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Re: Perf Benchmarking and regression. - Mailing list pgsql-hackers

From Ashutosh Sharma
Subject Re: Perf Benchmarking and regression.
Date
Msg-id CAE9k0PmQi_XJFVp9U4hdGmb6b+Q7VnD-xp0B7uxNfPgDYq8QgA@mail.gmail.com
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In response to Re: Perf Benchmarking and regression.  (Robert Haas <robertmhaas@gmail.com>)
Responses Re: Perf Benchmarking and regression.
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Hi,

Please find the results for the following 3 scenarios with unpatched master:

1. Default settings for *_flush_after : TPS = 10677.662356
2. backend_flush_after=0, rest defaults : TPS = 18452.655936
3. backend_flush_after=0, bgwriter_flush_after=0,
wal_writer_flush_after=0, checkpoint_flush_after=0 : TPS = 18614.479962

With Regards,
Ashutosh Sharma
EnterpriseDB: http://www.enterprisedb.com

On Fri, May 13, 2016 at 7:50 PM, Robert Haas <robertmhaas@gmail.com> wrote:
On Fri, May 13, 2016 at 7:08 AM, Ashutosh Sharma <ashu.coek88@gmail.com> wrote:
> Following are the performance results for read write test observed with
> different numbers of "backend_flush_after".
>
> 1) backend_flush_after = 256kb (32*8kb), tps = 10841.178815
> 2) backend_flush_after = 512kb (64*8kb), tps = 11098.702707
> 3) backend_flush_after = 1MB (128*8kb), tps = 11434.964545
> 4) backend_flush_after = 2MB (256*8kb), tps = 13477.089417

So even at 2MB we don't come close to recovering all of the lost
performance.  Can you please test these three scenarios?

1. Default settings for *_flush_after
2. backend_flush_after=0, rest defaults
3. backend_flush_after=0, bgwriter_flush_after=0,
wal_writer_flush_after=0, checkpoint_flush_after=0

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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