Thanks alot for your reply, I'm using blocking Send and Receive. All the clients are sending data and the server is receive the messages from the clients with MPI_ANY_SOURCE as the sender. Do you think there is a race condition near this pattern?
I searched a lot and used totalview but I couldn't detect such case. I really appreciate if you send me a link or give an example of a possible race condition in that scenario . Also, when I partition the message into smaller parts (send in sequence - all the other clients wait until the send finish) it works fine. is that exclude the race condition? Regards, Amr >>We've seen similar things in our code. In our case it is probably due to a >>race condition. Try running the segv'ing process in a debugger, and it will >>likely show you a bug in your code >>On Feb 24, 2010 9:36 PM, "Amr Hassan " <amr.abdelaziz_at_[hidden]> wrote: >>Hi All, >>I'm facing a strange problem with OpenMPI. >>I'm developing an application which is required to send a message from each >>client (1 MB each) to a server node for around 10 times per second (it's a >>distributed render application and I'm trying to reach a higher frame rate >>). The problem is that OpenMPI crash in that case and only works if I >>partition this messages into a set of 20 k sub-messages with a sleep between >>each one of them for around 1 to 10 ms!! This solution is very expensive in >>term of time needed to send the data. Is there any other solutions? >>The error i got now is: >>Signal: Segmentation fault (11) >>Signal code: Address not mapped (1) >>Failing at address: xxxxxxxxxxxxx >>The OS is Linux CentOS. I'm using the latest version of OpenMPI. >>I appreciate any help regarding that. >>Regards, >>Amr
