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Date: Fri, 6 May 2005 14:20:40 +0200
From: Fabio Brugnara <brugnara@itc.it>
To: Andrew Morton <akpm@osdl.org>
Cc: Fabio Brugnara <brugnara@itc.it>, linux-kernel@vger.kernel.org
Subject: Re: problem with mmap over nfs
Message-ID: <20050506122040.GT9742@maestoso.itc.it>
References: <20050506095023.GS9742@maestoso.itc.it> <20050506045446.1deba35d.akpm@osdl.org>
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> Could you please generate a kernel profile?
> 
> - Compile with CONFIG_PROFILING
> 
> - Start the workload, wait for steady state.
> 
> - As root, run:
> 
> #!/bin/sh
> 
> SM=/boot/System.map
> TIMEFILE=/tmp/prof.time
> readprofile -r
> sleep 10
> readprofile -n -v -m $SM | sort -n +2 | tail -40 | tee $TIMEFILE >&2
> 
> (make sure that /boot/System.map is from the currently-running kernel)
> 
> More in Documentation/basic_profiling.txt
> 
> 
> 
> Even better, learn to drive oprofile.  Once it's running properly I usually
> use this silly script:
> 
> #!/bin/sh
> opcontrol --stop
> opcontrol --shutdown
> rm -rf /var/lib/oprofile
> opcontrol --vmlinux=/boot/vmlinux-$(uname -r)
> opcontrol --start-daemon
> opcontrol --start
> sleep 10
> opcontrol --stop
> opcontrol --shutdown
> opreport -l /boot/vmlinux-$(uname -r) | head -50


Wow! Thank you, Andrew.
If we have to consider me alone, this sounds like a dentist
that says "please extract your bad teeth and send it for the fix".
But I hope I'm able to do it with the help of our system administrators.

best regards,
thank you again for your attention,
Fabio