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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"trying to understand gpcnet output","articleBody":"Hello,\r\n\r\nI got the table from below after running network_test.\r\n\r\nI have two questions:\r\n\r\n1. What is the meaning of Avg(Worst) column\r\n2. How is possible to have for Multiple Allreduce the 99% and 99.9% percentile values outside the min-max range?\r\n\r\nKind regards,\r\n\r\nLucian Anton\r\n \r\n\r\n\r\n```\r\nNetwork Tests v1.3\r\n  Test with 14320 MPI ranks (1790 nodes)\r\n\r\n  Legend\r\n   RR = random ring communication pattern\r\n   Nat = natural ring communication pattern\r\n   Lat = latency\r\n   BW = bandwidth\r\n   BW+Sync = bandwidth with barrier\r\n+------------------------------------------------------------------------------------------------------------------------------------------+\r\n|                                                          Isolated Network Tests                                                          |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|                            Name |          Min |          Max |          Avg |   Avg(Worst) |          99% |        99.9% |        Units |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|          RR Two-sided Lat (8 B) |          1.2 |         22.2 |          1.5 |          4.7 |          3.6 |          5.1 |         usec |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|                RR Get Lat (8 B) |          1.3 |         22.3 |          1.9 |          3.7 |          2.2 |          3.6 |         usec |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|      RR Two-sided BW (131072 B) |        549.7 |       3015.1 |       1199.2 |        764.5 |        460.4 |        335.0 |   MiB/s/rank |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|            RR Put BW (131072 B) |          7.4 |      22134.8 |       2598.8 |          7.4 |          0.9 |          0.9 |   MiB/s/rank |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n| RR Two-sided BW+Sync (131072 B) |        336.2 |       2031.9 |        916.5 |        769.7 |        335.5 |        186.9 |   MiB/s/rank |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|     Nat Two-sided BW (131072 B) |        650.0 |       4913.7 |       1899.5 |       1124.1 |       1142.5 |        883.4 |   MiB/s/rank |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|        Multiple Allreduce (8 B) |         37.3 |         78.3 |         45.5 |         78.3 |        113.3 |        999.9 |         usec |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|      Multiple Alltoall (4096 B) |        838.9 |       1003.9 |        901.6 |        838.9 |        479.3 |        186.3 |   MiB/s/rank |\r\n+---------------------------------+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n```\r\n","author":{"url":"https://github.com/antonl321","@type":"Person","name":"antonl321"},"datePublished":"2022-01-25T17:04:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/8/GPCNET/issues/8"}