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List: strace
Subject: Difference in timings with strace and time comman
From: Dilip Angal <dangal () casecentral ! com>
Date: 2004-08-09 7:00:00
Message-ID: 36991EC400A874408694E978FE53CE9507E323D7 () exchgp2 ! casecentral ! com
[Download RAW message or body]
Hi
I am trying to do some profiling of one of the third part tool I am likely
to use for which I do not have source code.
I tried to run it using time command and later with strace.
I noticed that system time reported by time is o where close to the sum of
the system call times reported stace.
Of course I have many read and write calls.
So here are my questions.
Does strace includes IO wait time in the timing reported in read?
And I presume time command does not and hence timing reported by time and
strace are completely skewed
Any help will be appreciated
Thanks
Dilip
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am trying to do some profiling of one of the third part
tool I am likely to use for which I do not have source \
code.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I tried to run it using time command and later with \
strace.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I noticed that system time reported by time is o where close
to the sum of the system call times reported stace.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Of course I have many read and write \
calls.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>So here are my questions.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Does strace includes IO wait time in the timing reported in
read?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>And I presume time command does not and hence timing
reported by time and strace are completely skewed<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Any help will be appreciated<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dilip<o:p></o:p></span></font></p>
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