bugGNU Octave - Bugs: bug #63939, strange performance of sparse...

 
 

bug #63939: strange performance of sparse matrix operations

Submitter:  Andreas Stahel <andreasstahel>
Submitted:  Fri 17 Mar 2023 03:54:25 PM UTC
 
Category:  Performance Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Performance
Status:  None Assigned to:  None
Originator Name:  Andreas Stahel Open/Closed:  * Open
Release:  * 8.1.0 Operating System:  * GNU/Linux
Fixed Release:  None Planned Release:  None
* Mandatory Fields

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Fri 17 Mar 2023 04:24:03 PM UTC, comment #1: 
Markus M├╝tzel <mmuetzel>
Project Member
Fri 17 Mar 2023 03:54:25 PM UTC, original submission:  

On a tight loop with sparse matrices
(one matrix*vector, one system solve by \, both with the same matrix)
the results depends in a stange way on value OMP_NUM_THREADS=32
Octave with GUI started.

export OMP_NUM_THREADS=32
leads to 25 seconds of wall time

export OMP_NUM_THREADS=16
leads to 5 seconds of wall time

CPU: AMD Ryzen 9 3950X 16-Core Processor,
hyperthreading enabled, i.e. the OS sees 32 cores, 64GB RAM
Xubuntu 22.04

The development version and 8.1.0 lead to the same results

Andreas Stahel <andreasstahel>

 

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Attached Files
file #54507:  TestSparse.m added by andreasstahel (485B - text/x-objcsrc)

 

Depends on the following items: None found

Items that depend on this one: None found

 

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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2023-03-17 andreasstahel Attached File- Added TestSparse.m, #54507

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