Re: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

Thanks Josh. Actually I also tested with the Himeno benchmarkand got the same problem, so I think this could be a bug. Hope this information also helps. Regards, Nguyen Toan On Fri, Mar 4, 2011 at 12:04 AM, Joshua Hursey

Re: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

Thanks for the program. I created a ticket for this performance bug and attached the tarball to the ticket: https://svn.open-mpi.org/trac/ompi/ticket/2743 I do not know exactly when I will be able to get back to this, but hopefully soon. I added you to the CC so you should receive any

Re: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

I have not had the time to look into the performance problem yet, and probably won't for a little while. Can you send me a small program that illustrates the performance problem, and I'll file a bug so we don't lose track of it. Thanks, Josh On Feb 25, 2011, at 1:31 PM, Nguyen Toan wrote: >

Re: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

Dear Josh, Did you find out the problem? I still cannot progress anything. Hope to hear some good news from you. Regards, Nguyen Toan On Sun, Feb 13, 2011 at 3:04 PM, Nguyen Toan wrote: > Hi Josh, > > I tried the MCA parameter you mentioned but it did not help, the

Re: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

Hi Josh, I tried the MCA parameter you mentioned but it did not help, the unknown overhead still exists. Here I attach the output of 'ompi_info', both version 1.5 and 1.5.1. Hope you can find out the problem. Thank you. Regards, Nguyen Toan On Wed, Feb 9, 2011 at 11:08 PM, Joshua Hursey

Re: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

It looks like the logic in the configure script is turning on the FT thread for you when you specify both '--with-ft=cr' and '--enable-mpi-threads'. Can you send me the output of 'ompi_info'? Can you also try the MCA parameter that I mentioned earlier to see if that changes the performance? I

Re: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

Hi Josh, Thanks for the reply. I did not use the '--enable-ft-thread' option. Here is my build options: CFLAGS=-g \ ./configure \ --with-ft=cr \ --enable-mpi-threads \ --with-blcr=/home/nguyen/opt/blcr \ --with-blcr-libdir=/home/nguyen/opt/blcr/lib \ --prefix=/home/nguyen/opt/openmpi \

Re: [OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

There are a few reasons why this might be occurring. Did you build with the '--enable-ft-thread' option? If so, it looks like I didn't move over the thread_sleep_wait adjustment from the trunk - the thread was being a bit too aggressive. Try adding the following to your command line options,

[OMPI users] Unknown overhead in "mpirun -am ft-enable-cr"

Hi all, I am using the latest version of OpenMPI (1.5.1) and BLCR (0.8.2). I found that when running an application,which uses MPI_Isend, MPI_Irecv and MPI_Wait, enabling C/R, i.e using "-am ft-enable-cr", the application runtime is much longer than the normal execution with mpirun (no checkpoint