README: Add CPU usage to example
Signed-off-by: Mark Nelson <mnelson@redhat.com>master
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@ -165,3 +165,10 @@ $ ./hsbench -a <access key> -s <secret key> -u http://127.0.0.1:7480 -z 4K -d 10
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2019/08/15 18:33:05 Loop: 0, Int: ALL, Dur(s): 0.1, Mode: BDEL, Ops: 10, MB/s: 0.00, IO/s: 133, Lat(ms): [ min: 54.1, avg: 68.9, 99%: 75.2, max: 75.2 ], Slowdowns: 0
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```
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One notable point is that like the s3-benchmark program it is based on, hsbench has relatively low CPU overhead compared to some other S3 benchmarks. During the 4K PUT phase of the above test:
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```
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22628 root 20 0 6700416 5.308g 28072 S 413.3 8.4 676:28.86 ceph-osd
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23329 root 20 0 1658700 253068 21320 S 333.3 0.4 530:06.76 radosgw
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9017 perf 20 0 2184580 33612 6568 S 173.3 0.1 0:05.25 hsbench
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```
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