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: Ashutosh Sharma <ashu.coek88@gmail.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, Michael Paquier <michael.paquier@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, Jim Nasby <Jim.Nasby@bluetreble.com>, Andres Freund <andres@anarazel.de>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-07-03T12:45:47Z
Lists: pgsql-hackers

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On Thu, Mar 23, 2017 at 1:18 PM, Ashutosh Sharma <ashu.coek88@gmail.com>
wrote:
>
> *Conclusion:*
> As seen from the test results mentioned above, there is some performance
> improvement with 3 SP(s), with 5 SP(s) the results with patch is slightly
> better than HEAD, with 7 and 10 SP(s) we do see regression with patch.
> Therefore, I think the threshold value of 4 for number of subtransactions
> considered in the patch looks fine to me.
>
>
Thanks for the tests.  Attached find the rebased patch on HEAD.  I have ran
latest pgindent on patch.  I have yet to add wait event for group lock
waits in this patch as is done by Robert in commit
 d4116a771925379c33cf4c6634ca620ed08b551d for ProcArrayGroupUpdate.

-- 
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.