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to run this test, it was not completing in a sane amount of >> time - it was taking many minutes before I gave up. > Hi John, Shinichiro, Darrick. > > Thanks for looking into this. Sorry, I'm on vacation so a bit slow in > responding. > > Anyways, the logic behind the filesize calculation is that we want each > thread to do 100 atomic writes in their own isolated ranges in the file. > But seems like it is being especially slow when we have high CPUs. It's not just the number of CPUs which is the problem. The test does the awu max size writes - for XFS, this size can be many MBs, and not like typically < 100 KBs for any FS which relies only on HW-based atomic writes, i.e. ext4. Please also consider limiting the awu max size. > > I think in that sense, it'll be better to limit the threads itself > rather than filesize. Since its a stress test we dont want it to be too > less. Maybe: > > diff --git a/tests/generic/774 b/tests/generic/774 > index 7a4d7016..c68fb4b7 100755 > --- a/tests/generic/774 > +++ b/tests/generic/774 > @@ -28,7 +28,7 @@ awu_max_write=$(_get_atomic_write_unit_max "$SCRATCH_MNT/f1") > aw_bsize=$(_max "$awu_min_write" "$((awu_max_write/4))") > fsbsize=$(_get_block_size $SCRATCH_MNT) > > -threads=$(_min "$(($(nproc) * 2 * LOAD_FACTOR))" "100") > +threads=$(_min "$(($(nproc) * 2 * LOAD_FACTOR))" "16") > filesize=$((aw_bsize * threads * 100)) > depth=$threads > aw_io_size=$((filesize / threads)) > > Can you check if this helps?