|elapsed ms = 9], Moment[then=|162867742745750|now=|162867752721166|elapsed=|9975416|elapsed ms = 9], Moment[then=|162867752721166|now=|162867762038083|elapsed=|9316917|elapsed ms = 9], Moment[then=|162867772938291|now=|162867782701208|elapsed=|9762917|elapsed ms = 9], Moment[then=|162867792819250|now=|162867802733958|elapsed=|9914708|elapsed ms = 9], Moment[then=|162867812754916|now=|162867822730166|elapsed=|9975250|elapsed ms = 9], Moment[then=|162867852834958|now=|162867862754000|elapsed=|9919042|elapsed ms = 9], Moment[then=|162867872797875|now=|162867882771166|elapsed=|9973291|elapsed ms = 9], Moment[then=|162867882771166|now=|162867892719333|elapsed=|9948167|elapsed ms = 9], Moment[then=|162867892719333|now=|162867901537291|elapsed=|8817958|elapsed ms = 8], Moment[then=|162867913086583|now=|162867922725166|elapsed=|9638583|elapsed ms = 9], Moment[then=|162867932766916|now=|162867942723708|elapsed=|9956792|elapsed ms = 9], Moment[then=|162867942723708|now=|162867950987166|elapsed=|8263458|elapsed ms = 8], Moment[then=|162867963205000|now=|162867972662291|elapsed=|9457291|elapsed ms = 9], Moment[then=|162868002963166|now=|162868011406875|elapsed=|8443709|elapsed ms = 8], Moment[then=|162868023188125|now=|162868031231500|elapsed=|8043375|elapsed ms = 8], Moment[then=|162868043275291|now=|162868052630166|elapsed=|9354875|elapsed ms = 9], Moment[then=|162868062829125|now=|162868072762000|elapsed=|9932875|elapsed ms = 9], Moment[then=|162868082837791|now=|162868092819500|elapsed=|9981709|elapsed ms = 9], Moment[then=|162868092819500|now=|162868102766750|elapsed=|9947250|elapsed ms = 9], Moment[then=|162868112903958|now=|162868121689041|elapsed=|8785083|elapsed ms = 8], Moment[then=|162868133048041|now=|162868142725875|elapsed=|9677834|elapsed ms = 9], Moment[then=|162868142725875|now=|162868151383958|elapsed=|8658083|elapsed ms = 8], Moment[then=|162868163148958|now=|162868172674750|elapsed=|9525792|elapsed ms = 9], Moment[then=|162868182812916|now=|162868192789250|elapsed=|9976334|elapsed ms = 9], Moment[then=|162868192789250|now=|162868202785916|elapsed=|9996666|elapsed ms = 9], Moment[then=|162868202785916|now=|162868212745625|elapsed=|9959709|elapsed ms = 9], Moment[then=|162868212745625|now=|162868222741375|elapsed=|9995750|elapsed ms = 9]]
0 exactly 10 ms: []
46 over 10 ms: [Moment[then=|162867221750666|now=|162867232777375|elapsed=|11026709|elapsed ms = 11], Moment[then=|162867242202833|now=|162867252876333|elapsed=|10673500|elapsed ms = 10], Moment[then=|162867270992458|now=|162867283166791|elapsed=|12174333|elapsed ms = 12], Moment[then=|162867301683791|now=|162867313011041|elapsed=|11327250|elapsed ms = 11], Moment[then=|162867322679541|now=|162867332759166|elapsed=|10079625|elapsed ms = 10], Moment[then=|162867332759166|now=|162867342782791|elapsed=|10023625|elapsed ms = 10], Moment[then=|162867352760333|now=|162867362760500|elapsed=|10000167|elapsed ms = 10], Moment[then=|162867362760500|now=|162867372793958|elapsed=|10033458|elapsed ms = 10], Moment[then=|162867382731083|now=|162867392778750|elapsed=|10047667|elapsed ms = 10], Moment[then=|162867412179000|now=|162867422922208|elapsed=|10743208|elapsed ms = 10], Moment[then=|162867432750083|now=|162867442783500|elapsed=|10033417|elapsed ms = 10], Moment[then=|162867442783500|now=|162867452829250|elapsed=|10045750|elapsed ms = 10], Moment[then=|162867482735583|now=|162867492755833|elapsed=|10020250|elapsed ms = 10], Moment[then=|162867502739958|now=|162867512789125|elapsed=|10049167|elapsed ms = 10], Moment[then=|162867512789125|now=|162867522892250|elapsed=|10103125|elapsed ms = 10], Moment[then=|162867542669250|now=|162867552836500|elapsed=|10167250|elapsed ms = 10], Moment[then=|162867581052458|now=|162867593213708|elapsed=|12161250|elapsed ms = 12], Moment[then=|162867601604291|now=|162867613152250|elapsed=|11547959|elapsed ms = 11], Moment[then=|162867622672250|now=|162867632754041|elapsed=|10081791|elapsed ms = 10], Moment[then=|162867642711791|now=|162867652745125|elapsed=|10033334|elapsed ms = 10], Moment[then=|162867660950750|now=|162867673205416|elapsed=|12254666|elapsed ms = 12], Moment[then=|162867682648458|now=|162867692740291|elapsed=|10091833|elapsed ms = 10], Moment[then=|162867692740291|now=|162867702750208|elapsed=|10009917|elapsed ms = 10], Moment[then=|162867712719166|now=|162867722770291|elapsed=|10051125|elapsed ms = 10], Moment[then=|162867732742083|now=|162867742745750|elapsed=|10003667|elapsed ms = 