I just tried the code from git on my personal macbook.
I replaced libaio with posixaio in the config file and
the ultra-high aggrb read is there too (files being created).
is caused by the contribution to the aggregate stats
of the second of the two query threads [queryB]
edoardos-macbook-pro:devel edoardo$ sudo fio four-threads-randio-016.fio
fio: this platform does not support process shared mutexes, forcing use of
threads. Use the 'thread' option to get rid of this warning.
bgwriter: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio,
iodepth=32
fio: this platform does not support process shared mutexes, forcing use of
threads. Use the 'thread' option to get rid of this warning.
queryA: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=mmap, iodepth=1
fio: this platform does not support process shared mutexes, forcing use of
threads. Use the 'thread' option to get rid of this warning.
queryB: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=mmap, iodepth=1
fio: this platform does not support process shared mutexes, forcing use of
threads. Use the 'thread' option to get rid of this warning.
bgupdater: (g=0): rw=randrw, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio,
iodepth=16
fio-2.1-8-gb2c77
Starting 4 threads
bgwriter: Laying out IO file(s) (1 file(s) / 256MB)
queryA: Laying out IO file(s) (1 file(s) / 256MB)
queryB: Laying out IO file(s) (1 file(s) / 256MB)
bgupdater: Laying out IO file(s) (1 file(s) / 64MB)
Jobs: 1 (f=1): [___m] [26.9% done] [170.4MB/342KB/0KB /s] [43.6K/85/0
iops] [eta 02m:59s]
bgwriter: (groupid=0, jobs=1): err= 0: pid=4611: Sat May 18 23:38:37 2013
write: io=9632.0KB, bw=164145B/s, iops=39, runt= 60088msec
slat (usec): min=0, max=3804, avg= 4.82, stdev=74.40
clat (msec): min=6, max=1308, avg=376.14, stdev=137.62
lat (msec): min=6, max=1308, avg=376.15, stdev=137.61
bw (KB /s): min= 1, max= 456, per=94.60%, avg=158.93, stdev=47.60
lat (msec) : 10=0.08%, 50=0.17%, 100=1.38%, 250=9.82%, 500=77.03%
lat (msec) : 750=10.86%, 1000=0.50%, 2000=0.71%
cpu : usr=66.60%, sys=34.47%, ctx=70482, majf=2210,
minf=4379188
IO depths : 1=0.1%, 2=0.1%, 4=0.3%, 8=109.0%, 16=2.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=99.9%, 8=0.1%, 16=0.1%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued : total=r=0/w=2394/d=0, short=r=0/w=0/d=0
queryA: (groupid=0, jobs=1): err= 0: pid=4867: Sat May 18 23:38:37 2013
read : io=36340KB, bw=620037B/s, iops=151, runt= 60016msec
clat (usec): min=6, max=446986, avg=6596.70, stdev=15779.91
lat (usec): min=6, max=446987, avg=6597.95, stdev=15780.52
bw (KB /s): min= 0, max= 1773, per=0.22%, avg=601.57, stdev=232.79
lat (usec) : 10=64.65%, 20=11.88%, 50=0.57%, 100=0.26%, 250=0.30%
lat (usec) : 500=0.08%, 750=0.17%, 1000=0.64%
lat (msec) : 2=0.20%, 4=0.19%, 10=1.66%, 20=1.44%, 50=17.56%
lat (msec) : 100=0.32%, 250=0.04%, 500=0.06%
cpu : usr=66.68%, sys=34.51%, ctx=70432, majf=2210,
minf=4379191
IO depths : 1=109.9%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued : total=r=9085/w=0/d=0, short=r=0/w=0/d=0
queryB: (groupid=0, jobs=1): err= 0: pid=5123: Sat May 18 23:38:37 2013
read : io=16314MB, bw=278418KB/s, iops=69604, runt= 60001msec
clat (usec): min=0, max=23157, avg= 7.17, stdev=36.81
lat (usec): min=0, max=23158, avg= 7.77, stdev=37.02
bw (KB /s): min= 0, max=313216, per=99.38%, avg=276190.69,
stdev=34663.74
lat (usec) : 2=0.01%, 4=0.01%, 10=98.91%, 20=0.65%, 50=0.17%
lat (usec) : 100=0.13%, 250=0.09%, 500=0.02%, 750=0.01%, 1000=0.01%
lat (msec) : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.01%
cpu : usr=66.70%, sys=34.52%, ctx=70426, majf=2209,
minf=4379192
IO depths : 1=109.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued : total=r=4176340/w=0/d=0, short=r=0/w=0/d=0
bgupdater: (groupid=0, jobs=1): err= 0: pid=5379: Sat May 18 23:38:37 2013
read : io=663552B, bw=11015B/s, iops=2, runt= 60240msec
slat (usec): min=1, max=128, avg= 6.28, stdev=10.86
clat (usec): min=2, max=628813, avg=193318.38, stdev=145748.34
lat (usec): min=11, max=628817, avg=193324.99, stdev=145743.69
bw (KB /s): min= 2, max= 396, per=0.00%, avg=13.24, stdev=44.04
write: io=544768B, bw=9043B/s, iops=2, runt= 60240msec
slat (usec): min=1, max=301, avg=16.59, stdev=41.75
clat (usec): min=2, max=1131.3K, avg=207503.18, stdev=201150.42
lat (usec): min=15, max=1131.3K, avg=207521.24, stdev=201134.90
bw (KB /s): min= 0, max= 357, per=7.78%, avg=13.06, stdev=43.83
lat (usec) : 4=14.58%, 10=4.41%, 20=2.71%, 50=2.71%, 100=0.68%
lat (usec) : 500=0.34%
lat (msec) : 4=1.36%, 10=4.75%, 20=0.68%, 50=0.34%, 100=2.03%
lat (msec) : 250=14.92%, 500=48.14%, 750=1.36%, 1000=0.34%, 2000=0.68%
cpu : usr=66.44%, sys=34.39%, ctx=70611, majf=2210,
minf=4379189
IO depths : 1=107.8%, 2=0.7%, 4=1.4%, 8=0.3%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued : total=r=162/w=133/d=0, short=r=0/w=0/d=0
Run status group 0 (all jobs):
READ: io=16350MB, aggrb=277927KB/s, minb=10KB/s, maxb=278418KB/s,
mint=60001msec, maxt=60240msec
WRITE: io=10164KB, aggrb=168KB/s, minb=8KB/s, maxb=160KB/s,
mint=60088msec, maxt=60240msec
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