Use Jemalloc for opt-dist

Author: Kobzol

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -42,6 +42,8 @@ RUN yum upgrade -y && \
       zlib-devel.x86_64 \
       && yum clean all
 
+RUN yum install -y epel-release && yum install -y jemalloc
+
 RUN mkdir -p /rustroot/bin
 
 ENV PATH=/rustroot/bin:$PATH

src/ci/docker/host-x86_64/dist-x86_64-linux/dist.sh

@@ -4,6 +4,8 @@ set -eux
 
 python3 ../x.py build --set rust.debug=true opt-dist
 
+export LD_PRELOAD=/usr/lib64/libjemalloc.so.1
+
 ./build/$HOSTS/stage1-tools-bin/opt-dist linux-ci -- python3 ../x.py dist \
     --host $HOSTS --target $HOSTS \
     --include-default-paths \