如何将 CFLAGS 添加到 RVM？

Question

我要编译ruby-2.7.1。但是我不想覆盖系统的 ruby 2.7.1 因为很多包都依赖于 Ruby.

所以我最简单的选择是RVM。但我想在本地编译 Ruby 因为我永远不需要将二进制文件复制到另一个系统。有没有办法将 -O3、-march=native 和 -mtune=native 选项附加到 CFLAGS？

Answer 1

所以我最终使用了：

CC=gcc HOSTCC=gcc CFLAGS="-O3 -pipe -fno-plt -march=native -mtune=native" CXXFLAGS="-O3 -pipe -fno-plt -march=native -mtune=native" .rvm/bin/rvm install ruby-2.7.1

检查（编译后）：

~/.rvm/rubies/ruby-2.7.1/bin/ruby -e "puts RbConfig::CONFIG.then { |x| [x['CFLAGS'], x['CXXFLAGS']] }"

输出应该与此类似：

-O3 -pipe -fno-plt -march=native -mtune=native -fPIC
-O3 -pipe -fno-plt -march=native -mtune=native

我做了一个基准测试并获得了微小的性能提升：

def prime(range)
    (numbers = (2..range).to_a.unshift(nil, nil)).each do |num|
        next if num.nil?
        return numbers.compact if (sqr = num ** 2) > range
        sqr.step(range, num) { |x| numbers[x] = nil }
    end
end

def pi(n)
    q, r, t, k, m, x, str = 1, 0, 1, 1, 3, 3, ''

    if 4 * q + r - t < m * t
        str.concat(m.to_s)
        q, r, m = 10 * q, 10 * (r - m * t), (10 * (3 * q + r)) / t - 10 * m
    else
        q, r, t, k, m, x = q * k, (2 * q + r) * x, t * x, k + 1, (q * (7 * k + 2) + r * x) / (t * x), x + 2
    end while str.length < n

    str[1, 0] = '.'
    str
end

puts "Calculating prime numbers"
total_time = 0

10.times do
    time = Time.now
    prime(5_000_000)
    t = Time.now - time
    puts "Time taken: #{t} s"
    total_time += t
end
puts "Total time: #{total_time}\nCalculating digits of pi"
total_time = 0

5.times do
    time = Time.now
    pi(3000)
    t = Time.now - time
    puts "Time taken: #{t} s"
    total_time += t
end
puts "Total time: #{total_time}"

输出：

Ruby 2.7.1-3（通用 x64）（由 Archlinux 社区编译）：

Calculating prime numbers
Time taken: 0.875989347 s
Time taken: 0.867194701 s
Time taken: 0.888623001 s
Time taken: 0.896203257 s
Time taken: 0.878371141 s
Time taken: 0.870071403 s
Time taken: 0.885831722 s
Time taken: 0.893377101 s
Time taken: 0.878395115 s
Time taken: 0.869960278 s
Total time: 8.804017066
Calculating digits of pi
Time taken: 0.789893805 s
Time taken: 0.77520548 s
Time taken: 0.775608948 s
Time taken: 0.775225198 s
Time taken: 0.774519429 s
Total time: 3.8904528600000003

Ruby 2.7.1（本机，x64）（现在编译）：

Calculating prime numbers
Time taken: 0.784012172 s
Time taken: 0.77873184 s
Time taken: 0.794907106 s
Time taken: 0.804767279 s
Time taken: 0.784964685 s
Time taken: 0.779715785 s
Time taken: 0.795503235 s
Time taken: 0.803209593 s
Time taken: 0.785618289 s
Time taken: 0.77906647 s
Total time: 7.890496454000001
Calculating digits of pi
Time taken: 0.794860247 s
Time taken: 0.768611289 s
Time taken: 0.77029717 s
Time taken: 0.753028667 s
Time taken: 0.752961357 s
Total time: 3.83975873

在基准测试期间，我使用了相同的终端，没有 GUI 进程运行ning。我以 4 - 5 秒的间隔进行了基准测试。即使我运行一次又一次地测试，我也可以确认相同的输出。

如何将 CFLAGS 添加到 RVM？

How to add CFLAGS to RVM?

rvm

我做了一个基准测试并获得了微小的性能提升：