How to use perftools.rb

shell+ruby

# generate profile around a script/test
$ CPUPROFILE=/tmp/my_app_profile RUBYOPT="-r`gem which perftools | tail -1`" ruby -I spec spec/models/user_role_spec.rb

# generate profile using a block
# (this is in ruby obviously)
require 'perftools'
PerfTools::CpuProfiler.start("/tmp/add_numbers_profile") do
  5_000_000.times{ 1+2+3+4+5 }
end

# show as text
$ pprof.rb --text /tmp/my_app_profile

# show as gif
$ pprof.rb --gif /tmp/my_app_profile > /tmp/my_app_profile.gif

# if that fails,
$ brew install graphviz ghostscript

shellruby

# generate profile around a script/test
$ CPUPROFILE=/tmp/my_app_profile RUBYOPT="-r`gem which perftools | tail -1`" ruby -I spec spec/models/user_role_spec.rb

# generate profile using a block
# (this is in ruby obviously)
require 'perftools'
PerfTools::CpuProfiler.start("/tmp/add_numbers_profile") do
  5_000_000.times{ 1+2+3+4+5 }
end

# show as text
$ pprof.rb --text /tmp/my_app_profile

# show as gif
$ pprof.rb --gif /tmp/my_app_profile > /tmp/my_app_profile.gif

# if that fails,
$ brew install graphviz ghostscript