How to add CFLAGS to RVM?

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I want to compile ruby-2.7.1. But I don't want override the system's ruby 2.7.1 because a lot of packages depends on Ruby.

So my easiest choice is RVM. But I want to compile Ruby natively because I will never need to copy the binary to another system. Is there a way to append -O3, -march=native, and -mtune=native option to CFLAGS?

rvm
1 Answers

So I ended up using:

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

To check (after compilation):

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

Output should be similar to this:

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

I did a Benchmark And I got a Tiny Performance Boost:

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}"

Output:

  • Ruby 2.7.1-3 (generic x64) (compiled by Archlinux community):
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 (native, x64) (compiled now):
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

During the benchmark, I used the same terminal, no GUI processes running. I did the benchmarks at 4 - 5 seconds interval. I can confirm the same output even if I run the tests again and again.

user_110897580
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