Re: How to track hard drive seeks?(more info/questions)

[servis@purdue.edu]

On 23 Feb, Brian White wrote:
>> I attached strace to the update process and it is doing as it says,
>> sleeps for 5 seconds and then calls bdflush(). I can't watch bdflush
>> because it is a new process everytime.
> 
> Have you tried strace with the "-f" option and friends (-o, -ff)?
> 

strace -p <update pid> -f   didn't trap the bdflush process.  This is
the strace chunk of update that gets repeated every 5 seconds if anyone
is interested.

---- SIGALRM (Alarm clock) ---
<... sigsuspend resumed> )              = -1 EINTR (Interrupted system call)
sigreturn()                             = ? (mask now [ALRM])
time(NULL)                              = 888350666
sigaction(SIGALRM, {SIG_DFL}, NULL)     = 0
alarm(0)                                = 0
sigprocmask(SIG_SETMASK, [], NULL)      = 0
bdflush()                               = 0
sigprocmask(SIG_BLOCK, [ALRM], [])      = 0
sigaction(SIGALRM, {0x40042568, [], 0}, {SIG_DFL}) = 0
time(NULL)                              = 888350666
alarm(5)                                = 0
sigsuspend([] <unfinished ...>


Brian
-- 
Mechanical Engineering                              servis@purdue.edu
Purdue University                   http://www.ecn.purdue.edu/~servis


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