Re: rados_read versus rados_aio_read performance

[Gregory Farnum <gfarnum@xxxxxxxxxx>]

It sounds like you are doing synchronous reads of small objects here. In that case you are dominated by the per-op already rather than the throughout of your cluster. Using aio or multiple threads will let you parallelism requests.
-Greg

On Fri, Sep 29, 2017 at 3:33 AM Alexander Kushnirenko <kushnirenko@xxxxxxxxx> wrote:

Hello,

We see very poor performance when reading/writing rados objects.  The speed is only 3-4MB/sec, compared to 95MB rados benchmarking.

When you look on underline code it uses librados and linradosstripper libraries (both have poor performance) and the code uses rados_read and rados_write functions.  If you look on examples they recommend rados_aio_read/write.  

Could this be the reason for poor performance?

Thank you,

Alexander.

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