[mvapich-discuss] Intel AMD run

[Lei Chai]

Hi Jasjit,

I just tried IMB-3.0 (the new PALLAS) and mvapich2 with one Intel and 
one AMD machine and it was running fine. How did you compile mvapich2 
and the program? If you compile on one machine and try to run the same 
program through a shared file system (e.g. NFS) then there shouldn't be 
any problem. If you compile two versions, one on Intel and one on AMD 
and try to run them together , then you are likely to observe hanging, 
since we have platform specific thresholds for performance 
optimizations, and therefore we don't recommend you to do so. If you 
continue to see the problem, please send us your output file (I didn't 
see it in your previous email).

Thanks,
Lei


jasjit singh wrote:
> Hi
>
> I am running PALLAS v2.2 over mvapich2-1.0.1.
> We have Silverstorm's Infiniband cards.
> I am using OFED-1.2.5.3.
> I have tried with both gen2 and udapl stacks. Both give the same 
> result for all my runs.
> OS is RHEL4-U5  2.6.9-55.ELlargesmp
>
> First I ran it between two Intel (Xeon) machines with number of 
> processes equal to two. It went through successfully.
>
> Then I ran between two AMD (Opteron) machines with the same number of 
> processes. It also went through.
>
> Thereafter I tried between one Intel machine and one AMD machine. Then 
> it didn't run. It was stuck at the very start(Output file is attached).
>
> Has anybody tried this kind of thing earlier?
>
> I have also tried, between Intel and AMD, a DAPL level application 
> that does dat_ep_post_rdma_write() continuously in a bidirectional 
> manner. This was running finely.
>
> So...
> Has MPI something specific to Intel and/or AMD architectures ?
> Can I do some work around to make it run?
> Or I am not supposed to run this across different architectures ?
>
> I tried one other variation by compiliing MPI (udapl) without two 
> flags namely _SMP_ and RDMA_FAST_PATH.
> Then also it was running finely.
> So does it have anything to do with RDMA_FAST_PATH flag ?
>
> Thanks in advance,
> Jasjit Singh
>
> ------------------------------------------------------------------------
> Not happy with your email address?
> Get the one you really want <http://uk.docs.yahoo.com/ymail/new.html> 
> - millions of new email addresses available now at Yahoo! 
> <http://uk.docs.yahoo.com/ymail/new.html>
> ------------------------------------------------------------------------
>
> _______________________________________________
> mvapich-discuss mailing list
> mvapich-discuss at cse.ohio-state.edu
> http://mail.cse.ohio-state.edu/mailman/listinfo/mvapich-discuss
>