Horton

Re: Speed up Clog Access by increasing CLOG buffers

Amit Kapila <amit.kapila16@gmail.com>

View thread View on postgr.es
From: Amit Kapila <amit.kapila16@gmail.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Thom Brown <thom@linux.com>, Simon Riggs <simon@2ndquadrant.com>, Jesper Pedersen <jesper.pedersen@redhat.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2016-02-27T04:37:52Z
Lists: pgsql-hackers 
On Sat, Feb 27, 2016 at 10:03 AM, Amit Kapila <amit.kapila16@gmail.com>
wrote:
>
>
> Here, we can see that there is a gain of ~15% to ~38% at higher client
> count.
>
> The attached document (perf_write_clogcontrollock_data_v6.ods) contains
> data, mainly focussing on single client performance.  The data is for
> multiple runs on different machines, so I thought it is better to present
> in form of document rather than dumping everything in e-mail.  Do let me
> know if there is any confusion in understanding/interpreting the data.
>
>
Forgot to mention that all these tests have been done by
reverting commit-ac1d794.


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.