Ticket #36921

Affinity bug

Open Date: 2017-01-06 03:31 Last Update: 2017-01-06 03:31

Reporter: (Anonymous) Owner: hiyohiyo
Type: Bugs Status: Open [Owner assigned]
Component: (None) MileStone: (None)
Priority: 6 Severity: 6
Resolution: None

Details

Please, add the -n parameter to the diskspd command line when 1 thread benchmark is started; this is the way one thread applications run; otherwise the benchmark will be set to run on the CPU 0 (default affinity)

-n disable default affinity (-a)

ashafranov@hotmail.com

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Ticket History (2/2 Histories)

2017-01-06 03:31 Updated by: None
  • New Ticket "Affinity bug" created
2017-05-25 15:55 Updated by: None
Comment

This may be what the original poster found.

This happens only in Windows 10, single thread test and the size of read/write is small. e.g. a lot of random synchronous read. In this case, set the affinity in fact increases the read/write performance. A closer look at it, the average time of Readfile()/Writefile() is shorter with the affinity set.

cj.tsai(at)yandex.com

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