[OMPI users] send message twice

2010-09-13 Thread 김효한
Hi all. I have some problem with sending messages. I want to send 2 messages to each node. for example, send 2 messages to 2 nodes, if (rank == 0) { for (dest = 1; dest < numProcs; dest++) { MPI_Send(&a, 1, MPI_INT, dest, 1, MPI_COMM_WORLD); MPI_Send(&b, 1, MPI_INT, dest, 2, MPI_COMM_WORLD);

Re: [OMPI users] send message twice

2010-09-13 Thread Trent Creekmore
I find issues like this is related to security issue. Firewall, not enough access privilege, SE Linux, etc. From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of ??? Sent: Monday, September 13, 2010 12:04 AM To: us...@open-mpi.org Subject: [OMPI users] send messag

Re: [OMPI users] send message twice

2010-09-13 Thread Srikanth Raju
2010/9/13 김효한 > Hi all. > > I have some problem with sending messages. I want to send 2 messages to > each node. > > for example, send 2 messages to 2 nodes, > > if (rank == 0) { > for (dest = 1; dest < numProcs; dest++) { > MPI_Send(&a, 1, MPI_INT, dest, 1, MPI_COMM_WORLD

[OMPI users] computing the latency with OpenMpi

2010-09-13 Thread Georges Markomanolis
Dear all, I have some questions about the duration of the communication with MPI_Send and MPI_Recv. I am using either SkaMPI either my implementation to measure the pingpong (MPI_Send and MPI_Recv) time between two nodes for 1 byte and more. The timing of the pingpong is 106.8 microseconds. A

[OMPI users] latency #2

2010-09-13 Thread Georges Markomanolis
Dear all, Hi again, after using MPI_Ssend seems to be what I was looking for but I would like to know more about MPI_Send. For example sending 1 byte with MPI_Send it takes 8.69 microsec but with MPI_Ssend it takes 152.9 microsec. I understand the difference but it seems that from one messag

Re: [OMPI users] latency #2

2010-09-13 Thread Ashley Pittman
On 13 Sep 2010, at 12:20, Georges Markomanolis wrote: > Dear all, > > Hi again, after using MPI_Ssend seems to be what I was looking for but I > would like to know more about MPI_Send. > > For example sending 1 byte with MPI_Send it takes 8.69 microsec but with > MPI_Ssend it takes 152.9 micr

Re: [OMPI users] computing the latency with OpenMpi

2010-09-13 Thread Eugene Loh
Georges Markomanolis wrote: I have some questions about the duration of the communication with MPI_Send and MPI_Recv. I am using either SkaMPI either my implementation to measure the pingpong (MPI_Send and MPI_Recv) time between two nodes for 1 byte and more. The timing of the pingpong is 106

Re: [OMPI users] latency #2

2010-09-13 Thread Eugene Loh
Georges Markomanolis wrote: Dear all, Hi again, after using MPI_Ssend seems to be what I was looking for but I would like to know more about MPI_Send. For example sending 1 byte with MPI_Send it takes 8.69 microsec but with MPI_Ssend it takes 152.9 microsec. I understand the difference but

[OMPI users] Question on staging in checkpoint

2010-09-13 Thread ananda.mudar
Hi I was trying out the staging option in checkpoint where I save the checkpoint image in local file system and have the image transferred to global filesystem in the background. As part of the background process I see that the "scp" command is launched to transfer the images from local file sys

Re: [OMPI users] Question on staging in checkpoint

2010-09-13 Thread Joshua Hursey
Adjust the 'filem_rsh_max_incomming' parameter: http://osl.iu.edu/research/ft/ompi-cr/api.php#mca-filem_rsh_max_incomming I defaulted this MCA parameter to 10 since, depending on how big each individual checkpoint is, you will find that often sending them all at once is often worse than sending