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| author | Eric Wong <e@80x24.org> | 2024-03-11 19:40:11 +0000 |
|---|---|---|
| committer | Eric Wong <e@80x24.org> | 2024-03-12 06:18:18 +0000 |
| commit | 298b05cef615ae3d3f1323e805fe135ae5138144 (patch) | |
| tree | 5eac79948ec406cbc2c6d153d2a31df1c4a2c5f7 /examples | |
| parent | 166532d5a7fb7409db8e7877ca961afb60ad28e5 (diff) | |
| download | public-inbox-298b05cef615ae3d3f1323e805fe135ae5138144.tar.gz | |
I may be mistaken, but I suspect the reason jemalloc handles long-lived processes better than glibc is due to granularity reduction being scaled to larger size classes. This can waste 20% of an individual allocation, but increases the likelyhood of reuse (without splitting/consolidating into other sizes). In other words, glibc seems to try too hard to make the best fit for initial allocations. This ends up being suboptimal over time as those allocations are freed and similar (but not identical) allocations come in. jemalloc sacrifices the best initial fit for better fits over a long process lifetime.
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/public-inbox-netd@.service | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/examples/public-inbox-netd@.service b/examples/public-inbox-netd@.service index de5feea6..2330bd59 100644 --- a/examples/public-inbox-netd@.service +++ b/examples/public-inbox-netd@.service @@ -12,6 +12,8 @@ Wants = public-inbox-netd.socket After = public-inbox-netd.socket [Service] +# An LD_PRELOAD for libjemalloc can be added here. It currently seems +# more resistant to fragmentation to glibc in long-lived daemons. Environment = PI_CONFIG=/home/pi/.public-inbox/config \ PATH=/usr/local/bin:/usr/bin:/bin \ TZ=UTC \ |