10], Moment[then=|162867762038083|now=|162867772938291|elapsed=|10900208|elapsed ms = 10], Moment[then=|162867782701208|now=|162867792819250|elapsed=|10118042|elapsed ms = 10], Moment[then=|162867802733958|now=|162867812754916|elapsed=|10020958|elapsed ms = 10], Moment[then=|162867822730166|now=|162867832762791|elapsed=|10032625|elapsed ms = 10], Moment[then=|162867832762791|now=|162867842782541|elapsed=|10019750|elapsed ms = 10], Moment[then=|162867842782541|now=|162867852834958|elapsed=|10052417|elapsed ms = 10], Moment[then=|162867862754000|now=|162867872797875|elapsed=|10043875|elapsed ms = 10], Moment[then=|162867901537291|now=|162867913086583|elapsed=|11549292|elapsed ms = 11], Moment[then=|162867922725166|now=|162867932766916|elapsed=|10041750|elapsed ms = 10], Moment[then=|162867950987166|now=|162867963205000|elapsed=|12217834|elapsed ms = 12], Moment[then=|162867972662291|now=|162867982797833|elapsed=|10135542|elapsed ms = 10], Moment[then=|162867982797833|now=|162867992885583|elapsed=|10087750|elapsed ms = 10], Moment[then=|162867992885583|now=|162868002963166|elapsed=|10077583|elapsed ms = 10], Moment[then=|162868011406875|now=|162868023188125|elapsed=|11781250|elapsed ms = 11], Moment[then=|162868031231500|now=|162868043275291|elapsed=|12043791|elapsed ms = 12], Moment[then=|162868052630166|now=|162868062829125|elapsed=|10198959|elapsed ms = 10], Moment[then=|162868072762000|now=|162868082837791|elapsed=|10075791|elapsed ms = 10], Moment[then=|162868102766750|now=|162868112903958|elapsed=|10137208|elapsed ms = 10], Moment[then=|162868121689041|now=|162868133048041|elapsed=|11359000|elapsed ms = 11], Moment[then=|162868151383958|now=|162868163148958|elapsed=|11765000|elapsed ms = 11], Moment[then=|162868172674750|now=|162868182812916|elapsed=|10138166|elapsed ms = 10]]
moments.size() = 100
moments = [Moment[then=|162867221750666|now=|162867232777375|elapsed=|11026709|elapsed ms = 11], Moment[then=|162867232777375|now=|162867242202833|elapsed=|9425458|elapsed ms = 9], Moment[then=|162867242202833|now=|162867252876333|elapsed=|10673500|elapsed ms = 10], Moment[then=|162867252876333|now=|162867262335291|elapsed=|9458958|elapsed ms = 9], Moment[then=|162867262335291|now=|162867270992458|elapsed=|8657167|elapsed ms = 8], Moment[then=|162867270992458|now=|162867283166791|elapsed=|12174333|elapsed ms = 12], Moment[then=|162867283166791|now=|162867292620625|elapsed=|9453834|elapsed ms = 9], Moment[then=|162867292620625|now=|162867301683791|elapsed=|9063166|elapsed ms = 9], Moment[then=|162867301683791|now=|162867313011041|elapsed=|11327250|elapsed ms = 11], Moment[then=|162867313011041|now=|162867322679541|elapsed=|9668500|elapsed ms = 9], Moment[then=|162867322679541|now=|162867332759166|elapsed=|10079625|elapsed ms = 10], Moment[then=|162867332759166|now=|162867342782791|elapsed=|10023625|elapsed ms = 10], Moment[then=|162867342782791|now=|162867352760333|elapsed=|9977542|elapsed ms = 9], Moment[then=|162867352760333|now=|162867362760500|elapsed=|10000167|elapsed ms = 10], Moment[then=|162867362760500|now=|162867372793958|elapsed=|10033458|elapsed ms = 10], Moment[then=|162867372793958|now=|162867382731083|elapsed=|9937125|elapsed ms = 9], Moment[then=|162867382731083|now=|162867392778750|elapsed=|10047667|elapsed ms = 10], Moment[then=|162867392778750|now=|162867402749458|elapsed=|9970708|elapsed ms = 9], Moment[then=|162867402749458|now=|162867412179000|elapsed=|9429542|elapsed ms = 9], Moment[then=|162867412179000|now=|162867422922208|elapsed=|10743208|elapsed ms = 10], Moment[then=|162867422922208|now=|162867432750083|elapsed=|9827875|elapsed ms = 9], Moment[then=|162867432750083|now=|162867442783500|elapsed=|10033417|elapsed ms = 10], Moment[then=|162867442783500|now=|162867452829250|elapsed=|10045750|elapsed ms = 10], Moment[then=|162867452829250|now=|162867462773791|elapsed=|9944541|elapsed ms = 9], Moment[then=|162867462773791|now=|162867472772250|elapsed=|9998459|elapsed ms = 9], Moment[then=|162867472772250|now=|162867482735583|elapsed=|9963333|elapsed ms = 9], Moment[then=|162867482735583|now=|162867492755833|elapsed=|10020250|elapsed ms = 10], Moment[then=|162867492755833|now=|162867502739958|elapsed=|9984125|elapsed ms = 9], Moment[then=|162867502739958|now=|162867512789125|elapsed=|10049167|elapsed ms = 10], Moment[then=|162867512789125|now=|162867522892250|elapsed=|10103125|elapsed ms = 10], Moment[then=|162867522892250|now=|162867532706291|elapsed=|9814041|elapsed ms = 9], Moment[then=|162867532706291|now=|162867542669250|elapsed=|9962959|elapsed