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The cause of the slowdown was a change to the ZFS dataset. In conjunction with the database server, very little caching was being done. This combination resulted in increased disk I/O as the system churned through the database. Details in the blog post which outlines the various things which changed. Many graphs.

Port details
pg_stat_kcache Gather statistics about PostgreSQL I/O and CPU usage
2.1.1_2 databases on this many watch lists=1 search for ports that depend on this port Find issues related to this port Report an issue related to this port 2.1.1Version of this port present on the latest quarterly branch.
Maintainer: girgen@FreeBSD.org search for ports maintained by this maintainer
Port Added: 2016-05-28 18:26:43
Last Update: 2019-08-13 17:01:59
SVN Revision: 508835
License: PostgreSQL
Description:
SVNWeb : Homepage
pkg-plist: as obtained via: make generate-plist
Expand this list (9 items)
  1. /usr/local/share/licenses/pg_stat_kcache-2.1.1_2/catalog.mk
  2. /usr/local/share/licenses/pg_stat_kcache-2.1.1_2/LICENSE
  3. /usr/local/share/licenses/pg_stat_kcache-2.1.1_2/PostgreSQL
  4. lib/postgresql/pg_stat_kcache.so
  5. share/doc/postgresql/extension/pg_stat_kcache-README.rst
  6. share/postgresql/extension/pg_stat_kcache--2.1.0--2.1.1.sql
  7. share/postgresql/extension/pg_stat_kcache--2.1.0.sql
  8. share/postgresql/extension/pg_stat_kcache--2.1.1.sql
  9. share/postgresql/extension/pg_stat_kcache.control
Collapse this list.
Dependency lines:
  • pg_stat_kcache>0:databases/pg_stat_kcache
To install the port: cd /usr/ports/databases/pg_stat_kcache/ && make install clean
To add the package: pkg install pg_stat_kcache
PKGNAME: pg_stat_kcache
Flavors: there is no flavor information for this port.
distinfo:

Dependencies
NOTE: FreshPorts displays only information on required and default dependencies. Optional dependencies are not covered.
Build dependencies:
  1. gmake : devel/gmake
  2. vacuumlo : databases/postgresql95-contrib
  3. postgres : databases/postgresql95-server
Runtime dependencies:
  1. vacuumlo : databases/postgresql95-contrib
  2. postgres : databases/postgresql95-server
This port is required by:
for Run
  1. databases/powa-archivist

Configuration Options

USES:

pkg-message:
If installing:
Master Sites:
  1. https://codeload.github.com/powa-team/pg_stat_kcache/tar.gz/REL2_1_1?dummy=/

Number of commits found: 9

Commit History - (may be incomplete: see SVNWeb link above for full details)
DateByDescription
13 Aug 2019 16:01:59
Original commit files touched by this commit  2.1.1_2
Revision:508835  Sanity Test Failure
mat search for other commits by this committer
Convert to UCL & cleanup pkg-message (categories d)
26 Jul 2019 20:46:57
Original commit files touched by this commit  2.1.1_2
Revision:507372
gerald search for other commits by this committer
Bump PORTREVISION for ports depending on the canonical version of GCC
as defined in Mk/bsd.default-versions.mk which has moved from GCC 8.3
to GCC 9.1 under most circumstances now after revision 507371.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, everything INDEX-11 shows with a dependency on lang/gcc9 now.

PR:		238330
12 Dec 2018 01:35:36
Original commit files touched by this commit  2.1.1_1
Revision:487272
gerald search for other commits by this committer
Bump PORTREVISION for ports depending on the canonical version of GCC
defined via Mk/bsd.default-versions.mk which has moved from GCC 7.4 t
GCC 8.2 under most circumstances.

This includes ports
 - with USE_GCC=yes or USE_GCC=any,
 - with USES=fortran,
 - using Mk/bsd.octave.mk which in turn features USES=fortran, and
 - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang,
   c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib
plus, as a double check, everything INDEX-11 showed depending on lang/gcc7.

PR:		231590
21 Nov 2018 08:37:32
Original commit files touched by this commit  2.1.1
Revision:485502
mat search for other commits by this committer
Fix USE_GITHUB usage.
06 Nov 2018 23:46:06
Original commit files touched by this commit  2.1.1
Revision:484367
girgen search for other commits by this committer
Upgrade powa-archivist and siblings

pg_qualstat-1.0.6
pg_stat_kcache-2.1.1
powa-archvist-3.2.0

Release
notes:	https://github.com/powa-team/powa-archivist/blob/REL_3_2_0/CHANGELOG.md
		https://github.com/powa-team/pg_qualstats/blob/1.0.6/CHANGELOG
		https://github.com/powa-team/pg_stat_kcache/blob/REL2_1_1/CHANGELOG.md
24 Jun 2018 00:54:27
Original commit files touched by this commit  2.0.3
Revision:473169
linimon search for other commits by this committer
Workaround the following problem on aarch64 by setting LLD_UNSAFE=yes:

  cc: error: invalid linker name in argument '-fuse-ld=bfd'

Neither emaste nor I can figure out exactly where the offending stanza is
coming in.  It will take someone with more knowledge of gmake debug flags,
and possibly the src build infrastructure, to figure it out.

While here, pet portlint.

Approved by:	portmgr (tier-2 blanket)
04 Oct 2016 09:55:54
Original commit files touched by this commit  2.0.3
Revision:423248
girgen search for other commits by this committer
Update to 2.0.3

Add PG 9.6 compatibility

Fix issues in shared memory estimation, which could prevent starting postgres
or reduce the amount of possible locks (thanks to Jean-Sebastien BACQ for the
report)

Add hint of possible reasons pgss.max could not be retrieved, which could
prevent starting postgres

Make portlint happy
01 Jun 2016 13:15:37
Original commit files touched by this commit  2.0.2
Revision:416242
mat search for other commits by this committer
Github cleanup.

- Use the version tag instead of commit hash when they're the same.
- Remove unnneeded variables.
- Simplify go- ports when possible.
- Various fixes.

Sponsored by:	Absolight
28 May 2016 18:26:33
Original commit files touched by this commit  2.0.2
Revision:416058
girgen search for other commits by this committer
Add pg_stat_kcache module

Gathers statistics about real reads and writes done by the filesystem layer. It
is provided in the form of an extension for PostgreSQL >= 9.4., and requires
pg_stat_statements extension to be installed. PostgreSQL 9.4 or more is
required as previous version of provided pg_stat_statements didn't expose the
queryid field.

WWW:	https://github.com/dalibo/pg_stat_kcache

Number of commits found: 9

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