Am 11.02.2015 um 05:45 schrieb Mark Nelson:
On 02/10/2015 04:18 PM, Stefan Priebe wrote:Am 10.02.2015 um 22:38 schrieb Mark Nelson:On 02/10/2015 03:11 PM, Stefan Priebe wrote:mhm i installed librbd1-dbg and librados2-dbg - but the output still looks useless to me. Should i upload it somewhere?Meh, if it's all just symbols it's probably not that helpful. I've summarized your results here: 1 concurrent 4k write (libaio, direct=1, iodepth=1) IOPS Latency wb on wb off wb on wb off dumpling 10870 536 ~100us ~2ms firefly 10350 525 ~100us ~2ms So in single op tests dumpling and firefly are far closer. Now let's see each of these cases with iodepth=32 (still 1 thread for now).dumpling: file1: (g=0): rw=randwrite, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=32 2.0.8 Starting 1 thread Jobs: 1 (f=1): [w] [100.0% done] [0K/72812K /s] [0 /18.3K iops] [eta 00m:00s] file1: (groupid=0, jobs=1): err= 0: pid=3011 write: io=2060.6MB, bw=70329KB/s, iops=17582 , runt= 30001msec slat (usec): min=1 , max=3517 , avg= 3.42, stdev= 7.30 clat (usec): min=93 , max=7475 , avg=1815.72, stdev=233.43 lat (usec): min=219 , max=7477 , avg=1819.27, stdev=233.52 clat percentiles (usec): | 1.00th=[ 1480], 5.00th=[ 1576], 10.00th=[ 1608], 20.00th=[ 1672], | 30.00th=[ 1704], 40.00th=[ 1752], 50.00th=[ 1800], 60.00th=[ 1832], | 70.00th=[ 1896], 80.00th=[ 1960], 90.00th=[ 2064], 95.00th=[ 2128], | 99.00th=[ 2352], 99.50th=[ 2448], 99.90th=[ 4704], 99.95th=[ 5344], | 99.99th=[ 7072] bw (KB/s) : min=59696, max=77840, per=100.00%, avg=70351.27, stdev=4783.25 lat (usec) : 100=0.01%, 250=0.01%, 500=0.01%, 750=0.01%, 1000=0.53% lat (msec) : 2=85.02%, 4=14.31%, 10=0.13% cpu : usr=1.96%, sys=6.71%, ctx=22791, majf=0, minf=133 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=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=0.1%, 64=0.0%, >=64=0.0% issued : total=r=0/w=527487/d=0, short=r=0/w=0/d=0 Run status group 0 (all jobs): WRITE: io=2060.6MB, aggrb=70329KB/s, minb=70329KB/s, maxb=70329KB/s, mint=30001msec, maxt=30001msec Disk stats (read/write): sdb: ios=166/526079, merge=0/0, ticks=24/890120, in_queue=890064, util=98.73% firefly: file1: (g=0): rw=randwrite, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=32 2.0.8 Starting 1 thread Jobs: 1 (f=1): [w] [100.0% done] [0K/69096K /s] [0 /17.3K iops] [eta 00m:00s] file1: (groupid=0, jobs=1): err= 0: pid=2982 write: io=1784.9MB, bw=60918KB/s, iops=15229 , runt= 30002msec slat (usec): min=1 , max=1389 , avg= 3.43, stdev= 5.32 clat (usec): min=117 , max=8235 , avg=2096.88, stdev=396.30 lat (usec): min=540 , max=8258 , avg=2100.43, stdev=396.61 clat percentiles (usec): | 1.00th=[ 1608], 5.00th=[ 1720], 10.00th=[ 1768], 20.00th=[ 1832], | 30.00th=[ 1896], 40.00th=[ 1944], 50.00th=[ 2008], 60.00th=[ 2064], | 70.00th=[ 2160], 80.00th=[ 2256], 90.00th=[ 2512], 95.00th=[ 2896], | 99.00th=[ 3600], 99.50th=[ 3792], 99.90th=[ 5088], 99.95th=[ 6304], | 99.99th=[ 6752] bw (KB/s) : min=36717, max=73712, per=99.94%, avg=60879.92, stdev=8302.27 lat (usec) : 250=0.01%, 750=0.01% lat (msec) : 2=48.56%, 4=51.18%, 10=0.26% cpu : usr=2.03%, sys=5.48%, ctx=20440, majf=0, minf=133 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%, >=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=0.1%, 64=0.0%, >=64=0.0% issued : total=r=0/w=456918/d=0, short=r=0/w=0/d=0 Run status group 0 (all jobs): WRITE: io=1784.9MB, aggrb=60918KB/s, minb=60918KB/s, maxb=60918KB/s, mint=30002msec, maxt=30002msec Disk stats (read/write): sdb: ios=166/455574, merge=0/0, ticks=12/897748, in_queue=897696, util=98.96%Ok, so it looks like as you increase concurrency the effect increases (ie contention?). Does the same thing happen without cache enabled?