ms = 9], Moment[then=|162867542669250|now=|162867552836500|elapsed=|10167250|elapsed ms = 10], Moment[then=|162867552836500|now=|162867562807916|elapsed=|9971416|elapsed ms = 9], Moment[then=|162867562807916|now=|162867572736458|elapsed=|9928542|elapsed ms = 9], Moment[then=|162867572736458|now=|162867581052458|elapsed=|8316000|elapsed ms = 8], Moment[then=|162867581052458|now=|162867593213708|elapsed=|12161250|elapsed ms = 12], Moment[then=|162867593213708|now=|162867601604291|elapsed=|8390583|elapsed ms = 8], Moment[then=|162867601604291|now=|162867613152250|elapsed=|11547959|elapsed ms = 11], Moment[then=|162867613152250|now=|162867622672250|elapsed=|9520000|elapsed ms = 9], Moment[then=|162867622672250|now=|162867632754041|elapsed=|10081791|elapsed ms = 10], Moment[then=|162867632754041|now=|162867642711791|elapsed=|9957750|elapsed ms = 9], Moment[then=|162867642711791|now=|162867652745125|elapsed=|10033334|elapsed ms = 10], Moment[then=|162867652745125|now=|162867660950750|elapsed=|8205625|elapsed ms = 8], Moment[then=|162867660950750|now=|162867673205416|elapsed=|12254666|elapsed ms = 12], Moment[then=|162867673205416|now=|162867682648458|elapsed=|9443042|elapsed ms = 9], Moment[then=|162867682648458|now=|162867692740291|elapsed=|10091833|elapsed ms = 10], Moment[then=|162867692740291|now=|162867702750208|elapsed=|10009917|elapsed ms = 10], Moment[then=|162867702750208|now=|162867712719166|elapsed=|9968958|elapsed ms = 9], Moment[then=|162867712719166|now=|162867722770291|elapsed=|10051125|elapsed ms = 10], Moment[then=|162867722770291|now=|162867732742083|elapsed=|9971792|elapsed ms = 9], Moment[then=|162867732742083|now=|162867742745750|elapsed=|10003667|elapsed ms = 10], Moment[then=|162867742745750|now=|162867752721166|elapsed=|9975416|elapsed ms = 9], Moment[then=|162867752721166|now=|162867762038083|elapsed=|9316917|elapsed ms = 9], Moment[then=|162867762038083|now=|162867772938291|elapsed=|10900208|elapsed ms = 10], Moment[then=|162867772938291|now=|162867782701208|elapsed=|9762917|elapsed ms = 9], Moment[then=|162867782701208|now=|162867792819250|elapsed=|10118042|elapsed ms = 10], Moment[then=|162867792819250|now=|162867802733958|elapsed=|9914708|elapsed ms = 9], Moment[then=|162867802733958|now=|162867812754916|elapsed=|10020958|elapsed ms = 10], Moment[then=|162867812754916|now=|162867822730166|elapsed=|9975250|elapsed ms = 9], Moment[then=|162867822730166|now=|162867832762791|elapsed=|10032625|elapsed ms = 10], Moment[then=|162867832762791|now=|162867842782541|elapsed=|10019750|elapsed ms = 10], Moment[then=|162867842782541|now=|162867852834958|elapsed=|10052417|elapsed ms = 10], Moment[then=|162867852834958|now=|162867862754000|elapsed=|9919042|elapsed ms = 9], Moment[then=|162867862754000|now=|162867872797875|elapsed=|10043875|elapsed ms = 10], Moment[then=|162867872797875|now=|162867882771166|elapsed=|9973291|elapsed ms = 9], Moment[then=|162867882771166|now=|162867892719333|elapsed=|9948167|elapsed ms = 9], Moment[then=|162867892719333|now=|162867901537291|elapsed=|8817958|elapsed ms = 8], Moment[then=|162867901537291|now=|162867913086583|elapsed=|11549292|elapsed ms = 11], Moment[then=|162867913086583|now=|162867922725166|elapsed=|9638583|elapsed ms = 9], Moment[then=|162867922725166|now=|162867932766916|elapsed=|10041750|elapsed ms = 10], Moment[then=|162867932766916|now=|162867942723708|elapsed=|9956792|elapsed ms = 9], Moment[then=|162867942723708|now=|162867950987166|elapsed=|8263458|elapsed ms = 8], Moment[then=|162867950987166|now=|162867963205000|elapsed=|12217834|elapsed ms = 12], Moment[then=|162867963205000|now=|162867972662291|elapsed=|9457291|elapsed ms = 9], Moment[then=|162867972662291|now=|162867982797833|elapsed=|10135542|elapsed ms = 10], Moment[then=|162867982797833|now=|162867992885583|elapsed=|10087750|elapsed ms = 10], Moment[then=|162867992885583|now=|162868002963166|elapsed=|10077583|elapsed ms = 10], Moment[then=|162868002963166|now=|162868011406875|elapsed=|8443709|elapsed ms = 8], Moment[then=|162868011406875|now=|162868023188125|elapsed=|11781250|elapsed ms = 11], Moment[then=|162868023188125|now=|162868031231500|elapsed=|8043375|elapsed ms = 8], Moment[then=|162868031231500|now=|162868043275291|elapsed=|12043791|elapsed ms = 12], Moment[then=|162868043275291|now=|162868052630166|elapsed=|9354875|elapsed ms = 9], Moment[then=|162868052630166|now=|162868062829125|elapsed=|10198959|elapsed ms = 10], Moment[then=|162868062829125|now=|162868072762000|elapsed=|9932875|elapsed