From 671097cb26723bfc47dd366db96eadc1e3271809 Mon Sep 17 00:00:00 2001
From: Adrian Moldovan <3854374+adimoldovan@users.noreply.github.com>
Date: Thu, 30 Jul 2026 14:21:52 +0300
Subject: [PATCH 1/4] Build/Test Tools: Relax redo log durability for the test
 database.

The mysql service sets no command and ships no my.cnf, so it runs with
innodb_flush_log_at_trx_commit=1 and flushes the redo log to disk at every
commit. The PHPUnit suite commits twice per test class, so the multisite
suite pays about 1,622 redo-log fsyncs per run to protect a database that
every job destroys.

Value 2 removes those fsyncs and still writes the log at every commit, so
only a kernel crash or power cut can lose data, not a mysqld crash.

See #65762.
---
 docker-compose.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docker-compose.yml b/docker-compose.yml
index cc2ed8d94975e..547a3b9b136be 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -66,6 +66,8 @@ services:
   mysql:
     image: ${LOCAL_DB_TYPE-mysql}:${LOCAL_DB_VERSION-latest}
 
+    command: [ "--innodb-flush-log-at-trx-commit=2" ]
+
     networks:
       - wpdevnet
 

From def11b03fb95fedd2c133bfe635227f5f16320ad Mon Sep 17 00:00:00 2001
From: Adrian Moldovan <3854374+adimoldovan@users.noreply.github.com>
Date: Thu, 30 Jul 2026 15:41:46 +0300
Subject: [PATCH 2/4] Build/Test Tools: Note why the test database relaxes redo
 log durability.

---
 docker-compose.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docker-compose.yml b/docker-compose.yml
index 547a3b9b136be..d93854ef842e5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -66,6 +66,7 @@ services:
   mysql:
     image: ${LOCAL_DB_TYPE-mysql}:${LOCAL_DB_VERSION-latest}
 
+    # This database is disposable, so it does not need a durable write at every commit.
     command: [ "--innodb-flush-log-at-trx-commit=2" ]
 
     networks:

From a83302a7ae21cc1ef4baf27e906313257cf0bf57 Mon Sep 17 00:00:00 2001
From: Adrian Moldovan <3854374+adimoldovan@users.noreply.github.com>
Date: Thu, 30 Jul 2026 16:02:46 +0300
Subject: [PATCH 3/4] Build/Test Tools: Run the PHPUnit tests when the Docker
 environment changes.

docker-compose.yml defines the environment the suite runs in, but the PHPUnit
workflow does not list it in its path filter. A change to that environment
therefore never runs the tests it affects.

See #65762.
---
 .github/workflows/phpunit-tests.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/phpunit-tests.yml b/.github/workflows/phpunit-tests.yml
index a9be5d8565fe3..b91f0c5da0df6 100644
--- a/.github/workflows/phpunit-tests.yml
+++ b/.github/workflows/phpunit-tests.yml
@@ -31,6 +31,7 @@ on:
       - 'tests/phpunit/**'
       - 'tests/phpunit/multisite.xml'
       - 'phpunit.xml.dist'
+      - 'docker-compose.yml'
       # Confirm any changes to relevant workflow files.
       - '.github/workflows/phpunit-tests.yml'
       - '.github/workflows/reusable-phpunit-tests-*.yml'

From 5d81e2cee243793c4635329c1a671f73538353d2 Mon Sep 17 00:00:00 2001
From: Adrian Moldovan <3854374+adimoldovan@users.noreply.github.com>
Date: Thu, 30 Jul 2026 16:28:59 +0300
Subject: [PATCH 4/4] MEASUREMENT: try innodb_flush_log_at_trx_commit=0 (to be
 reverted)

---
 docker-compose.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docker-compose.yml b/docker-compose.yml
index d93854ef842e5..c672fe29573db 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -67,7 +67,7 @@ services:
     image: ${LOCAL_DB_TYPE-mysql}:${LOCAL_DB_VERSION-latest}
 
     # This database is disposable, so it does not need a durable write at every commit.
-    command: [ "--innodb-flush-log-at-trx-commit=2" ]
+    command: [ "--innodb-flush-log-at-trx-commit=0" ]
 
     networks:
       - wpdevnet