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Add jemalloc and AMD Zen3 CPU optimizations to bookworm build #3

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19 changes: 17 additions & 2 deletions docker/bookworm/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -32,8 +32,8 @@ WORKDIR /build
# Clone Node.js repository (shallow clone for faster build)
RUN git clone --depth 1 --branch ${NODE_VERSION} https://github.com/nodejs/node.git .

# Configure with pointer compression enabled
RUN ./configure --experimental-enable-pointer-compression
RUN CFLAGS="-march=znver3 -mtune=znver3 -O3" CXXFLAGS="-march=znver3 -mtune=znver3 -O3" \
./configure --experimental-enable-pointer-compression

# Build Node.js using all available cores
# ccache is available for faster rebuilds if cache is mounted
Expand All @@ -42,6 +42,21 @@ RUN make -j$(nproc)
# Install Node.js system-wide
RUN make install

# jemalloc - reduce memory fragmentation in long-running Node.js processes
# Note: V8's JS heap uses mmap directly; jemalloc primarily manages Buffer/ArrayBuffer
# backing stores (file I/O chunks), libuv internals, and native addon allocations.
# background_thread: dedicated thread for async decay (avoids inline purge latency)
# dirty_decay_ms:1000 - return dirty pages after 1s (RSS-friendly for containers)
# muzzy_decay_ms:10000 - MADV_FREE muzzy pages after 10s; kernel reclaims under pressure,
# but longer window avoids re-faulting Buffer pages on high-throughput I/O paths
# narenas:2 - minimize per-arena RSS overhead; acceptable contention at low thread counts
# retain:false - munmap freed extents; keeps VSIZE bounded
RUN apt-get update && apt-get install -y --no-install-recommends libjemalloc2 \
&& rm -rf /var/lib/apt/lists/*
ENV LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2
ENV MALLOC_CONF=background_thread:true,dirty_decay_ms:1000,muzzy_decay_ms:10000,narenas:2,retain:false


# Cleanup build directory to reduce image size
WORKDIR /
RUN rm -rf /build
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