Hi All, Back in http://git.kernel.dk/cgit/fio/commit/?id=c479640d6208236744f0562b1e79535eec290e2b several updates were made for Windows CPU affinity. However, using the cpus_allowed since fio 3.6 and latest git appears to throw error messages. Consider a job: fio --name=test --ioengine=windowsaio --direct=1 --rw=write --overwrite=1 --filename=\\.\PHYSICALDRIVE1 --runtime=1s --thread --cpus_allowed=0-1 --cpus_allowed_policy=shared fio_setaffinity: failed to set thread affinity (pid 2768, group 0, mask 10000, GetLastError=87) fio_setaffinity: failed to set thread affinity (pid 2372, group 0, mask 20000, GetLastError=87) clock setaffinity failed: No error It seems err 87 is ERROR_INVALID_PARAMETER, but any idea why "GROUP_AFFINITY struct's Reserved members are not initialised to 0?" Might it be related to Windows version? Seems to fail on 2012 and 2016. Thanks. Regards, Jeff
