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: pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2015-09-21T12:55:45Z
Lists: pgsql-hackers 
On 09/18/2015 11:11 PM, Amit Kapila wrote:
>> I have done various runs on an Intel Xeon 28C/56T w/ 256Gb mem and 2 x
>> RAID10 SSD (data + xlog) with Min(64,).
>>
>>
> The benefit with this patch could be seen at somewhat higher
> client-count as you can see in my initial mail, can you please
> once try with client count > 64?
>

Client count were from 1 to 80.

I did do one run with Min(128,) like you, but didn't see any difference 
in the result compared to Min(64,), so focused instead in the 
sync_commit on/off testing case.

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.