Hi Carsten, Netpipe is a good tool. It can give you raw latency i.e. without the MPI overhead (you can use it with MPI as well). As for the MPI latency there are many programs which can measure it. For example, Intel MPI Benchmark (former PMB) has PingPong test http://www.intel.com/cd/software/products/asmo-na/eng/cluster/clustertoo lkit/219848.htm The Network-Based Computing Laboratory at the Ohio State University used to host a number of benchmarking programs including the latency test. Unfortunately I do not have the link. I found that PathScale's link checker (derived from an OSU benchmark) is very handy. Perhaps you can find the link in the archive. Also check the archive on the issues with measuring latency. Best, Igor
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Carsten Aulbert Sent: 20 September 2007 12:12 To: Beowulf Mailing List Subject: [Beowulf] Measuring port to port latency Hi, since the rush of emails seems to be over right now, I would like to start another thread. How are you measuring port to port latency in your network easily? So far, I have found a small MPI-pingpong code at http://cluster.fisica.unam.mx/curso/mpi_intro/para_pingpong.html as well as netpipe at http://www.scl.ameslab.gov/Projects/Netpipe/ They look fine on their own, but since I'm just starting, any opinions? Cheers Carsten _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