ms = 9], Moment[then=|162868072762000|now=|162868082837791|elapsed=|10075791|elapsed ms = 10], Moment[then=|162868082837791|now=|162868092819500|elapsed=|9981709|elapsed ms = 9], Moment[then=|162868092819500|now=|162868102766750|elapsed=|9947250|elapsed ms = 9], Moment[then=|162868102766750|now=|162868112903958|elapsed=|10137208|elapsed ms = 10], Moment[then=|162868112903958|now=|162868121689041|elapsed=|8785083|elapsed ms = 8], Moment[then=|162868121689041|now=|162868133048041|elapsed=|11359000|elapsed ms = 11], Moment[then=|162868133048041|now=|162868142725875|elapsed=|9677834|elapsed ms = 9], Moment[then=|162868142725875|now=|162868151383958|elapsed=|8658083|elapsed ms = 8], Moment[then=|162868151383958|now=|162868163148958|elapsed=|11765000|elapsed ms = 11], Moment[then=|162868163148958|now=|162868172674750|elapsed=|9525792|elapsed ms = 9], Moment[then=|162868172674750|now=|162868182812916|elapsed=|10138166|elapsed ms = 10], Moment[then=|162868182812916|now=|162868192789250|elapsed=|9976334|elapsed ms = 9], Moment[then=|162868192789250|now=|162868202785916|elapsed=|9996666|elapsed ms = 9], Moment[then=|162868202785916|now=|162868212745625|elapsed=|9959709|elapsed ms = 9], Moment[then=|162868212745625|now=|162868222741375|elapsed=|9995750|elapsed ms = 9]]
INFO - Demo end. 162868252016666
我有一个 Java 项目 (Java 8)，它应该每 10 毫秒执行一次任务。我使用 java ScheduledExecutorService 来 运行 任务：
ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
executorService.scheduleAtFixedRate(new QueueTask(), 0, 10, TimeUnit.MILLISECONDS);
QueueTask 扩展 Runnable 并从队列中轮询 - 不超过 10 毫秒。 QueueTask 的每个 运行 我都会记录“已启动的 QueueTask”。
出于某种原因，根据日志，任务 运行ning 在同一毫秒，我不明白为什么。例如：
2022-03-09 15:24:32.362 INFO 12536 --- [pool-1-thread-1] com.example.consumer.QueueTask : started QueueTask, uuid: 40bf7e61-66f3-4869-b5f8-43b9cac8e203, nanoTime: 311179321467600
2022-03-09 15:24:32.362 INFO 12536 --- [pool-1-thread-1] com.example.consumer.QueueTask : started QueueTask, uuid: a63b814f-2016-4b1a-b17b-d870e4b38c64, nanoTime: 311179322025300
2022-03-09 15:24:32.362 INFO 12536 --- [pool-1-thread-1] com.example.consumer.QueueTask : started QueueTask, uuid: 17879b1f-96ed-4236-9902-ff98fc772b5a, nanoTime: 311179322376100
我不明白这是怎么回事。我有一个线程被安排为每 10 毫秒 运行 并且有时它 运行s 在同一毫秒。顺便说一下，它并不是每 10 毫秒 运行，据我所知，调度程序不可能 100% 准确，但它不应该这样做。我也尝试在线程池中使用多个线程，但没有帮助。
你可以看到使用System.nanoTime()打印的纳秒在日志之间是不同的，但是第一个和第二个日志之间的差异是：350800纳秒，即0.3508毫秒。所以这意味着任务不是 运行 间隔 10 毫秒。
请注意，Java 文档中提到的 executorService.scheduleAtFixedRate() 会将任务提交给线程，这并不意味着线程会在给定的时间内准确执行任务。
而且你不能保证任务的执行时间，第一个任务可能超过10毫秒，然后小于10毫秒。
所以你每10毫秒就会有一个新任务提交给你的单线程，这些任务的执行时间不固定，可能多于或少于10毫秒，所以任务数在任务池将超过执行的任务，您的线程将尝试打印所有这些任务，这就是为什么您看到它在那里同时打印的原因。无法保证输出结果，您不能指望您的情况，这还取决于您的机器和线程调度程序。
Java 方法的文档 scheduleAtFixedRate:
Submits a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that is, executions will commence after initialDelay, then initialDelay + period, then initialDelay + 2 * period, and so on.
短运行补长运行
我编写了一些代码来试验调度。
我看到的是一些 运行 太短（不到 10 毫秒）以弥补一些太长（超过 10 毫秒）的 运行。
对于我 运行 的每 100 次迭代，我得到大约一半不到 10 毫秒，大约一半超过 10 毫秒，总平均值非常接近 10 毫秒。例如，如果 100 次迭代中有 47 次 运行 长，则有 53 次 运行 短。如果 46 长，则 54 短，依此类推。细读结果数据时，似乎 long-short 运行 是交错的。
考虑到 ScheduledExecutorService#scheduleAtFixedRate 的文档，这个结果是有道理的。如果您要求 10 毫秒的增量，该服务会努力达到自开始以来每 10 毫秒的目标， 而不是 自上次迭代完成后的 10 毫秒。这种努力包括通过缩短其他时间来补偿较长的 运行。
但也许我错了。要么是我的代码有问题，要么是我的推理。请根据需要指正。
package work.basil.threading;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
public class TenMs
{
public static void main ( String[] args )
{
// Setup experiment.
System.out.println( "INFO - Demo start. " + System.nanoTime() );
final int runDemoForMilliseconds = 1000;
final int iterationMillis = 10;
final int initialCapacity = ( runDemoForMilliseconds / iterationMillis ) + 2;
final AtomicLong momentOfExecution = new AtomicLong( System.nanoTime() );
record Moment( long then , long now , long elapsed )
{
@Override
public String toString ( )
{
return "Moment[" + String.join( "|" , "then=" , Long.toString( this.then ) , "now=" , Long.toString( this.now ) , "elapsed=" , Long.toString( this.elapsed ) ,
"elapsed ms = " + TimeUnit.MILLISECONDS.convert( this.elapsed , TimeUnit.NANOSECONDS ) ) + "]";
}
}
final List < Moment > moments = new ArrayList <>( initialCapacity );
final Runnable task = ( ) -> {
long then = momentOfExecution.getAndSet( System.nanoTime() );
long now = momentOfExecution.get();
moments.add( new Moment( then , now , ( now - then ) ) );
//try { Thread.sleep( 5 ); } catch ( InterruptedException e ) { throw new RuntimeException( e ); }
};
// Run experiment.
