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To: cswiger@mac.com
From: Akihiro KAYAMA <kayama@personal-media.co.jp>
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Cc: freebsd-questions@freebsd.org
Subject: Re: wall-clock time profiling
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In article <465DB587.6010109@mac.com>,
Chuck Swiger <cswiger@mac.com> writes:

cswiger> Akihiro KAYAMA wrote:
cswiger> > Hi all.
cswiger> > 
cswiger> > What is the right way to measure wall-clock time in profiling on FreeBSD?
cswiger> 
cswiger> The time shell builtin command or "/usr/bin/time -l _program_"?
cswiger> 
cswiger> The latter variant displays the rusage struct (ie, from "man getrusage")?

Thanks for your response.

Yes, we can know whether the program is I/O bound or CPU bound by
time(1). But it is still unclear which part of the program is really
waiting for I/O. So profiling is needed for tuning, although CPU time
profiling gives me non-distinct result on I/O bound programs.  It is
reason why I want wall-clock time profiling.

--
Akihiro KAYAMA