I'm finding that the throughput is varying wildly during a run - more
than I think is probably normal. It happens regardless of whether I
limit by data rate or io rate, although I think it's worse when I
limit by io.
Here is a test job followed by the output. The io rate fluctuated
wildly - I watched it in the Windows Performance Monitor. The io rate
should be extremely easy to maintain. The "CR=80" looks suspicious -
why is there an 80 there when I requested 40?
BEGIN>>>
[streams]
sync=1
direct=1
bs=4k
thread
size=10M
nrfiles=1
rate_iops=40
rw=read
END>>>
BEGIN>>>
D:\>fio test.ini
streams: (g=0): rw=read, bs=4K-4K/4K-4K, ioengine=windowsaio, iodepth=1
fio-2.0.8-19-g9576
Starting 1 thread
Jobs: 1 (f=1), CR=80/0 IOPS: [R] [100.0% done] [160K/0K /s] [40 /0
iops] [eta 00m:00s]
streams: (groupid=0, jobs=1): err= 0: pid=4888: Sun Aug 19 22:32:01 2012
read : io=10240KB, bw=163898 B/s, iops=40 , runt= 63977msec
slat (usec): min=13 , max=106 , avg=23.81, stdev= 7.43
clat (usec): min=214 , max=26940 , avg=688.03, stdev=1920.57
lat (usec): min=248 , max=26986 , avg=711.84, stdev=1921.02
clat percentiles (usec):
| 1.00th=[ 239], 5.00th=[ 262], 10.00th=[ 266], 20.00th=[ 270],
| 30.00th=[ 274], 40.00th=[ 278], 50.00th=[ 282], 60.00th=[ 286],
| 70.00th=[ 290], 80.00th=[ 302], 90.00th=[ 354], 95.00th=[ 4960],
| 99.00th=[ 5088], 99.50th=[18048], 99.90th=[19328], 99.95th=[19328],
| 99.99th=[27008]
bw (KB/s) : min= 3, max= 961, per=100.00%, avg=218.90, stdev=207.65
lat (usec) : 250=1.80%, 500=89.80%, 750=2.23%
lat (msec) : 10=5.39%, 20=0.74%, 50=0.04%
cpu : usr=0.00%, sys=0.00%, ctx=0, majf=0, minf=0
IO depths : 1=100.0%, 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=2560/w=0/d=0, short=r=0/w=0/d=0
Run status group 0 (all jobs):
READ: io=10240KB, aggrb=160KB/s, minb=160KB/s, maxb=160KB/s,
mint=63977msec, maxt=63977msec
D:\>
END>>>
Windows 7 32-bit.
Greg.
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