final ScheduledExecutorService ses = Executors.newSingleThreadScheduledExecutor();
ses.scheduleAtFixedRate( task , 0 , 10 , TimeUnit.MILLISECONDS );
//ses.scheduleWithFixedDelay( task , 0 , 10 , TimeUnit.MILLISECONDS );
try { Thread.sleep( runDemoForMilliseconds ); } catch ( InterruptedException e ) { throw new RuntimeException( e ); }
ses.shutdownNow();
try { ses.awaitTermination( runDemoForMilliseconds * 2 , TimeUnit.MILLISECONDS ); }catch ( InterruptedException e ) { throw new RuntimeException( e ); }
// Analyze results of experiment.
moments.remove( 0 ); // Discard first run, as it involves the startup code's delay.
long averageElapsedNanos = ( long ) moments.stream().mapToLong( Moment :: elapsed ).average().orElse( - 666d );
long averageElapsedMillis = TimeUnit.MILLISECONDS.convert( averageElapsedNanos , TimeUnit.NANOSECONDS );
System.out.println( "averageElapsedNanos = " + averageElapsedNanos );
System.out.println( "averageElapsedMillis = " + averageElapsedMillis );
List < Moment > under10ms = moments.stream().filter( moment -> moment.elapsed < TimeUnit.NANOSECONDS.convert( 10 , TimeUnit.MILLISECONDS ) ).toList();
List < Moment > exactly10ms = moments.stream().filter( moment -> moment.elapsed == TimeUnit.NANOSECONDS.convert( 10 , TimeUnit.MILLISECONDS ) ).toList();
List < Moment > over10ms = moments.stream().filter( moment -> moment.elapsed > TimeUnit.NANOSECONDS.convert( 10 , TimeUnit.MILLISECONDS ) ).toList();
System.out.println( under10ms.size() + " under 10 ms: " + under10ms );
System.out.println( exactly10ms.size() + " exactly 10 ms: " + exactly10ms );
System.out.println( over10ms.size() + " over 10 ms: " + over10ms );
System.out.println( "moments.size() = " + moments.size() );
System.out.println( "moments = " + moments );
System.out.println( "INFO - Demo end. " + System.nanoTime() );
}
}
当 运行 在 MacBook Pro（13 英寸，M1，2020）上时，M1 Apple Silicon 芯片具有 4 个效率核心和 4 个性能核心，以及 16 GB 内存。从 Java 17.0.2.
上的 IntelliJ 2022.1 EAP 执行INFO - Demo start. 162867211907750
averageElapsedNanos = 10009907
averageElapsedMillis = 10
54 under 10 ms: [Moment[then=|162867232777375|now=|162867242202833|elapsed=|9425458|elapsed ms = 9], Moment[then=|162867252876333|now=|162867262335291|elapsed=|9458958|elapsed ms = 9], Moment[then=|162867262335291|now=|162867270992458|elapsed=|8657167|elapsed ms = 8], Moment[then=|162867283166791|now=|162867292620625|elapsed=|9453834|elapsed ms = 9], Moment[then=|162867292620625|now=|162867301683791|elapsed=|9063166|elapsed ms = 9], Moment[then=|162867313011041|now=|162867322679541|elapsed=|9668500|elapsed ms = 9], Moment[then=|162867342782791|now=|162867352760333|elapsed=|9977542|elapsed ms = 9], Moment[then=|162867372793958|now=|162867382731083|elapsed=|9937125|elapsed ms = 9], Moment[then=|162867392778750|now=|162867402749458|elapsed=|9970708|elapsed ms = 9], Moment[then=|162867402749458|now=|162867412179000|elapsed=|9429542|elapsed ms = 9], Moment[then=|162867422922208|now=|162867432750083|elapsed=|9827875|elapsed ms = 9], Moment[then=|162867452829250|now=|162867462773791|elapsed=|9944541|elapsed ms = 9], Moment[then=|162867462773791|now=|162867472772250|elapsed=|9998459|elapsed ms = 9], Moment[then=|162867472772250|now=|162867482735583|elapsed=|9963333|elapsed ms = 9], Moment[then=|162867492755833|now=|162867502739958|elapsed=|9984125|elapsed ms = 9], Moment[then=|162867522892250|now=|162867532706291|elapsed=|9814041|elapsed ms = 9], Moment[then=|162867532706291|now=|162867542669250|elapsed=|9962959|elapsed ms = 9], Moment[then=|162867552836500|now=|162867562807916|elapsed=|9971416|elapsed ms = 9], Moment[then=|162867562807916|now=|162867572736458|elapsed=|9928542|elapsed ms = 9], Moment[then=|162867572736458|now=|162867581052458|elapsed=|8316000|elapsed ms = 8], Moment[then=|162867593213708|now=|162867601604291|elapsed=|8390583|elapsed ms = 8], Moment[then=|162867613152250|now=|162867622672250|elapsed=|9520000|elapsed ms = 9], Moment[then=|162867632754041|now=|162867642711791|elapsed=|9957750|elapsed ms = 9], Moment[then=|162867652745125|now=|162867660950750|elapsed=|8205625|elapsed ms = 8], Moment[then=|162867673205416|now=|162867682648458|elapsed=|9443042|elapsed ms = 9], Moment[then=|162867702750208|now=|162867712719166|elapsed=|9968958|elapsed ms = 9], Moment[then=|162867722770291|now=|162867732742083|elapsed=|9971792|elapsed ms = 9], Moment[then=|162867742745750|now=|162867752721166|elapsed=|9975416|elapsed ms = 9], Moment[then=|162867752721166|now=|162867762038083|elapsed=|9316917|elapsed ms = 9], Moment[then=|162867772938291|now=|162867782701208|elapsed=|9762917|elapsed ms = 9], Moment[then=|162867792819250|now=|162867802733958|elapsed=|9914708|elapsed ms = 9], Moment[then=|162867812754916|now=|162867822730166|elapsed=|9975250|elapsed ms = 