SLURM priority information
Detailed information on how SLURM assigns priority to jobs can be found here. The basic calculation is described in the table below.
Job_priority = (PriorityWeightAge) * (age_factor) + (PriorityWeightFairshare) * (fair-share_factor) + (PriorityWeightJobSize) * (job_size_factor) + (PriorityWeightPartition) * (partition_factor) + (PriorityWeightQOS) * (QOS_factor) + SUM(TRES_weight_cpu * TRES_factor_cpu, TRES_weight_<type> * TRES_factor_<type>, ...)
"All of the factors in this formula are floating point numbers that range from 0.0 to 1.0. The weights are unsigned, 32 bit integers. The job's priority is an integer that ranges between 0 and 4294967295. The larger the number, the higher the job will be positioned in the queue, and the sooner the job will be scheduled. A job's priority, and hence its order in the queue, can vary over time. For example, the longer a job sits in the queue, the higher its priority will grow when the age_weight is non-zero."[1]
Here is an example priority calculation from the slurmctld.log:
2018-03-29T03:24:54.430] Fairshare priority of job 1601032 for user Cleatus in acct default is 2**(-0.111913/0.002453) = 0.042337 [2018-03-29T03:24:54.430] Weighted Age priority is 0.251721 * 16800 = 4228.92 [2018-03-29T03:24:54.430] Weighted Fairshare priority is 0.042337 * 25000 = 1058.42 [2018-03-29T03:24:54.430] Weighted JobSize priority is 0.996510 * 10000 = 9965.10 [2018-03-29T03:24:54.430] Weighted Partition priority is 0.666667 * 30000 = 20000.00 [2018-03-29T03:24:54.430] Weighted QOS priority is 0.000000 * 25000 = 0.00 [2018-03-29T03:24:54.430] Job 1601032 priority: 4228.92 + 1058.42 + 9965.10 + 20000.00 + 0.00 + 0 - 2500 = 32752.49
See the SLURM button on the left for the sprio man page for more information.
The output below was created with the following command:
sprio -o "%.15i %.8u %.10Y %.10A %.10F %.10J %.10P"
Thu Oct 7 14:45:02 EDT 2021
JOBID USER PRIORITY AGE FAIRSHARE JOBSIZE PARTITION
464859 mdhannig 16324 5164 0 9960 1200
464902 mdhannig 16307 5147 0 9960 1200
464945 mdhannig 16297 5135 0 9963 1200
506208 gandhiz 14953 1684 0 9969 3300
506203 gandhiz 14953 1684 0 9969 3300
506198 gandhiz 14953 1684 0 9969 3300
506193 gandhiz 14953 1684 0 9969 3300
506246 gandhiz 14952 1683 0 9969 3300
506241 gandhiz 14952 1683 0 9969 3300
506236 gandhiz 14952 1683 0 9969 3300
506227 gandhiz 14952 1683 0 9969 3300
506223 gandhiz 14952 1684 0 9969 3300
506218 gandhiz 14952 1684 0 9969 3300
506213 gandhiz 14952 1684 0 9969 3300
506284 gandhiz 14951 1682 0 9969 3300
506280 gandhiz 14951 1682 0 9969 3300
506275 gandhiz 14951 1682 0 9969 3300
506270 gandhiz 14951 1682 0 9969 3300
506265 gandhiz 14951 1682 0 9969 3300
506260 gandhiz 14951 1683 0 9969 3300
506255 gandhiz 14951 1683 0 9969 3300
506251 gandhiz 14951 1683 0 9969 3300
506322 gandhiz 14950 1681 0 9969 3300
506317 gandhiz 14950 1681 0 9969 3300
506312 gandhiz 14950 1681 0 9969 3300
506308 gandhiz 14950 1681 0 9969 3300
506303 gandhiz 14950 1682 0 9969 3300
506294 gandhiz 14950 1682 0 9969 3300
506289 gandhiz 14950 1682 0 9969 3300
506360 gandhiz 14949 1680 0 9969 3300
506351 gandhiz 14949 1680 0 9969 3300
506346 gandhiz 14949 1680 0 9969 3300
506342 gandhiz 14949 1680 0 9969 3300
506337 gandhiz 14949 1681 0 9969 3300
506332 gandhiz 14949 1681 0 9969 3300
506327 gandhiz 14949 1681 0 9969 3300
506394 gandhiz 14948 1679 0 9969 3300
506389 gandhiz 14948 1679 0 9969 3300
506384 gandhiz 14948 1679 0 9969 3300
506379 gandhiz 14948 1679 0 9969 3300
506374 gandhiz 14948 1680 0 9969 3300
506370 gandhiz 14948 1680 0 9969 3300
506365 gandhiz 14948 1680 0 9969 3300
506432 gandhiz 14947 1678 0 9969 3300
506428 gandhiz 14947 1678 0 9969 3300
506423 gandhiz 14947 1678 0 9969 3300
506418 gandhiz 14947 1678 0 9969 3300
506413 gandhiz 14947 1678 0 9969 3300
506408 gandhiz 14947 1679 0 9969 3300
506403 gandhiz 14947 1679 0 9969 3300
506399 gandhiz 14947 1679 0 9969 3300
506465 gandhiz 14946 1677 0 9969 3300
506461 gandhiz 14946 1677 0 9969 3300
506456 gandhiz 14946 1677 0 9969 3300
506451 gandhiz 14946 1677 0 9969 3300
506446 gandhiz 14946 1678 0 9969 3300
506441 gandhiz 14946 1678 0 9969 3300
506508 gandhiz 14945 1676 0 9969 3300
506503 gandhiz 14945 1676 0 9969 3300
506498 gandhiz 14945 1676 0 9969 3300
506493 gandhiz 14945 1676 0 9969 3300
506489 gandhiz 14945 1676 0 9969 3300
506484 gandhiz 14945 1677 0 9969 3300
506475 gandhiz 14945 1677 0 9969 3300
506470 gandhiz 14945 1677 0 9969 3300
506513 gandhiz 14944 1676 0 9969 3300
510396 gandhiz 13700 432 0 9969 3300
510395 gandhiz 13700 432 0 9969 3300
510394 gandhiz 13700 432 0 9969 3300