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List:       oprofile-list
Subject:    RE: no samples found and buffer size problem
From:       "vijeta johri" <vijeta () cs ! duke ! edu>
Date:       2005-03-22 5:39:38
Message-ID: 200503220539.j2M5dctA016496 () duke ! cs ! duke ! edu
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I had earlier tried with default settings of 6000 and also 4,00,000 and was
getting the same error. I will go over the tutorial you mentioned and then
see what happens.
Thanks a lot for your help.
Vijeta

-----Original Message-----
From: oprofile-list-admin@lists.sourceforge.net
[mailto:oprofile-list-admin@lists.sourceforge.net] On Behalf Of William
Cohen
Sent: Tuesday, March 22, 2005 12:23 AM
To: Vijeta Johri
Cc: oprofile-list@lists.sourceforge.net
Subject: Re: no samples found and buffer size problem

Vijeta Johri wrote:
> I am using oprofile 0.7.1 on a 2.4.25 kernel.
> After I am doing opcontrol --dump and then do opreport I don't get any 
> results as no samples are found. I checked dmesg and it said to increase 
> the buffer size etc. I increased the kernel buffer size to 1048576 and 
> set the counter value of global_power_events to 40000000, but I am still 
> getting the same error.Any suggestions?
> Thanks,
> Vijeta

Hi,

You might want to look over the tutorial on OProfile at
http://people.redhat.com/wcohen/ to make sure that module is being 
loaded. A number of the distributions include a version of OProfile with 
their distribution. If there is a version of OProfile included in the 
distribution, use that. mixing Kernel and OProfile versions trips up 
many people.

Your count for global_power_events looks very high, 40,000,000. This is 
the number of unhalted processor cycles per sample. This would would be 
75 samples per second on a 3GHz processor that is running unhalted. The 
processor usually goes into halted mode when waiting for IO, and it is 
quite possible that you didn't get any samples at all.  Smaller counter 
valuer for more samples per second. You might try to use the default 
event setting before changing things.

-Will




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