9], Moment[then=|162867852834958|now=|162867862754000|elapsed=|9919042|elapsed ms = 9], Moment[then=|162867872797875|now=|162867882771166|elapsed=|9973291|elapsed ms = 9], Moment[then=|162867882771166|now=|162867892719333|elapsed=|9948167|elapsed ms = 9], Moment[then=|162867892719333|now=|162867901537291|elapsed=|8817958|elapsed ms = 8], Moment[then=|162867913086583|now=|162867922725166|elapsed=|9638583|elapsed ms = 9], Moment[then=|162867932766916|now=|162867942723708|elapsed=|9956792|elapsed ms = 9], Moment[then=|162867942723708|now=|162867950987166|elapsed=|8263458|elapsed ms = 8], Moment[then=|162867963205000|now=|162867972662291|elapsed=|9457291|elapsed ms = 9], Moment[then=|162868002963166|now=|162868011406875|elapsed=|8443709|elapsed ms = 8], Moment[then=|162868023188125|now=|162868031231500|elapsed=|8043375|elapsed ms = 8], Moment[then=|162868043275291|now=|162868052630166|elapsed=|9354875|elapsed ms = 9], Moment[then=|162868062829125|now=|162868072762000|elapsed=|9932875|elapsed ms = 9], Moment[then=|162868082837791|now=|162868092819500|elapsed=|9981709|elapsed ms = 9], Moment[then=|162868092819500|now=|162868102766750|elapsed=|9947250|elapsed ms = 9], Moment[then=|162868112903958|now=|162868121689041|elapsed=|8785083|elapsed ms = 8], Moment[then=|162868133048041|now=|162868142725875|elapsed=|9677834|elapsed ms = 9], Moment[then=|162868142725875|now=|162868151383958|elapsed=|8658083|elapsed ms = 8], Moment[then=|162868163148958|now=|162868172674750|elapsed=|9525792|elapsed ms = 9], Moment[then=|162868182812916|now=|162868192789250|elapsed=|9976334|elapsed ms = 9], Moment[then=|162868192789250|now=|162868202785916|elapsed=|9996666|elapsed ms = 9], Moment[then=|162868202785916|now=|162868212745625|elapsed=|9959709|elapsed ms = 9], Moment[then=|162868212745625|now=|162868222741375|elapsed=|9995750|elapsed ms = 9]]
0 exactly 10 ms: []
46 over 10 ms: [Moment[then=|162867221750666|now=|162867232777375|elapsed=|11026709|elapsed ms = 11], Moment[then=|162867242202833|now=|162867252876333|elapsed=|10673500|elapsed ms = 10], Moment[then=|162867270992458|now=|162867283166791|elapsed=|12174333|elapsed ms = 12], Moment[then=|162867301683791|now=|162867313011041|elapsed=|11327250|elapsed ms = 11], Moment[then=|162867322679541|now=|162867332759166|elapsed=|10079625|elapsed ms = 10], Moment[then=|162867332759166|now=|162867342782791|elapsed=|10023625|elapsed ms = 10], Moment[then=|162867352760333|now=|162867362760500|elapsed=|10000167|elapsed ms = 10], Moment[then=|162867362760500|now=|162867372793958|elapsed=|10033458|elapsed ms = 10], Moment[then=|162867382731083|now=|162867392778750|elapsed=|10047667|elapsed ms = 10], Moment[then=|162867412179000|now=|162867422922208|elapsed=|10743208|elapsed ms = 10], Moment[then=|162867432750083|now=|162867442783500|elapsed=|10033417|elapsed ms = 10], Moment[then=|162867442783500|now=|162867452829250|elapsed=|10045750|elapsed ms = 10], Moment[then=|162867482735583|now=|162867492755833|elapsed=|10020250|elapsed ms = 10], Moment[then=|162867502739958|now=|162867512789125|elapsed=|10049167|elapsed ms = 10], Moment[then=|162867512789125|now=|162867522892250|elapsed=|10103125|elapsed ms = 10], Moment[then=|162867542669250|now=|162867552836500|elapsed=|10167250|elapsed ms = 10], Moment[then=|162867581052458|now=|162867593213708|elapsed=|12161250|elapsed ms = 12], Moment[then=|162867601604291|now=|162867613152250|elapsed=|11547959|elapsed ms = 11], Moment[then=|162867622672250|now=|162867632754041|elapsed=|10081791|elapsed ms = 10], Moment[then=|162867642711791|now=|162867652745125|elapsed=|10033334|elapsed ms = 10], Moment[then=|162867660950750|now=|162867673205416|elapsed=|12254666|elapsed ms = 12], Moment[then=|162867682648458|now=|162867692740291|elapsed=|10091833|elapsed ms = 10], Moment[then=|162867692740291|now=|162867702750208|elapsed=|10009917|elapsed ms = 10], Moment[then=|162867712719166|now=|162867722770291|elapsed=|10051125|elapsed ms = 10], Moment[then=|162867732742083|now=|162867742745750|elapsed=|10003667|elapsed ms = 10], Moment[then=|162867762038083|now=|162867772938291|elapsed=|10900208|elapsed ms = 10], Moment[then=|162867782701208|now=|162867792819250|elapsed=|10118042|elapsed ms = 10], Moment[then=|162867802733958|now=|162867812754916|elapsed=|10020958|elapsed ms = 10], Moment[then=|162867822730166|now=|162867832762791|elapsed=|10032625|elapsed ms = 10], Moment[then=|162867832762791|now=|162867842782541|elapsed=|10019750|elapsed ms = 10], Moment[then=|162867842782541|now=|162867852834958|elapsed=|10052417|elapsed ms = 10], Moment[then=|162867862754000|now=|162867872797875|elapsed=|10043875|elapsed ms = 10], Moment[then=|162867901537291|now=|162867913086583|elapsed=|11549292|elapsed ms = 11], Moment[then=|162867922725166|now=|162867932766916|elapsed=|10041750|elapsed ms = 