> What is the IO size? ÂIs write_test_data synchronous?
>
> For simple write benchmarking you can also use
> Â Â Â Ârados mkpool foo
> Â Â Â Ârados -p foo bench <seconds> write -b <blocksize> -t <threads>
>
> and you'll see latency and throughput. ÂBlocksize defaults to 4M and
> "threads" (parallel IOs) default to 16, IIRC.
Hi, Sage:
I just did the bench:
rados -p rbd bench 60 write -t 64  and  Ârados -p data bench 60 write -t 64
the avg throughput is about 46MB/s, one of the result is as follow.
But why it's slow with rbd api from <rbd/librbd.h>?
And I tried testlibrbdpp.cc, the result is more or less the same.
The attachments are the test codes. Could you run it on your platform please?
Âsec Cur ops  started Âfinished Âavg MB/s Âcur MB/s Âlast lat  avg lat
 40   Â63    482    419  41.8884    Â44  2.40044  2.40979
 41   Â63    494    431  42.0372    Â48  2.11044   2.406
 42   Â64    506    442  42.0837    Â44  2.11266  2.40229
 43   Â63    518    455  42.3139    Â52  2.33468  Â2.3982
 44   Â63    527    464  42.1703    Â36  Â2.4403  2.39559
 45   Â63    539    476  42.2995    Â48  2.19768  2.39413
 46   Â63    551    488  42.4232    Â48  2.51232  Â2.3928
 47   Â63    563    500  42.5416    Â48  2.18025  2.38958
 48   Â63    572    509  42.4051    Â36  2.27111  2.38791
 49   Â63    584    521  Â42.519    Â48  2.41684  2.38695
 50   Â63    596    533  42.6284    Â48  2.11087   2.384
 51   Â63    608    545  42.7335    Â48  2.18147  2.37925
 52   Â63    620    557  42.8345    Â48  2.45287  2.37787
 53   Â63    629    566  42.7054    Â36  2.45187  2.37801
 54   Â63    644    581  43.0255    Â60  2.22403  2.37477
 55   Â63    653    590  42.8976    Â36  2.22782  2.37157
 56   Â63    668    605  43.2026    Â60  2.20638  2.36597
 57   Â63    677    614  43.0761    Â36  2.19628  2.36209
 58   Â63    689    626  43.1608    Â48  2.18262  2.35762
 59   Â63    704    641  43.4459    Â60  2.27029  2.35352
min lat: 1.87981 max lat: 5.56194 avg lat: 2.34944
Âsec Cur ops  started Âfinished Âavg MB/s Âcur MB/s Âlast lat  avg lat
 60   Â63    716    653  43.5215    Â48  2.27835  2.34944
 61   Â64    717    653  Â42.808     0     -  2.34944
 62   Â63    717    654  42.1821     2  2.25694  2.34929
Total time run: Â Â Â Â62.274719
Total writes made: Â Â 717
Write size: Â Â Â Â Â Â4194304
Bandwidth (MB/sec): Â Â46.054
Average Latency: Â Â Â 5.453
Max latency: Â Â Â Â Â 62.0339
Min latency: Â Â Â Â Â 1.87981
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