Hi, Dave,
I read the mail you post for "fs-writeback: drop wb->list_lock during
blk_finish_plug()", and I
adore you very much.
I'm very curious that how you get the writeback status when running fs_mark.
I will appreciate very much if you can share the way you get writeback
status and iops, etc.
And maybe people in community can use this way to do the same tests as you.
The following is a part copy of the test result you got:
$ ~/tests/fsmark-10-4-test-xfs.sh
meta-data=/dev/vdc isize=512 agcount=500, agsize=268435455 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=0
data = bsize=4096 blocks=134217727500, imaxpct=1
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=131072, version=2
= sectsz=512 sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
# ./fs_mark -D 10000 -S0 -n 10000 -s 4096 -L 120 -d
/mnt/scratch/0 -d /mnt/scratch/1 -d /mnt/scratch/2 -d
/mnt/scratch/3 -d /mnt/scratch/4 -d /mnt/scratch/5 -d
/mnt/scratch/6 -d /mnt/scratch/7
# Version 3.3, 8 thread(s) starting at Thu Sep 17 08:08:36 2015
# Sync method: NO SYNC: Test does not issue sync() or fsync() calls.
# Directories: Time based hash between directories across 10000
subdirectories with 180 seconds per subdirectory.
# File names: 40 bytes long, (16 initial bytes of time stamp
with 24 random bytes at end of name)
# Files info: size 4096 bytes, written with an IO size of 16384
bytes per write
# App overhead is time in microseconds spent in the test not
doing file writing related system calls.
FSUse% Count Size Files/sec App Overhead
0 80000 4096 106938.0 543310
0 160000 4096 102922.7 476362
0 240000 4096 107182.9 538206
0 320000 4096 107871.7 619821
0 400000 4096 99255.6 622021
0 480000 4096 103217.8 609943
0 560000 4096 96544.2 640988
0 640000 4096 100347.3 676237
0 720000 4096 87534.8 483495
0 800000 4096 72577.5 2556920
0 880000 4096 97569.0 646996
<RAM fills here, sustained performance is now dependent on writeback>
0 960000 4096 80147.0 515679
0 1040000 4096 100394.2 816979
0 1120000 4096 91466.5 739009
0 1200000 4096 85868.1 977506
0 1280000 4096 89691.5 715207
0 1360000 4096 52547.5 712810
0 1440000 4096 47999.1 685282
0 1520000 4096 47894.3 697261
0 1600000 4096 47549.4 789977
0 1680000 4096 40029.2 677885
0 1760000 4096 16637.4 12804557
0 1840000 4096 16883.6 24295975
thanks
George
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