[mvapich-discuss] viarecv.c:613: viadev_eager_pull: Assertion `rhandle->vbuf_head != ((void *)0)' failed.

[Pavel Shamis (Pasha)]

Hi All,
viarecv.c:613 it is code from mvapich-0.9.7-mlx2.2.0
The same code exists in 0.9.9  -viarecv.c line 555
I will try to analyze the issue in mlx2.2.0

Regards,
Pasha

Matthew Koop wrote:
> Adam,
>
> Based on your line number, it appears that this is the 0.9.7-mlx that
> shipped as a part of OFED 1.1. Is this correct? If so, it will be very
> hard for us to determine if the issue is still there since it is a
> different codebase than the 0.9.7 shipped from OSU.
>
> If you are able to reproduce in any mode on 0.9.9 please let us know and
> we'll be very interested to investigate further.
>
> Thanks,
> Matt
>
> On Mon, 30 Apr 2007, Adam Moody wrote:
>
>   
>> Hello all,
>> One user's code will sometimes die with MVAPICH-1 0.9.7.  One a given
>> run, it will randomly lead to one of three outcomes:
>>     #1)  viarecv.c:613: viadev_eager_pull: Assertion `rhandle->vbuf_head
>> != ((void *)0)' failed.
>>     #2)  MPI_IRECV : Invalid count argument
>>     #3)  the code runs without error
>>  From what I can tell, in case #1, the message that leads to the
>> assertion failure is an unexpected eager message ~1700 bytes from an
>> off-node task.  The rhandle shows that vbufs_expected=1, but both
>> vbuf_head and vbuf_tail are NULL.
>>
>> So far, this code runs without error in 0.9.9.  I'd like to determine
>> whether 0.9.9 fixes the problem, or whether it's still out there, but
>> that the new optimizations in 0.9.9 affect timings in such a way so as
>> to increase our odds of avoiding it.  Are there any particular fixes in
>> 0.9.9 which address the race condition described above?
>> Thanks,
>> -Adam Moody
>> DEG/LLNL
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>>
>>     
>
>
>
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