try optimising deployment

Dockerfile.production

@@ -84,6 +84,16 @@ USER rails:rails
 ENV RAILS_LOG_TO_STDOUT="1" \
     RAILS_SERVE_STATIC_FILES="true"
 
+# Enable jemalloc for better memory performance
+# https://fly.io/docs/rails/cookbooks/deploy/#jemalloc
+# And enable YJIT for better Ruby performance
+# https://fly.io/docs/rails/cookbooks/deploy/#yjit
+#
+RUN apt-get install libjemalloc2
+ENV LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2 \
+    MALLOC_CONF=dirty_decay_ms:1000,narenas:2,background_thread:true \
+    RUBY_YJIT_ENABLE=1
+
 # Entrypoint sets up the container.
 ENTRYPOINT ["/rails/bin/docker-entrypoint"]
 

bin/docker-entrypoint

@@ -2,4 +2,13 @@
 
 # Add any container initialization steps here
 
+# Enable swap https://fly.io/docs/rails/cookbooks/deploy/#enabling-swap
+#
+fallocate -l 128M /swapfile
+chmod 0600 /swapfile
+mkswap /swapfile
+echo 10 > /proc/sys/vm/swappiness
+swapon /swapfile
+echo 1 > /proc/sys/vm/overcommit_memory
+
 exec "${@}"