Merge pull request #1604 from essen/better-default-allocs

Use more optimal default memory allocators where available (Erlang 20.2.3 or later)

1 files changed, 20 insertions, 0 deletions

diff --git a/scripts/rabbitmq-server b/scripts/rabbitmq-server
index 27948ea6b7..f8b868c039 100755
--- a/scripts/rabbitmq-server
+++ b/scripts/rabbitmq-server
@@ -120,6 +120,25 @@ if [ ! -f "${RABBITMQ_SCHEMA_DIR}/rabbit.schema" ]; then
     cp "${RABBITMQ_HOME}/priv/schema/rabbit.schema" "${RABBITMQ_SCHEMA_DIR}"
 fi
 
+# The default allocation strategy RabbitMQ is using was introduced
+# in Erlang/OTP 20.2.3. Earlier Erlang versions fail to start with
+# this configuration. We therefore need to ensure that erl accepts
+# these values before we can use them.
+#
+# The defaults are meant to reduce RabbitMQ's memory usage and help
+# it reclaim memory at the cost of a slight decrease in performance
+# (due to an increase in memory operations). These defaults can be
+# overriden using the RABBITMQ_SERVER_ERL_ARGS variable.
+RABBITMQ_DEFAULT_ALLOC_ARGS="+MBas ageffcbf +MHas ageffcbf +MBlmbcs 512 +MHlmbcs 512 +MMmcs 30"
+
+${ERL_DIR}erl ${RABBITMQ_DEFAULT_ALLOC_ARGS} \
+    -boot "${CLEAN_BOOT_FILE}" \
+    -noinput -eval 'halt(0)' 2>/dev/null
+
+if [ $? != 0 ] ; then
+    RABBITMQ_DEFAULT_ALLOC_ARGS=
+fi
+
 set -e
 
 RABBITMQ_CONFIG_FILE_NOEX="${RABBITMQ_CONFIG_FILE%.*}"
@@ -213,6 +232,7 @@ start_rabbitmq_server() {
         ${RABBITMQ_CONFIG_ARG} \
         +W w \
         +A ${RABBITMQ_IO_THREAD_POOL_SIZE} \
+        ${RABBITMQ_DEFAULT_ALLOC_ARGS} \
         ${RABBITMQ_SERVER_ERL_ARGS} \
         +K true \
         -kernel inet_default_connect_options "[{nodelay,true}]" \