10], Moment[then=|162867950987166|now=|162867963205000|elapsed=|12217834|elapsed ms = 12], Moment[then=|162867972662291|now=|162867982797833|elapsed=|10135542|elapsed ms = 10], Moment[then=|162867982797833|now=|162867992885583|elapsed=|10087750|elapsed ms = 10], Moment[then=|162867992885583|now=|162868002963166|elapsed=|10077583|elapsed ms = 10], Moment[then=|162868011406875|now=|162868023188125|elapsed=|11781250|elapsed ms = 11], Moment[then=|162868031231500|now=|162868043275291|elapsed=|12043791|elapsed ms = 12], Moment[then=|162868052630166|now=|162868062829125|elapsed=|10198959|elapsed ms = 10], Moment[then=|162868072762000|now=|162868082837791|elapsed=|10075791|elapsed ms = 10], Moment[then=|162868102766750|now=|162868112903958|elapsed=|10137208|elapsed ms = 10], Moment[then=|162868121689041|now=|162868133048041|elapsed=|11359000|elapsed ms = 11], Moment[then=|162868151383958|now=|162868163148958|elapsed=|11765000|elapsed ms = 11], Moment[then=|162868172674750|now=|162868182812916|elapsed=|10138166|elapsed ms = 10]]
moments.size() = 100
moments = [Moment[then=|162867221750666|now=|162867232777375|elapsed=|11026709|elapsed ms = 11], Moment[then=|162867232777375|now=|162867242202833|elapsed=|9425458|elapsed ms = 9], Moment[then=|162867242202833|now=|162867252876333|elapsed=|10673500|elapsed ms = 10], Moment[then=|162867252876333|now=|162867262335291|elapsed=|9458958|elapsed ms = 9], Moment[then=|162867262335291|now=|162867270992458|elapsed=|8657167|elapsed ms = 8], Moment[then=|162867270992458|now=|162867283166791|elapsed=|12174333|elapsed ms = 12], Moment[then=|162867283166791|now=|162867292620625|elapsed=|9453834|elapsed ms = 9], Moment[then=|162867292620625|now=|162867301683791|elapsed=|9063166|elapsed ms = 9], Moment[then=|162867301683791|now=|162867313011041|elapsed=|11327250|elapsed ms = 11], Moment[then=|162867313011041|now=|162867322679541|elapsed=|9668500|elapsed ms = 9], Moment[then=|162867322679541|now=|162867332759166|elapsed=|10079625|elapsed ms = 10], Moment[then=|162867332759166|now=|162867342782791|elapsed=|10023625|elapsed ms = 10], Moment[then=|162867342782791|now=|162867352760333|elapsed=|9977542|elapsed ms = 9], Moment[then=|162867352760333|now=|162867362760500|elapsed=|10000167|elapsed ms = 10], Moment[then=|162867362760500|now=|162867372793958|elapsed=|10033458|elapsed ms = 10], Moment[then=|162867372793958|now=|162867382731083|elapsed=|9937125|elapsed ms = 9], Moment[then=|162867382731083|now=|162867392778750|elapsed=|10047667|elapsed ms = 10], Moment[then=|162867392778750|now=|162867402749458|elapsed=|9970708|elapsed ms = 9], Moment[then=|162867402749458|now=|162867412179000|elapsed=|9429542|elapsed ms = 9], Moment[then=|162867412179000|now=|162867422922208|elapsed=|10743208|elapsed ms = 10], Moment[then=|162867422922208|now=|162867432750083|elapsed=|9827875|elapsed ms = 9], Moment[then=|162867432750083|now=|162867442783500|elapsed=|10033417|elapsed ms = 10], Moment[then=|162867442783500|now=|162867452829250|elapsed=|10045750|elapsed ms = 10], Moment[then=|162867452829250|now=|162867462773791|elapsed=|9944541|elapsed ms = 9], Moment[then=|162867462773791|now=|162867472772250|elapsed=|9998459|elapsed ms = 9], Moment[then=|162867472772250|now=|162867482735583|elapsed=|9963333|elapsed ms = 9], Moment[then=|162867482735583|now=|162867492755833|elapsed=|10020250|elapsed ms = 10], Moment[then=|162867492755833|now=|162867502739958|elapsed=|9984125|elapsed ms = 9], Moment[then=|162867502739958|now=|162867512789125|elapsed=|10049167|elapsed ms = 10], Moment[then=|162867512789125|now=|162867522892250|elapsed=|10103125|elapsed ms = 10], Moment[then=|162867522892250|now=|162867532706291|elapsed=|9814041|elapsed ms = 9], Moment[then=|162867532706291|now=|162867542669250|elapsed=|9962959|elapsed ms = 9], Moment[then=|162867542669250|now=|162867552836500|elapsed=|10167250|elapsed ms = 10], Moment[then=|162867552836500|now=|162867562807916|elapsed=|9971416|elapsed ms = 9], Moment[then=|162867562807916|now=|162867572736458|elapsed=|9928542|elapsed ms = 9], Moment[then=|162867572736458|now=|162867581052458|elapsed=|8316000|elapsed ms = 8], Moment[then=|162867581052458|now=|162867593213708|elapsed=|12161250|elapsed ms = 12], Moment[then=|162867593213708|now=|162867601604291|elapsed=|8390583|elapsed ms = 8], Moment[then=|162867601604291|now=|162867613152250|elapsed=|11547959|elapsed ms = 11], Moment[then=|162867613152250|now=|162867622672250|elapsed=|9520000|elapsed ms = 9], Moment[then=|162867622672250|now=|162867632754041|elapsed=|10081791|elapsed ms = 10], Moment[then=|162867632754041|now=|162867642711791|elapsed=|9957750|elapsed ms = 9], Moment[then=|162867642711791|now=|162867652745125|elapsed=|10033334|elapsed ms = 10], Moment[then=|162867652745125|now=|162867660950750|elapsed=|8205625|elapsed ms = 