From: "Sandor Szücs" <sandor.szuecs@...>
Date: 2009-02-25T20:35:13+09:00
Subject: Re: Help interpreting benchmark results


On 24.02.2009, at 23:35, Juan Alvarez wrote:

> These are the results I get:
>
>                                  user     system      total         
> real
> Curl::Easy.http_get   0.070000   0.130000   0.200000 ( 26.319104)
> RestClient.get          0.970000   0.580000   1.550000 ( 23.557923)
>
> I get these results consistently where curb's user, system and total
> times are dramatically lower than Net::HTTP's. However, Net:HTTP is
> reported to run faster by the real column. Shouldn't the reported real
> time be consistent with the other columns?

No. "real" measures the time that is passed from start to finish.

Pseudocode
   real_start = Time.now
   yield # run test
   real_end = Time.now
   real_start.to_f - real_end.to_f


If the Kernel of your OS schedules another processes for, say 20  
seconds,
then the difference between total and real is >= 20 seconds.
I think the time called "real" should not be trusted in an evaluation.

regards, Sandor Szücs
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