メモリアロケーターをjemallocにする (MisskeyIO#152)

Dockerfile

@@ -62,7 +62,7 @@ ARG GID="991"
 
 RUN apt-get update \
 	&& apt-get install -y --no-install-recommends \
-	ffmpeg tini curl \
+	ffmpeg tini curl libjemalloc2 \
 	&& corepack enable \
 	&& groupadd -g "${GID}" misskey \
 	&& useradd -l -u "${UID}" -g "${GID}" -m -d /misskey misskey \
@@ -81,6 +81,8 @@ COPY --chown=misskey:misskey --from=native-builder /misskey/packages/backend/bui
 COPY --chown=misskey:misskey --from=native-builder /misskey/fluent-emojis /misskey/fluent-emojis
 COPY --chown=misskey:misskey . ./
 
+ENV LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2
+ENV MALLOC_CONF=background_thread:true,metadata_thp:auto,dirty_decay_ms:30000,muzzy_decay_ms:30000
 ENV NODE_ENV=production
 HEALTHCHECK --interval=5s --retries=20 CMD ["/bin/bash", "/misskey/healthcheck.sh"]
 ENTRYPOINT ["/usr/bin/tini", "--"]