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: Jesper Pedersen <jesper.pedersen@redhat.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: 2016-03-17T03:39:36Z
Lists: pgsql-hackers 
On Wed, Mar 16, 2016 at 11:57 PM, Jesper Pedersen <
jesper.pedersen@redhat.com> wrote:
>
> 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.
>

Can you provide the details of test, like is this pgbench read-write test
and if possible steps for doing test execution.

I wonder if you can do the test with unlogged tables (if you are using
pgbench, then I think you need to change the Create Table command to use
Unlogged option).

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

Can you provide CPU information (probably by using lscpu).


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.