Horton

Re: Speed up Clog Access by increasing CLOG buffers

Jesper Pedersen <jesper.pedersen@redhat.com>

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From: Jesper Pedersen <jesper.pedersen@redhat.com>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: David Steele <david@pgmasters.net>, Robert Haas <robertmhaas@gmail.com>, Thom Brown <thom@linux.com>, Simon Riggs <simon@2ndquadrant.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2016-03-16T18:27:34Z
Lists: pgsql-hackers

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On 03/15/2016 01:17 AM, Amit Kapila wrote:
> I have updated the comments and changed the name of one of a variable from
> "all_trans_same_page" to "all_xact_same_page" as pointed out offlist by
> Alvaro.
>
>

I have done a run, and don't see any regressions.

Intel Xeon 28C/56T @ 2GHz w/ 256GB + 2 x RAID10 (data + xlog) SSD.

I can provide perf / flamegraph profiles if needed.

Thanks for working on this !

Best regards,
  Jesper

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.