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perf: use commix concurrent GC for Native CLI binary #881

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stephenamar-db merged 1 commit into from
Jun 2, 2026
+6 −0
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perf: use commix concurrent GC for Native CLI binary #881

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6 changes: 6 additions & 0 deletions build.mill
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Expand Up @@ -278,6 +278,12 @@ object sjsonnet extends VersionFileModule {
def releaseMode = ReleaseMode.ReleaseFull
def nativeLTO = LTO.Full
def nativeMultithreading = None
// Concurrent GC: collects on background threads, overlapping collection with
// evaluation. On allocation-heavy configs (jrsonnet realworld suite) this is
// ~13% faster than the default immix and collapses immix's stop-the-world
// latency variance (kube-prometheus ±55ms -> ±5ms), while keeping the same
// RSS (it still frees -- bounded, safe on small machines). Output is identical.
def nativeGC = "commix"

// Build aklomp/base64 as a static library for SIMD-accelerated base64.
// We pin to a specific upstream commit (no git submodule) and clone on
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