Switch Jitter. John Hague IBM consultant Nov/08
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1 Switch Jitter John Hague IBM consultant Nov/8
2 Introduction Investigate Halo exchange time One of simplest communication patterns Expect increase with number of MPI tasks Will not identity cause of jitter Run on P5+ system (hpce) 16 cores per node 2 Federation switch links per node Run on P6 system (c1a) 32 cores per node 8 InfiniBand switch links per node
3 Decomposition Global grid points split into 2D north/south east/west configuration For N MPI tasks Each task allocated set of east/west, north/south grid points Each task bound to core in node N/16 tasks in north south direction 16 tasks in east west direction
4 Halo exchange Halo exchange for each MPI task: Send North Recv North Send West Recv West MPI Task N Send East Recv East Send South Recv South
5 Measurements For Various number of tasks Issue 1 halo calls in each task consisting of Barrier 2 north/south isends, 2 north/south irecvs, wait 2 east/west isends, 2 east/west irecvs, wait Measure each individual halo time on each task Get average MAX time per halo call Take maximum time over all tasks for each call to halo Sum all maximums and take average Get average AVG time per halo call Take average time over all tasks for each call to halo Sum all averages and take average
6 Computation Computation of MAX and AVG Repetition Avg nnn nnn nnn nnn... nnn nnn nnn nnn nnn... nnn Avg aaa aaa aaa aaa... aaa -> AVG Max mmm mmm mmm mmm... mmm -> MAX
7 GB/s per node on P5 (16 nodes, 256 tasks) GB/s per node MAX AVG EAGER LIMIT KB per exchange 2*(2*irecv+2*isend) EAGER_LIMIT=32K
8 Time for 4K exchanges on P5 2 microsec per halo MAX AVG Nodes (16 tasks per node) 2*(2*irecv+2*isend) EAGER_LIMIT=32K
9 Time per call on P5 (64 nodes, 124 tasks, 4K exch) Task Task Task Repetition number
10 Time for 4K exchanges on P microsed per halo MAX AVG Nodes (16 tasks per node) EAGER_LIMIT=32K 2*(2*irecv+2*isend)
11 Difference between AVG and MAX Could be due to Queuing of packets in switch Retransmits in across switch Interference on switch from other programs Interference with poe s/w Why does MAX/AVG increase with number of Nodes? Each exchange takes as long as longest Task If one in 2 exchanges takes double time then with 1 tasks all exchanges will take double time
12 Different Communication Patterns 1. 2*(irecv,isend) barrier irecv north, irecv south, isend north, isend south, wait irecv east, irecv west, isend east, isend west, wait 2. 4*irecv,4*isend barrier irecvs north/south/east/west irecvs isends north/south/east/west isends, wait 3. 4*isend, 4*recv barrier isends north/south/east/west recvs north/south/east/west, wait 4. 4*isend, 4*recv, bunched tasks barrier isends north/south/east/west recvs north/south/east/west, wait
13 Bunching tasks on node Non bunched tasks Off node communication = 32 send/recvs Node Bunched Tasks Off node communication = 16 send/recvs Node
14 Time for 4K exchanges on P5: 16 nodes, 256 tasks 12 1 MAX-AVG AVG microsec per halo EAGER_LIMIT=32K EAGER_LIMIT=64K 1: 2*(2*irecv,2*isend) 2: 4*irecv,4*isend 3: 4*isend,4*recv 4: 4*isend,4*recv bunched tasks
15 Time for 4K exchanges on P MAX AVG microsec per halo Nodes (16 tasks per node) EAGER_LIMIT=64K 4*isend,4*recv bunched tasks
16 Time per call on P5 (64 nodes, 124 tasks, 4K exch) Task Task Task Repetition number
17 Time for 4K halo exchanges on P MAX AVG microsec per halo Nodes (16 tasks per node) EAGER_LIMIT=64K 4*isend,4*recv bunched tasks
18 Time per halo on P6 (32 nodes, 512 tasks, 4k exch) Task Task Task Repetition number
19 Time per halo on P6 (12 nodes, 192 tasks, 4k exch) Task Task Task Repetition number
20 Max time per halo on P6 (12 nodes, 192 tasks, 4k exch) All Tasks Repetition number
21 Max time per halo on P6 (12 nodes, 192 tasks, 4k exch) All Tasks Repetition number
22 Conclusions For Halo exchange: Can get factor of 2 improvement by optimisation: Combine exchanges Set environment variables (e.g. MP_EAGER_LIMIT) Communication pattern Task placement (bunching) What next? Node allocation Application changes (e.g. computation/communication overlap) Reduce jitter which will be done
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