Re: 3.10.5 vs 3.12.0 huge performance loss

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On 09/06/2017 05:48 AM, Serkan Çoban wrote:
Hi,

Just do some ingestion tests to 40 node 16+4EC 19PB single volume.
100 clients are writing each has 5 threads total 500 threads.
With 3.10.5 each server has 800MB/s network traffic, cluster total is 32GB/s
With 3.12.0 each server has 200MB/s network traffic, cluster total is 8GB/s
I did not change any volume options in both configs.

I just performed some *basic* IOZone tests on a 6 x (4+2) disperse volume and compared this against 3.10.5 and 3.12.0. The tests are no where near your capacity, but I do not see anything alarming in the results. (4 server, 4 clients, 4 worker thread per client)

I do notice a 6% drop in Sequential and random write performance, and gains in the sequential and random reads.

I need to improve the test to do larger files and for a longer duration, hence not reporting any numbers as yet.

Tests were against 3.10.5 and then a down server upgrade to 3.12.0 and remounting on the clients (after the versions were upgraded there as well).

I guess your test can be characterized as a sequential write workload (ingestion of data). What is the average file size being ingested? I can mimic something equivalent to that to look at this further.

I would like to ensure there are no evident performance regressions as you report.

Shyam
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