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--- cluster:208 [2022/05/26 18:56] – [gpu testing] hmeij07
+++ cluster:208 [2022/11/02 17:28] (current) – [gpu testing] hmeij07
@@ Line 385: / Line 385: @@
 ===== gpu testing =====
-  * n33 only, 4 gpus, 16 cores, 16 threads, 32 cpus
+  * test standalone slurm v 21.08.1
+  * n33-n37 each: 4 gpus, 16 cores, 16 threads, 32 cpus
   * submit one at a time, observe
-  * part=test, n 1, B 1:1:1, cuda_visible=0, no node specified
+  * part=test, n 1, B 1:1:1, cuda_visible=0, no node specified, n33 only
-  * "resources" reason at 17th submit, out of 16 cores and 16 threads
+  * "resources" reason at 17th submit, used up 16 cores and 16 threads
   * all on same gpu
+  * part=test, n 1, B 1:1:1, cuda_visible not set, no node specified, n33 only
+  * "resources" reason at 17th submit too, same reason
+  * all gpus used? nope, all on the same one 0
+  * redoing above with a  ''export CUDA_VISIBLE_DEVICES=`shuf -i 0-3 -n 1`''
+  * even distribution across all gpus, 17th submit reason too
+  * part=test, n 1, B 1:1:1, cuda_visible not set, no node specified, n[33-34] avail
+  * while submitting 34 jobs, one at a time (30s delay), slurm fills up n33 first (all on gpu 0)
+  * 17th submit goes to n34, gpu 1 (weird), n33 state=alloc, n34 state=mix
+  * 33th job, "Resources" reason, job pending
+  * 34th job, "Priority" reason (?), job pending
+  * all n33 and n34 jobs on single gpu without cuda_visible set
+  * how that works with gpu util at 100% with one jobs is beyond me
+  * do all 16 jobs log the same wall time? Yes, between 10.10 and 10.70 hours.
+  * ohpc v2.4 slurm v 20.11.8
+  * part=test, n 1, B 1:1:1, cuda_visible=0, no node specified, n100 only
+  * hit a bug, you must specify cpus-per-gpu **and** mem-per-gpu
+  * then slurm detects 4 gpus on allocated node and allows 4 jobs on a single allocated gpu
+  * twisted logic
+  * so recent openhpc version but old slurm version in software stack
+  * trying standalone install on openhpc prod cluster - auth/munge error, no go
+  * do all 4 jobs have similar wall time? Yes on n100 varies from 0.6 to 0.7 hours
+  * ohpc v2.4 slurm v 20.11.8
+  * part=test, n 1, B 1:1:1, cuda_visible=0, no node specified, n78 only
+  * same as above but all 16 jobs run on gpu 0
+  * so the limit to 4 jobs on rtx5000 gpu is a hardware phenomenon?
+  * all 16 jobs finished, waal times of 3.11 to 3.60 hours
+===== gpu testing 2 =====
+Newer 2022 version seems to have reversed the override options for oversubscribe. So here is our testing...back to CR_CPU_Memory and OverSubscribe=No   --- //[[hmeij@wesleyan.edu|Henk]] 2022/11/02 13:23//
+<code>
+CR_Socket_Memory
+PartitionName=test Nodes=n[100-101]
+Default=YES MaxTime=INFINITE State=UP
+OverSubscribe=No DefCpuPerGPU=12
+MPI jobs with -N 1, -n 8 and -B 2:4:1
+no override options, cpus=48
+--mem=2048, cpus=48
+and --cpus-per-task=1, cpus=48
+and  --ntasks-per-node=8, cpus=24
+MPI jobs with -N, -n 8 and -B 1:8:1
+--mem=10240 cpus=48
+and --cpus-per-task=1, cpus=48
+and  --ntasks-per-node=8, cpus=24
+GPU jobs with -N 1, -n 1 and -B 1:1:1
+no override options, no cuda export, cpus=48
+--cpus-per-gpu=1, cpus=24
+and --mem-per-gpu=7168, cpus=1 (pending
+while other gpu runs in queue but gpus are free???)
+GPU jobs with -N 1, -n 1 and -B 1:1:1
+no override options, yes cuda export, cpus=48
+--cpus-per-gpu=1, cpus=24
+and --mem-per-gpu=7168, cpus=1 (resources pending
+while a gpu job runs, gpus are free, then it executes)
+...suddenly the cpus=1 turns into cpus=24
+when submitting, slurm confused becuase of all
+the job cancellations?
+CR_CPU_Memory test=no, mwgpu=force:16
+PartitionName=test Nodes=n[100-101]
+Default=YES MaxTime=INFINITE State=UP
+OverSubscribe=No DefCpuPerGPU=12
+MPI jobs with -N 1, -n 8 and -B 2:4:1
+no override options, cpus=8 (queue fills across nodes,
+but only one job per node, test & mwgpu)
+--mem=1024, cpus=8 (queue fills first node ...,
+but only three jobs per node, test 3x8=24 full 4th job pending &
+mwgpu 17th job goes pending on n33, overloaded with -n 8 !!)
+(not needed) --cpus-per-task=?, cpus=
+(not needed)  --ntasks-per-node=?, cpus=
+GPU jobs with -N 1, -n 1 and -B 1:1:1 on test
+no override options, no cuda export, cpus=12 (one gpu per node)
+--cpus-per-gpu=1, cpus=1 (one gpu per node)
+and --mem-per-gpu=7168, cpus=1 (both override options
+required else all mem allocated!, max 4 jobs per node,
+fills first node first...cuda export not needed)
+with cuda export, same node, same gpu,
+with "no" enabled multiple jobs per gpu not accepted
+GPU jobs with -N 1, -n 1 and -B 1:1:1 on mwgpu
+--cpus-per-gpu=1,
+and --mem-per-gpu=7168, cpus=1
+(same node, same gpu, cuda export set,
+with "force:16" enabled 4 jobs per gpu accepted,
+potential for overloading!)
+</code>
 ===== Changes =====