Issue #10165 has been updated by Eric Wong. I like this. The speedup is from reduction of allocations+GC I think you need to fall back to CLOCK_REALTIME on systems w/o CLOCK_MONOTONIC, though. Based on my reading of process.c, CLOCK_REALTIME is always available. So something like this: if defined?(Process::CLOCK_MONOTONIC) BENCHMARK_CLOCK = Process::CLOCK_MONOTONIC else # Ruby may use gettimeofday to emulate: BENCHMARK_CLOCK = Process::CLOCK_REALTIME end def realtime # :yield: r0 = Process.clock_gettime(BENCHMARK_CLOCK) yield Process.clock_gettime(BENCHMARK_CLOCK) - r0 end ---------------------------------------- Feature #10165: Use Process.clock_gettime to speed up Benchmark.realtime. https://bugs.ruby-lang.org/issues/10165#change-48457 * Author: Pete Higgins * Status: Open * Priority: Normal * Assignee: * Category: * Target version: ---------------------------------------- This patch changes the Benchmark.realtime method to use the Process.clock_gettime internally when generating the time elapsed. Calling Process.clock_gettime is faster than the current way of creating Time objects. I wrote a benchmark script (also attached) to demonstrate the difference: ``` require 'benchmark' def old_benchmark r0 = Time.now yield Time.now - r0 end def new_benchmark r0 = Process.clock_gettime(Process::CLOCK_MONOTONIC) yield Process.clock_gettime(Process::CLOCK_MONOTONIC) - r0 end n = (ARGV.first || 1_000_000).to_i puts "#{n} iterations." Benchmark.bmbm do |b| b.report("old") { n.times { old_benchmark { nil } } } b.report("new") { n.times { new_benchmark { nil } } } end ``` When I run this on my local machine I see this output: ``` 1000000 iterations. Rehearsal --------------------------------------- old 0.860000 0.000000 0.860000 ( 0.863118) new 0.360000 0.000000 0.360000 ( 0.355242) ------------------------------ total: 1.220000sec user system total real old 0.870000 0.010000 0.880000 ( 0.866577) new 0.330000 0.000000 0.330000 ( 0.328982) ``` I discussed this idea originally with Eric Hodel, but he has not reviewed this code. ---Files-------------------------------- benchmark_benchmark_realtime.rb (424 Bytes) faster_benchmark_realtime.diff (909 Bytes) -- https://bugs.ruby-lang.org/