8], Moment[then=|162867660950750|now=|162867673205416|elapsed=|12254666|elapsed ms = 12], Moment[then=|162867673205416|now=|162867682648458|elapsed=|9443042|elapsed ms = 9], Moment[then=|162867682648458|now=|162867692740291|elapsed=|10091833|elapsed ms = 10], Moment[then=|162867692740291|now=|162867702750208|elapsed=|10009917|elapsed ms = 10], Moment[then=|162867702750208|now=|162867712719166|elapsed=|9968958|elapsed ms = 9], Moment[then=|162867712719166|now=|162867722770291|elapsed=|10051125|elapsed ms = 10], Moment[then=|162867722770291|now=|162867732742083|elapsed=|9971792|elapsed ms = 9], Moment[then=|162867732742083|now=|162867742745750|elapsed=|10003667|elapsed ms = 10], Moment[then=|162867742745750|now=|162867752721166|elapsed=|9975416|elapsed ms = 9], Moment[then=|162867752721166|now=|162867762038083|elapsed=|9316917|elapsed ms = 9], Moment[then=|162867762038083|now=|162867772938291|elapsed=|10900208|elapsed ms = 10], Moment[then=|162867772938291|now=|162867782701208|elapsed=|9762917|elapsed ms = 9], Moment[then=|162867782701208|now=|162867792819250|elapsed=|10118042|elapsed ms = 10], Moment[then=|162867792819250|now=|162867802733958|elapsed=|9914708|elapsed ms = 9], Moment[then=|162867802733958|now=|162867812754916|elapsed=|10020958|elapsed ms = 10], Moment[then=|162867812754916|now=|162867822730166|elapsed=|9975250|elapsed ms = 9], Moment[then=|162867822730166|now=|162867832762791|elapsed=|10032625|elapsed ms = 10], Moment[then=|162867832762791|now=|162867842782541|elapsed=|10019750|elapsed ms = 10], Moment[then=|162867842782541|now=|162867852834958|elapsed=|10052417|elapsed ms = 10], Moment[then=|162867852834958|now=|162867862754000|elapsed=|9919042|elapsed ms = 9], Moment[then=|162867862754000|now=|162867872797875|elapsed=|10043875|elapsed ms = 10], Moment[then=|162867872797875|now=|162867882771166|elapsed=|9973291|elapsed ms = 9], Moment[then=|162867882771166|now=|162867892719333|elapsed=|9948167|elapsed ms = 9], Moment[then=|162867892719333|now=|162867901537291|elapsed=|8817958|elapsed ms = 8], Moment[then=|162867901537291|now=|162867913086583|elapsed=|11549292|elapsed ms = 11], Moment[then=|162867913086583|now=|162867922725166|elapsed=|9638583|elapsed ms = 9], Moment[then=|162867922725166|now=|162867932766916|elapsed=|10041750|elapsed ms = 10], Moment[then=|162867932766916|now=|162867942723708|elapsed=|9956792|elapsed ms = 9], Moment[then=|162867942723708|now=|162867950987166|elapsed=|8263458|elapsed ms = 8], Moment[then=|162867950987166|now=|162867963205000|elapsed=|12217834|elapsed ms = 12], Moment[then=|162867963205000|now=|162867972662291|elapsed=|9457291|elapsed ms = 9], Moment[then=|162867972662291|now=|162867982797833|elapsed=|10135542|elapsed ms = 10], Moment[then=|162867982797833|now=|162867992885583|elapsed=|10087750|elapsed ms = 10], Moment[then=|162867992885583|now=|162868002963166|elapsed=|10077583|elapsed ms = 10], Moment[then=|162868002963166|now=|162868011406875|elapsed=|8443709|elapsed ms = 8], Moment[then=|162868011406875|now=|162868023188125|elapsed=|11781250|elapsed ms = 11], Moment[then=|162868023188125|now=|162868031231500|elapsed=|8043375|elapsed ms = 8], Moment[then=|162868031231500|now=|162868043275291|elapsed=|12043791|elapsed ms = 12], Moment[then=|162868043275291|now=|162868052630166|elapsed=|9354875|elapsed ms = 9], Moment[then=|162868052630166|now=|162868062829125|elapsed=|10198959|elapsed ms = 10], Moment[then=|162868062829125|now=|162868072762000|elapsed=|9932875|elapsed ms = 9], Moment[then=|162868072762000|now=|162868082837791|elapsed=|10075791|elapsed ms = 10], Moment[then=|162868082837791|now=|162868092819500|elapsed=|9981709|elapsed ms = 9], Moment[then=|162868092819500|now=|162868102766750|elapsed=|9947250|elapsed ms = 9], Moment[then=|162868102766750|now=|162868112903958|elapsed=|10137208|elapsed ms = 10], Moment[then=|162868112903958|now=|162868121689041|elapsed=|8785083|elapsed ms = 8], Moment[then=|162868121689041|now=|162868133048041|elapsed=|11359000|elapsed ms = 11], Moment[then=|162868133048041|now=|162868142725875|elapsed=|9677834|elapsed ms = 9], Moment[then=|162868142725875|now=|162868151383958|elapsed=|8658083|elapsed ms = 8], Moment[then=|162868151383958|now=|162868163148958|elapsed=|11765000|elapsed ms = 11], Moment[then=|162868163148958|now=|162868172674750|elapsed=|9525792|elapsed ms = 9], Moment[then=|162868172674750|now=|162868182812916|elapsed=|10138166|elapsed ms = 10], Moment[then=|162868182812916|now=|162868192789250|elapsed=|9976334|elapsed ms = 9], Moment[then=|162868192789250|now=|162868202785916|elapsed=|9996666|elapsed ms = 9], Moment[then=|162868202785916|now=|162868212745625|elapsed=|9959709|elapsed ms = 9], Moment[then=|162868212745625|now=|162868222741375|elapsed=|9995750|elapsed ms = 9]]
INFO - Demo end. 162868252016666