Horton

Re: Speed up Clog Access by increasing CLOG buffers

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2016-04-07T15:40:51Z
Lists: pgsql-hackers 
On Thu, Apr 7, 2016 at 6:48 PM, Andres Freund <andres@anarazel.de> wrote:
>
> On 2016-04-07 18:40:14 +0530, Amit Kapila wrote:
> > This is the data with -b tpcb-like@1 with 20-min run for each version
and I
> > could see almost similar results as the data posted in previous e-mail.
> >
> > Client Count/Patch_ver (tps) 256
> > clog_buf_128 40617
> > clog_buf_128 +group_clog_v8 51137
> > clog_buf_128 +content_lock 54188
> >
> > For -b select-only@3,  I have done quicktest for each version and
number is
> > same 62K~63K for all version, why do you think this will improve
> > select-only workload?
>
> What I was looking for was pgbench with both -btpcb-like@1
> -bselect-only@3 specified; i.e. a mixed read/write test.
>

Okay, I can again take the performance data, but on what basis are we
ignoring the variation of results on power m/c, previous to this I have not
seen such a variation for read-write tests.


With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com

Commits

  1. Use group updates when setting transaction status in clog.

  2. Improve 64bit atomics support.

  3. Add ProcArrayGroupUpdate wait event.

  4. Make the different Unix-y semaphore implementations ABI-compatible.

  5. Fix broken ALTER INDEX documentation

  6. Code and docs review for commit 3187d6de0e5a9e805b27c48437897e8c39071d45.

  7. Partition the freelist for shared dynahash tables.

  8. Correct StartupSUBTRANS for page wraparound

  9. Make idle backends exit if the postmaster dies.

  10. contrib/sslinfo: add ssl_extension_info SRF

  11. Reduce ProcArrayLock contention by removing backends in batches.

  12. Fix `make installcheck` for serializable transactions.

  13. Lockless StrategyGetBuffer clock sweep hot path.

  14. Reduce sinval synchronization overhead.