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RE: [EXTERNAL] Re: WIP: WAL prefetch (another approach)

Sait Talha Nisanci <sait.nisanci@microsoft.com>

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From: Sait Talha Nisanci <Sait.Nisanci@microsoft.com>
To: Stephen Frost <sfrost@snowman.net>
Cc: Thomas Munro <thomas.munro@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, Dmitry Dolgov <9erthalion6@gmail.com>, David Steele <david@pgmasters.net>, Andres Freund <andres@anarazel.de>, Alvaro Herrera <alvherre@2ndquadrant.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2020-08-27T17:36:01Z
Lists: pgsql-hackers 
Hi Stephen,

OS version is Ubuntu 18.04.5 LTS.
Filesystem is ext4 and block size is 4KB.

Talha.

-----Original Message-----
From: Stephen Frost <sfrost@snowman.net> 
Sent: Thursday, August 27, 2020 4:56 PM
To: Sait Talha Nisanci <Sait.Nisanci@microsoft.com>
Cc: Thomas Munro <thomas.munro@gmail.com>; Tomas Vondra <tomas.vondra@2ndquadrant.com>; Dmitry Dolgov <9erthalion6@gmail.com>; David Steele <david@pgmasters.net>; Andres Freund <andres@anarazel.de>; Alvaro Herrera <alvherre@2ndquadrant.com>; pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: [EXTERNAL] Re: WIP: WAL prefetch (another approach)

Greetings,

* Sait Talha Nisanci (Sait.Nisanci@microsoft.com) wrote:
> I have run some benchmarks for this patch. Overall it seems that there is a good improvement with the patch on recovery times:

Maybe I missed it somewhere, but what's the OS/filesystem being used here..?  What's the filesystem block size..?

Thanks,

Stephen

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Fix recovery_prefetch docs.

  2. Prefetch data referenced by the WAL, take II.

  3. Add circular WAL decoding buffer, take II.

  4. Fix generation of ./INSTALL for the distribution tarball

  5. Revert recovery prefetching feature.

  6. Sync guc.c and postgresql.conf.sample with the SGML docs.

  7. Add information of total data processed to replication slot stats.

  8. Doc: Review for "Optionally prefetch referenced data in recovery."

  9. Add circular WAL decoding buffer.

  10. Optionally prefetch referenced data in recovery.

  11. Remove read_page callback from XLogReader.

  12. Provide ReadRecentBuffer() to re-pin buffers by ID.

  13. Provide recovery_init_sync_method=syncfs.

  14. Mark factorial operator, and postfix operators in general, as deprecated.

  15. Rationalize GetWalRcv{Write,Flush}RecPtr().

  16. Support PrefetchBuffer() in recovery.

  17. Prevent hard failures of standbys caused by recycled WAL segments