here again without rbd cache: dumpling: file1: (g=0): rw=randwrite, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=32 2.0.8 Starting 1 threadJobs: 1 (f=1): [w] [100.0% done] [0K/83488K /s] [0 /20.9K iops] [eta 00m:00s]
file1: (groupid=0, jobs=1): err= 0: pid=3000
write: io=2449.2MB, bw=83583KB/s, iops=20895 , runt= 30005msec
slat (usec): min=1 , max=975 , avg= 4.50, stdev= 5.25
clat (usec): min=364 , max=80566 , avg=1525.87, stdev=1194.57
lat (usec): min=519 , max=80568 , avg=1530.51, stdev=1194.44
clat percentiles (usec):
| 1.00th=[ 660], 5.00th=[ 780], 10.00th=[ 876], 20.00th=[ 1032],
| 30.00th=[ 1144], 40.00th=[ 1240], 50.00th=[ 1304], 60.00th=[ 1384],
| 70.00th=[ 1480], 80.00th=[ 1640], 90.00th=[ 2096], 95.00th=[ 2960],
| 99.00th=[ 6816], 99.50th=[ 7840], 99.90th=[11712], 99.95th=[13888],
| 99.99th=[18816]
bw (KB/s) : min=47184, max=95432, per=100.00%, avg=83639.19,
stdev=7973.92
lat (usec) : 500=0.01%, 750=3.82%, 1000=14.40%
lat (msec) : 2=70.57%, 4=7.91%, 10=3.11%, 20=0.17%, 50=0.01%
lat (msec) : 100=0.01%
cpu : usr=3.12%, sys=11.49%, ctx=74951, majf=0, minf=133
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%,
>=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=0.1%, 64=0.0%,
>=64=0.0%
issued : total=r=0/w=626979/d=0, short=r=0/w=0/d=0
Run status group 0 (all jobs):
WRITE: io=2449.2MB, aggrb=83583KB/s, minb=83583KB/s, maxb=83583KB/s,
mint=30005msec, maxt=30005msec
Disk stats (read/write):sdb: ios=168/625292, merge=0/0, ticks=144/916096, in_queue=916128, util=99.93%
firefly:fio --filename=/dev/sdb --direct=1 --rw=randwrite --bs=4k --numjobs=1 --thread --iodepth=32 --ioengine=libaio --runtime=30 --group_reporting --name=file1
file1: (g=0): rw=randwrite, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=32 2.0.8 Starting 1 threadJobs: 1 (f=1): [w] [100.0% done] [0K/90044K /s] [0 /22.6K iops] [eta 00m:00s]
file1: (groupid=0, jobs=1): err= 0: pid=2970
write: io=2372.9MB, bw=80976KB/s, iops=20244 , runt= 30006msec
slat (usec): min=1 , max=4047 , avg= 4.36, stdev= 7.17
clat (usec): min=197 , max=76656 , avg=1575.29, stdev=1165.74
lat (usec): min=523 , max=76660 , avg=1579.79, stdev=1165.59
clat percentiles (usec):
| 1.00th=[ 676], 5.00th=[ 804], 10.00th=[ 916], 20.00th=[ 1096],
| 30.00th=[ 1224], 40.00th=[ 1304], 50.00th=[ 1384], 60.00th=[ 1448],
| 70.00th=[ 1544], 80.00th=[ 1704], 90.00th=[ 2128], 95.00th=[ 2736],
| 99.00th=[ 6752], 99.50th=[ 7904], 99.90th=[12096], 99.95th=[14656],
| 99.99th=[18560]
bw (KB/s) : min=47800, max=91952, per=99.91%, avg=80900.88,
stdev=7234.98
lat (usec) : 250=0.01%, 500=0.01%, 750=2.95%, 1000=11.38%
lat (msec) : 2=73.81%, 4=8.81%, 10=2.85%, 20=0.19%, 50=0.01%
lat (msec) : 100=0.01%
cpu : usr=2.99%, sys=10.60%, ctx=66549, majf=0, minf=133
IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=100.0%,
>=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=0.1%, 64=0.0%,
>=64=0.0%
issued : total=r=0/w=607445/d=0, short=r=0/w=0/d=0
Run status group 0 (all jobs):
WRITE: io=2372.9MB, aggrb=80976KB/s, minb=80976KB/s, maxb=80976KB/s,
mint=30006msec, maxt=30006msec
Disk stats (read/write):sdb: ios=170/605440, merge=0/0, ticks=156/916492, in_queue=916560, util=99.93%
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