postgresql/src/backend/utils
Heikki Linnakangas fc0f3b4cb0 Fix parallel sort, broken by the balanced merge patch.
The code for initializing the tapes on each merge iteration was skipped
in a parallel worker. I put the !WORKER(state) check in wrong place while
rebasing the patch.

That caused failures in the index build in 'multiple-row-versions'
isolation test, in multiple buildfarm members. On my laptop it was easier
to reproduce by building an index on a larger table, so that you got a
parallel sort more reliably.
2021-10-18 20:42:10 +03:00
..
activity Fix performance regression from session statistics. 2021-09-16 02:05:50 -07:00
adt Fix EXPLAIN of SEARCH BREADTH FIRST queries some more. 2021-10-11 11:56:52 -04:00
cache Disable anonymous record hash support except in special cases 2021-09-08 09:55:04 +02:00
error Refactor fallback to stderr for csvlog to handle better WIN32 service case 2021-10-08 11:08:35 +09:00
fmgr Clean up some code using "(expr) ? true : false" 2021-09-08 09:44:04 +09:00
hash Update copyright for 2021 2021-01-02 13:06:25 -05:00
init Fix typo. 2021-08-13 05:44:03 -07:00
mb Make Unicode makefile parallel-safe 2021-10-04 20:26:48 +02:00
misc Introduce GUC shared_memory_size_in_huge_pages 2021-09-21 10:31:58 +09:00
mmgr Fix Portal snapshot tracking to handle subtransactions properly. 2021-10-01 11:10:12 -04:00
resowner Update README for resource owners about the resource types supported 2021-09-15 10:47:44 +09:00
sort Fix parallel sort, broken by the balanced merge patch. 2021-10-18 20:42:10 +03:00
time Replace occurrences of InvalidXid with InvalidTransactionId 2021-10-04 10:31:01 +02:00
.gitignore Rearrange makefile rules for running Gen_fmgrtab.pl. 2018-05-03 17:54:18 -04:00
errcodes.txt Rethink SQLSTATE code for ERRCODE_IDLE_SESSION_TIMEOUT. 2021-01-11 14:53:42 -05:00
Gen_dummy_probes.pl Emit dummy statements for probes.d probes when disabled 2021-05-10 11:40:03 +02:00
Gen_dummy_probes.pl.prolog Tweak generation of Gen_dummy_probes.pl 2021-05-11 20:02:02 -04:00
Gen_dummy_probes.sed Emit dummy statements for probes.d probes when disabled 2021-05-10 11:40:03 +02:00
Gen_fmgrtab.pl Update copyright for 2021 2021-01-02 13:06:25 -05:00
generate-errcodes.pl Update copyright for 2021 2021-01-02 13:06:25 -05:00
Makefile Tweak generation of Gen_dummy_probes.pl 2021-05-11 20:02:02 -04:00
probes.d Update copyright for 2021 2021-01-02 13:06:25 -05:00
README.Gen_dummy_probes Tweak generation of Gen_dummy_probes.pl 2021-05-11 20:02:02 -04:00

# Generating dummy probes

If Postgres isn't configured with dtrace enabled, we need to generate
dummy probes for the entries in probes.d, that do nothing.

This is accomplished in Unix via the sed script `Gen_dummy_probes.sed`. We
used to use this in MSVC builds using the perl utility `psed`, which mimicked
sed. However, that utility disappeared from Windows perl distributions and so
we converted the sed script to a perl script to be used in MSVC builds.

We still keep the sed script as the authoritative source for generating
these dummy probes because except on Windows perl is not a hard requirement
when building from a tarball.

So, if you need to change the way dummy probes are generated, first change
the sed script, and when it's working generate the perl script. This can
be accomplished by using the perl utility s2p.

s2p is no longer part of the perl core, so it might not be on your system,
but it is available on CPAN and also in many package systems. e.g.
on Fedora it can be installed using `cpan App::s2p` or
`dnf install perl-App-s2p`.

The Makefile contains a recipe for regenerating Gen_dummy_probes.pl, so all
you need to do is once you have s2p installed is `make Gen_dummy_probes.pl`
Note that in a VPATH build this will generate the file in the vpath tree,
not the source tree.