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<!-- keep this as a security measure: * Set ALLOWTOPICCHANGE = Main.TWikiAdminGroup,Main.LCGAdminGroup * Set ALLOWTOPICRENAME = Main.TWikiAdminGroup,Main.LCGAdminGroup #uncomment this if you want the page only be viewable by the internal people * #Set ALLOWTOPICVIEW = Main.TWikiAdminGroup,Main.LCGAdminGroup --> ---+ Throughput Tests with FZK These throughput tests were performed together with Bruno Hoeft. I wrote two scripts which automatically generate the iperf runs and then produce gnuplot graphics from the output file ---++ Conditions <verbatim> traceroute to f01-110-107-e.gridka.de (192.108.45.152), 30 hops max, 38 byte packets 1 148.187.33.2 (148.187.33.2) 0.395 ms 0.396 ms 0.436 ms 2 148.187.32.4 (148.187.32.4) 0.144 ms 0.131 ms 0.143 ms 3 swima2.cscs.ch (148.187.20.2) 0.432 ms 0.421 ms 0.436 ms 4 swiEL2-10GE-1-4.switch.ch (130.59.37.77) 3.245 ms 3.380 ms 3.248 ms 5 swiCE3-10GE-1-3.switch.ch (130.59.37.65) 3.988 ms 3.977 ms 3.988 ms 6 swiCE2-10GE-1-4.switch.ch (130.59.36.209) 4.134 ms 4.124 ms 4.137 ms 7 switch.rt1.gen.ch.geant2.net (62.40.124.21) 4.132 ms 3.977 ms 3.988 ms 8 so-7-2-0.rt1.fra.de.geant2.net (62.40.112.22) 12.123 ms 12.253 ms 12.267 ms 9 dfn-gw.rt1.fra.de.geant2.net (62.40.124.34) 13.357 ms 12.210 ms 12.110 ms 10 xr-fzk1-te2-3.x-win.dfn.de (188.1.145.50) 15.053 ms 15.055 ms 14.922 ms 11 kr-fzk1.g-win.dfn.de (188.1.38.222) 15.203 ms 15.055 ms 15.075 ms 12 * * * 13 f01-110-107-e.gridka.de (192.108.45.152) 14.938 ms 14.842 ms 14.883 ms --- f01-110-107-e.gridka.de ping statistics --- 43 packets transmitted, 43 received, 0% packet loss, time 42417ms rtt min/avg/max/mdev = 14.866/15.028/15.313/0.141 ms, pipe 2 </verbatim> ---++ Influence of TCP window size and number of parallel streams Bruno Hoeft found an optimal throughput of 700 Mbit/sec (with 4 parallel streams and a tcp window size of 4 MB). These runs were performed starting at 2006-12-05 22:54h. There was some load from the worker nodes, but the CPU utilization was quite low. But since =iperf= tests memory to memory, and the cluster bandwidth was not nearly used, the impact can be considered small. <br /><img src="%ATTACHURLPATH%/pIL-TO-192.108.45.152.png" alt="pIL-TO-192.108.45.152.png" width='640' height='480' /> <br /><img src="%ATTACHURLPATH%/pIL-FROM-192.108.45.152.png" alt="pIL-FROM-192.108.45.152.png" width='640' height='480' /> -- Main.DerekFeichtinger - 06 Dec 2006
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