Poor man's profiler for Ruby
| # chp2/wrapper.rb | |
| require "json" | |
| require "benchmark" | |
| def measure(&block) | |
| no_gc = (ARGV[0] == "--no-gc") | |
| if no_gc | |
| GC.disable | |
| else | |
| # collect memory allocated during library loading | |
| # and our own code before the measurement | |
| GC.start | |
| end | |
| memory_before = `ps -o rss= -p #{Process.pid}`.to_i/1024 | |
| gc_stat_before = GC.stat | |
| time = Benchmark.realtime do | |
| yield | |
| end | |
| puts ObjectSpace.count_objects | |
| unless no_gc | |
| GC.start(full_mark: true, immediate_sweep: true, immediate_mark: false) | |
| end | |
| puts ObjectSpace.count_objects | |
| gc_stat_after = GC.stat | |
| memory_after = `ps -o rss= -p #{Process.pid}`.to_i/1024 | |
| puts({ | |
| RUBY_VERSION => { | |
| gc: no_gc ? 'disabled' : 'enabled', | |
| time: time.round(2), | |
| gc_count: gc_stat_after[:count] - gc_stat_before[:count], | |
| memory: "%d MB" % (memory_after - memory_before) | |
| } | |
| }.to_json) | |
| end |
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