[Mauiusers] bug in multireqs

Garrick Staples garrick at usc.edu
Fri Sep 23 00:51:13 MDT 2005


This might be related...

Given 'nodes=5:dualcore+5:singlecore' and 'resources_default.neednodes =
bench' on the PBS queue, notice the missing feature in the second req:

Req[0]  TaskCount: 5  Partition: ALL
Network: [NONE]  Memory >= 0  Disk >= 0  Swap >= 0
Opsys: [NONE]  Arch: [NONE]  Features: [bench][dualcore]
NodeCount: 5

Req[1]  TaskCount: 5  Partition: ALL
Network: [NONE]  Memory >= 0  Disk >= 0  Swap >= 0
Opsys: [NONE]  Arch: [NONE]  Features: [singlecore]
NodeCount: 5


On Thu, Sep 22, 2005 at 04:14:57PM -0700, Garrick Staples alleged:
> 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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-- 
Garrick Staples, Linux/HPCC Administrator
University of Southern California
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