[slurm-users] [Slurm 18.08.4] sacct/seff Inaccurate usercpu on Job Arrays

[Chance Bryce Carl Nelson]

Hi folks,

calling sacct with the usercpu flag enabled seems to provide cpu times far
above expected values for job array indices. This is also reported by seff.
For example, executing the following job script:
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#!/bin/bash
#SBATCH --job-name=array_test
#SBATCH --workdir=/scratch/cbn35/bigdata
#SBATCH --output=/scratch/cbn35/bigdata/logs/job_%A_%a.log
#SBATCH --time=20:00
#SBATCH --array=1-5
#SBATCH -c2

srun stress -c 2 -m 1 --vm-bytes 500M --timeout 65s

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...results in the following stats:
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       JobID  ReqCPUS    UserCPU  Timelimit    Elapsed
------------ -------- ---------- ---------- ----------
15730924_5          2   02:30:14   00:20:00   00:01:08
15730924_5.+        2  00:00.004              00:01:08
15730924_5.+        2   00:00:00              00:01:09
15730924_5.0        2   02:30:14              00:01:05
15730924_1          2   02:30:48   00:20:00   00:01:08
15730924_1.+        2  00:00.013              00:01:08
15730924_1.+        2   00:00:00              00:01:09
15730924_1.0        2   02:30:48              00:01:05
15730924_2          2   02:15:52   00:20:00   00:01:07
15730924_2.+        2  00:00.007              00:01:07
15730924_2.+        2   00:00:00              00:01:07
15730924_2.0        2   02:15:52              00:01:06
15730924_3          2   02:30:20   00:20:00   00:01:08
15730924_3.+        2  00:00.010              00:01:08
15730924_3.+        2   00:00:00              00:01:09
15730924_3.0        2   02:30:20              00:01:05
15730924_4          2   02:30:26   00:20:00   00:01:08
15730924_4.+        2  00:00.006              00:01:08
15730924_4.+        2   00:00:00              00:01:09
15730924_4.0        2   02:30:25              00:01:05

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This is also reported by seff, with several errors to boot:
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Use of uninitialized value $lmem in numeric lt (<) at /usr/bin/seff line
130, <DATA> line 624.
Use of uninitialized value $lmem in numeric lt (<) at /usr/bin/seff line
130, <DATA> line 624.
Use of uninitialized value $lmem in numeric lt (<) at /usr/bin/seff line
130, <DATA> line 624.
Job ID: 15730924
Array Job ID: 15730924_5
Cluster: monsoon
User/Group: cbn35/clusterstu
State: COMPLETED (exit code 0)
Nodes: 1
Cores per node: 2
CPU Utilized: 03:19:15
CPU Efficiency: 8790.44% of 00:02:16 core-walltime
Job Wall-clock time: 00:01:08
Memory Utilized: 0.00 MB (estimated maximum)
Memory Efficiency: 0.00% of 1.95 GB (1000.00 MB/core)

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As far as I can tell, I don't think a two core job with an elapsed time of
around one minute would have a cpu time of two hours. Could this be a
configuration issue, or is it a possible bug?

More info is available on request, and any help is appreciated!
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