了解 Jeprofile 输出

Question

我能够根据此处的描述生成如下 Jeprofile 输出

请找到 jemalloc 输出和图表。

> Using local file /bin/java. Using local file jeprof.57473.0.f.heap.
> Total: 79372091 B 78084060  98.4%  98.4% 78084060  98.4%
> je_prof_backtrace  1288031   1.6% 100.0%  1474342   1.9%
> Java_java_util_zip_ZipFile_getZipMessage
>        0   0.0% 100.0%  6889972   8.7% 0x00007f3d5ebac3e6
>        0   0.0% 100.0%   270421   0.3% 0x00007f3d5ebb8a79
>        0   0.0% 100.0%   727762   0.9% 0x00007f3d5ebb8a87
>        0   0.0% 100.0%   589239   0.7% 0x00007f3d5ebb9ab2
>        0   0.0% 100.0%   854269   1.1% 0x00007f3d5ebb9ac0
>        0   0.0% 100.0%   270421   0.3% 0x00007f3d5ebb9cb7
>        0   0.0% 100.0%   135210   0.2% 0x00007f3d5ebbc5fa
>        0   0.0% 100.0%   135210   0.2% 0x00007f3d5ebbc768
>        0   0.0% 100.0%   135210   0.2% 0x00007f3d5ee57146
>        0   0.0% 100.0%   143743   0.2% 0x00007f3d5ee8bc25
>        0   0.0% 100.0%   444413   0.6% 0x00007f3d5ef13945
>        0   0.0% 100.0%   136258   0.2% 0x00007f3d5ef764fb
>        0   0.0% 100.0%  8463202  10.7% 0x00007f3d5efbdb8a
>        0   0.0% 100.0%   143743   0.2% 0x00007f3d5f220c67
>        0   0.0% 100.0%   135210   0.2% 0x00007f3d5f3a5c65
>        0   0.0% 100.0% 55473738  69.9% AsyncGetCallTrace
>        0   0.0% 100.0% 48103708  60.6% JLI_GetStdArgc
>        0   0.0% 100.0% 48103708  60.6% JNI_CreateJavaVM
>        0   0.0% 100.0% 11897251  15.0% JNI_GetCreatedJavaVMs
>        0   0.0% 100.0% 11897251  15.0% JVM_DefineClassWithSource
>        0   0.0% 100.0%   271469   0.3% JVM_FindClassFromBootLoader
>        0   0.0% 100.0%   431486   0.5% JVM_FindClassFromCaller
>        0   0.0% 100.0%   131120   0.2% JVM_FindLoadedClass
>        0   0.0% 100.0% 76994237  97.0% JVM_FindSignal
>        0   0.0% 100.0%   148137   0.2% JVM_GetCPMethodClassNameUTF
>        0   0.0% 100.0%   148137   0.2% JVM_GetCPMethodSignatureUTF
>        0   0.0% 100.0%   135210   0.2% JVM_GetClassDeclaredFields
>        0   0.0% 100.0%   405631   0.5% JVM_GetClassName
>        0   0.0% 100.0%   143743   0.2% JVM_IHashCode
>        0   0.0% 100.0%   143743   0.2% JVM_MonitorWait
>        0   0.0% 100.0%   431486   0.5% JVM_RawMonitorExit
>        0   0.0% 100.0%   659324   0.8% JVM_StartThread
>        0   0.0% 100.0% 77220036  97.3% JVM_handle_linux_signal
>        0   0.0% 100.0% 11897251  15.0% Java_java_lang_ClassLoader_defineClass1
>        0   0.0% 100.0%   271469   0.3% Java_java_lang_ClassLoader_findBootstrapClass
>        0   0.0% 100.0%   431486   0.5% Java_java_lang_Class_forName0
>        0   0.0% 100.0%   592551   0.7% Java_java_util_zip_Inflater_inflateBytes
>        0   0.0% 100.0%   134688   0.2% Java_java_util_zip_Inflater_init
>        0   0.0% 100.0%  1117359   1.4% Java_java_util_zip_ZipFile_open
>        0   0.0% 100.0% 75438262  95.0% SUNWprivate_1.1
>        0   0.0% 100.0%   296275   0.4% VerifyClassForMajorVersion
>        0   0.0% 100.0%   356982   0.4% ZIP_Open
>        0   0.0% 100.0%  1474342   1.9% ZIP_Unlock
>        0   0.0% 100.0%   176271   0.2% _GLOBAL__sub_I_eh_alloc.cc
>        0   0.0% 100.0%   176271   0.2% _GLOBAL__sub_I_eh_alloc.cc (inline)
>        0   0.0% 100.0% 59721527  75.2% __clone
>        0   0.0% 100.0%   176271   0.2% __static_initialization_and_destruction_0 (inline)
>        0   0.0% 100.0%   176271   0.2% _dl_init_internal
>        0   0.0% 100.0%   176271   0.2% _dl_start_user
>        0   0.0% 100.0%   131184   0.2% fork1
>        0   0.0% 100.0% 78084060  98.4% imalloc (inline)
>        0   0.0% 100.0% 78084060  98.4% imalloc_body (inline)
>        0   0.0% 100.0%   592551   0.7% inflate
>        0   0.0% 100.0%   592551   0.7% inflateBackEnd
>        0   0.0% 100.0%   134688   0.2% inflateInit2_
>        0   0.0% 100.0% 78084060  98.4% je_malloc_default
>        0   0.0% 100.0% 78084060  98.4% prof_alloc_prep (inline)
>        0   0.0% 100.0% 59721527  75.2% start_thread

附上图表

需要一些帮助来了解问题出在哪里？

环境是：森托斯 7 Java 1.8.0 海湾合作委员会 9

谢谢！

Answer 1

在您的 jemalloc 输出中，JVM_FindSignal 占分配的 97%。这不可能是真的，因为 JVM_FindSignal 没有分配任何东西。

这一定是 . Install the package with JDK debug symbols as descibed in , or use JDK with built-in debug symbols, e.g. Liberica JDK.
jemalloc 对 Java 方法一无所知。它无法将 JIT 编译代码中的地址转换为 Java 方法名称。因此，您的 jemalloc 输出中有这么多地址（十六进制数字）。

有一个 Java 分析器，async-profiler, that can trace native memory allocations down to Java code, and show Java stack traces as Flame Graphs. Profiling malloc, mprotect and mmap calls with async-profiler can be helpful in finding native memory leaks. See this answer 了解详情。

有一个 presentation video 显示了使用 jemalloc 和 async-profiler 分析本机分配的示例。

了解 Jeprofile 输出

Understanding Jeprofile output

java

memory-leaks

jvm

java-native-interface

jemalloc