[Pvfs2-users] Re: PVFS2 over infiniband: pvfs2-client-core uses up 100% CPU

[Vikrant Kumar]

I think what I saw yesterday was that after I had run some benchmarks on 
pvfs2-IB, the pvfs2-client-core was showing 100% cpu activity for a 
couple of hours after that. Things are fine today.

Im running pvfs2-1.5.1.


Pete Wyckoff wrote:
> vsk at fluent.co.in wrote on Mon, 28 Aug 2006 21:10 +0530:
>   
>> The pvfs2-IB cluster is up finally and there is some speedup as compared 
>> to a pvfs2-TCP setup on a different cluster. But Im seeing one strange 
>> thing on the IB setup: the pvfs2-client-core is using up 100% CPU even 
>> in the absence of file-system activity. I saw on pvfs2 FAQs one entry 
>> related to pvfs2-server CPU usage, but none related to 
>> pvfs2-client-core. Have other people run into a similar problem? Note 
>> that on the pvfs2-TCP cluster, which is similarly configured except for 
>> not having Infiniband, pvfs2-client-core is quite well behaved.
>>     
>
> Haven't seen the client-core consuming 100% cpu yet.  I'm running
> your setup here and it's idle except during transfers.  Can you
> verify that the client-core chews a full CPU as soon as it is
> started up?  Or if you have to do use the file system for a while
> before it goes into this mode?  I'm trying to understand what could
> be causing it.
>
> Actually I'm just finding a bug in the pvfs2-IB polling method now
> that may add _server_ load, not sure about client; I'll let you know
> when I've got it figured out.  Please tell me again which version of
> PVFS2 you're running?  CVS Head or one of the releases?
>
> 		-- Pete
>
>