[PVFS-users] FW: PVFS Hangups during concurrent read/writes

[Brannen S Hough]

	Some more info - I figured I'd try to eliminate my test program as a
source of the problems.  So I configured my Xeon as a single node PVFS
cluster (running Manager, a single IOD, and mounting the filesystem) and ran
2 copies of my test program (hitting different directories in the PVFS
space) overnight.  No problem.  I'll let you know what else I find out as I
go.

	Thanks,
	- Brannen

> -----Original Message-----
> From: Rob Ross [mailto:rross at mcs.anl.gov]
> Sent: Tuesday, August 03, 2004 2:58 PM
> To: Brannen S Hough
> Cc: pvfs-users at beowulf-underground.org
> Subject: Re: [PVFS-users] FW: PVFS Hangups during concurrent read/writes
> 
> Hi Brannen,
> 
> Thanks for the problem report and for trying the newest prerelease before
> getting back to us!
> 
> What exactly is your test program?
> 
> Does this only happen when you have the two iods running on the same
> node?
> 
> It would be helpful to us for you to recompile with "-g", attach to the
> pvfsd, and get a stack dump.  Also some debugging output could help... try
> 0x077 and see if that gets much into the pvfsdlog file as a start.
> 
> The iods don't coordinate read and write operations in a way that would
> cause deadlock, so that shouldn't be it.  The mgr just serializes
> everything it does, so that should be ok too.  I'm not sure what is going
> on quite yet...
> 
> Rob
>