From 7567359755a105e7278bbf97541332f28228b87d Mon Sep 17 00:00:00 2001 From: Dan Smith Date: Mon, 13 Feb 2023 14:41:40 +0000 Subject: [PATCH] Try to reduce mysql memory usage These are a few tweaks I applied to my own memory-constrained cloud instances that seemed to help. I have lower performance requirements so this may make things worse and not better, but it's worth seeing what the impact is. I'll admit to not knowing the full impact of these as they're mostly collected from various tutorials on lowering memory usage. Enable this for now on devstack-multinode Change-Id: I7b223391d3de01e3e81b02076debd01d9d2f097c --- .zuul.yaml | 3 +++ lib/databases/mysql | 10 ++++++++++ stackrc | 5 +++++ 3 files changed, 18 insertions(+) diff --git a/.zuul.yaml b/.zuul.yaml index 8e20f6ed34..fa7f180797 100644 --- a/.zuul.yaml +++ b/.zuul.yaml @@ -696,6 +696,9 @@ description: | Simple multinode test to verify multinode functionality on devstack side. This is not meant to be used as a parent job. + vars: + devstack_localrc: + MYSQL_REDUCE_MEMORY: true # NOTE(ianw) Platform tests have traditionally been non-voting because # we often have to rush things through devstack to stabilise the gate, diff --git a/lib/databases/mysql b/lib/databases/mysql index fbad44e36a..e805b3e73f 100644 --- a/lib/databases/mysql +++ b/lib/databases/mysql @@ -176,6 +176,16 @@ function configure_database_mysql { count INT, PRIMARY KEY (db, op)) ENGINE MEMORY" stats fi + if [[ "$MYSQL_REDUCE_MEMORY" == "True" ]]; then + iniset -sudo $my_conf mysqld read_buffer_size 64K + iniset -sudo $my_conf mysqld innodb_buffer_pool_size 16M + iniset -sudo $my_conf mysqld thread_stack 192K + iniset -sudo $my_conf mysqld thread_cache_size 8 + iniset -sudo $my_conf mysqld tmp_table_size 8M + iniset -sudo $my_conf mysqld sort_buffer_size 8M + iniset -sudo $my_conf mysqld max_allowed_packet 8M + fi + restart_service $MYSQL_SERVICE_NAME } diff --git a/stackrc b/stackrc index a05d1e5553..442e9a0351 100644 --- a/stackrc +++ b/stackrc @@ -201,6 +201,11 @@ DATABASE_QUERY_LOGGING=$(trueorfalse False DATABASE_QUERY_LOGGING) # performance_schema that are of interest to us MYSQL_GATHER_PERFORMANCE=$(trueorfalse True MYSQL_GATHER_PERFORMANCE) +# This can be used to reduce the amount of memory mysqld uses while running. +# These are unscientifically determined, and could reduce performance or +# cause other issues. +MYSQL_REDUCE_MEMORY=$(trueorfalse False MYSQL_REDUCE_MEMORY) + # Set a timeout for git operations. If git is still running when the # timeout expires, the command will be retried up to 3 times. This is # in the format for timeout(1);