<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>MPICH is just the new version of MPICH2. We renamed it when we went past version 3.0. </div><div><br>On Dec 7, 2013, at 3:55 AM, Anatoly G <<a href="mailto:anatolyrishon@gmail.com">anatolyrishon@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Ok. I"ll try both Issend, and next step to upgrade MPICH to 3.0.4.<div>I thought before that MPICH & MPICH2 are two different branches, when MPICH2 partially supports Fault tolerance, but MPICH not. Now I understand, that I was wrong and MPICH2 is just main version of MPICH.<br>
</div><div><br></div><div>Thank you very much,<br></div><div>Anatoly.<br><div><br></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Dec 5, 2013 at 11:01 PM, Rajeev Thakur <span dir="ltr"><<a href="mailto:thakur@mcs.anl.gov" target="_blank">thakur@mcs.anl.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The master is receiving too many incoming messages than it can match quickly enough with Irecvs. Try using MPI_Issend instead of MPI_Isend.<br>
<span class="HOEnZb"><font color="#888888"><br>
Rajeev<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
On Dec 5, 2013, at 2:58 AM, Anatoly G <<a href="mailto:anatolyrishon@gmail.com">anatolyrishon@gmail.com</a>> wrote:<br>
<br>
> Hello.<br>
> I"m using MPICH2 1.5.<br>
> My system contains master and 16 slaves.<br>
> System uses number of communicators.<br>
> The single communicator used for below scenario:<br>
> Each slave sends non-stop 2Kbyte data buffer using MPI_Isend and waits using MPI_Wait.<br>
> Master starts with MPI_Irecv to each slave<br>
> Then in endless loop:<br>
> MPI_Waitany and MPI_Irecv on rank returned by MPI_Waitany.<br>
><br>
> Another communicator used for broadcast communication (commands between master + slaves),<br>
> but it's not used in parallel with previous communicator,<br>
> only before or after data transfer.<br>
><br>
> The system executed on two computers linked by 1Gbit/s Ethernet.<br>
> Master executed on first computer, all slaves on other one.<br>
> Network traffic is ~800Mbit/s.<br>
><br>
> After 1-2 minutes of execution, master process starts to increase it's memory allocation and network traffic becomes low.<br>
> This memory allocation & network traffic slow down continues until fail of MPI,<br>
> without core file save.<br>
> My program doesn't allocate memory. Can you please explain this behaviour.<br>
> How can I cause MPI to stop sending slaves if Master can't serve such traffic, instead of memory allocation and fail?<br>
><br>
><br>
> Thank you,<br>
> Anatoly.<br>
><br>
> P.S.<br>
> On my stand alone test, I simulate similar behaviour, but with single thread on each process (master & hosts).<br>
> When I start stand alone test, master stops slaves until it completes accumulated data processing and MPI doesn't increase memory allocation.<br>
> When Master is free slaves continue to send data.<br>
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