Re: [Gems-users] Processor Lost

[Kevin Moore <kmoore@xxxxxxxxxxx>]

James,
	Binding a thread to a processor does not mean that it will 
run there continuously.  It just means that the thread will 
only run on that processor.  If you've created a processor 
set (psrset), and bound only the one thread to that set, no 
other user threads will run in that set.  But, OS processes 
can and do sometimes run on bound processors.  For whatever 
reason, Solaris likes to run mostly on processor 0.  For 
that reason, what we typically do is to create a processor 
set for each other processor (not p0) and bind our threads 
to those sets.
--Kevin

James Wang wrote:
> Hi Dan:
>     Thank you very much for your prompt reply. But I don't really understand what the nature of this situation is. Why would the OS want to deschedule my 
> benchmark? Also, I bound the thread to the processor, should it just stay there and run? I did this with a four processor simulated machine, why other processors
> are not affected by this problem? 
>
>  
> Regards
> James
>
> ----- Original Message ----
> From: Dan Gibson <degibson@xxxxxxxx>
> To: Gems Users <gems-users@xxxxxxxxxxx>
> Sent: Friday, May 4, 2007 1:03:42 AM
> Subject: Re: [Gems-users] Processor Lost
>
> The OS could be descheduling your transactional benchmark, though I'm 
> not sure why that might be happening. Try quiescing the system by 
> killing background processes, and then pre-fetch any binaries or data 
> you might be using in your benchmark by running it once to completion 
> before loading Ruby (and hence, without synchronization). That should 
> eliminate any I/O you might inadvertenly cause at runtime. It will also 
> cause your benchmark to run with different system interactions, and will 
> hopefully fix the Processor Lost/Processor Found problem.
> Regards,
> Dan
>
> James Wang wrote:
>
> > Hi All:
> >    I am running some transactional memory benchmark using a customized SMP cache coherent protocol. For some reason, p0 will run code other than the transactional benchmark and the other processors finishes fine. I cannot really tell what p0 is doing. I tried a few different random seed, the same situation happens every time. 
> >    Any idea?
> >    Thanks for any reply in advance.
> >
> > Regards
> > James
> >
> >
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