[Mauiusers] bug in multireqs

Garrick Staples garrick at usc.edu
Thu Sep 22 17:14:57 MDT 2005


I've found a miscalculation that is deferring multi-req jobs.

Given 32 dual-proc "singlecore" nodes, and 337 dual-proc "dualcore"
nodes...

This multi-req gets deferred:
  nodes=5:singlecore:ppn=2+333:dualcore:ppn=4

Maui initially finds all of the requested nodes but then fails to count
them up correctly.  It compares the total number requested with the
total number available to the first request.

INFO:     attempting BF backfill with job '408565' (p: 1342 t: 36000)
INFO:     46 feasible tasks found for job 408565:0 in partition DEFAULT (10 Needed)
INFO:     1348 feasible tasks found for job 408565:1 in partition DEFAULT (1332 Needed)
INFO:     located job '408565' in MBFBestFit (size: 1342 duration: 36000)
INFO:     46 feasible tasks found for job 408565:0 in partition DEFAULT (10 Needed)
INFO:     1348 feasible tasks found for job 408565:1 in partition DEFAULT (1332 Needed)
INFO:     inadequate resources found in any set (46 < 1342)
ERROR:     cannot allocate nodes for job '408565' in MBFBestFit


While the numbers are still wrong, '1348 < 1342', this particular
example succeeds by accident if you reverse the request:

  nodes=333:dualcore:ppn=4+5:singlecore

-- 
Garrick Staples, Linux/HPCC Administrator
University of Southern California
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