Benchmark模块提供了一些方法来测量和报告Ruby代码的执行时间。
下面我们来测量"a"*1_000_000的执行时间:
require 'benchmark'
puts Benchmark.measure { "a"*1_000_000 }
结果如下(我的电脑是i3,linux mint操作系统):
xiongxin@rubyonrails ~/ruby/6-7 $ ruby benchmark-t.rb
0.000000 0.000000 0.000000 ( 0.000599)
下面Benchmark模块提供measure方法的代码
def measure(label = "") # :yield:
t0, r0 = Process.times, Time.now
yield
t1, r1 = Process.times, Time.now
Benchmark::Tms.new(t1.utime - t0.utime,
t1.stime - t0.stime,
t1.cutime - t0.cutime,
t1.cstime - t0.cstime,
r1 - r0,
label)
end
注释:Process.times
返回 Tms structure,包括用户和系统CPU时间
t = Process.times
#其实现在 t = [ t.utime, t.stime, t.cutime, t.cstime ]
我们来一个一个分析他的返回值:Struct::Tms#cstime() #=> Float
Returns the number of seconds of system CPU time consumed by waited-for, terminated child processes, i.e. the sum of their Struct::Tms#stime and Struct::Tms#cstime values. Returns 0.0 on Windows.
Struct::Tms#cutime() #=> Float
Returns the number of seconds of user CPU time consumed by waited-for, terminated child processes, i.e. the sum of their Struct::Tms#utime and Struct::Tms#cutime values. Returns 0.0 on Windows.
Struct::Tms#stime() #=> Float
Returns the number of seconds of system CPU time consumed by the calling process.
Struct::Tms#utime() #=> Float
Returns the number of seconds of user CPU time consumed by the calling process.
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