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| author | Eric Wong <e@80x24.org> | 2024-05-14 06:38:06 +0000 |
|---|---|---|
| committer | Eric Wong <e@80x24.org> | 2024-05-14 22:08:14 +0000 |
| commit | c372f2c24d64435c303024f103aac99e37ffb0b4 (patch) | |
| tree | e25a75cf641a83660bb2eec27f4b91df00e33054 /Documentation/public-inbox-tuning.pod | |
| parent | 43f890ecda3e1e7d8c55c8a9173d1c430339bcd8 (diff) | |
| download | public-inbox-master.tar.gz | |
My 32-bit server seems less happy with jemalloc; likely since munmap is creating holes and it's not using sbrk by default. jemalloc seems to need large VM space (not actual memory) to work well, and that isn't a possibility for constrained 32-bit systems.
Diffstat (limited to 'Documentation/public-inbox-tuning.pod')
| -rw-r--r-- | Documentation/public-inbox-tuning.pod | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/public-inbox-tuning.pod b/Documentation/public-inbox-tuning.pod index 892ee0f2..b56c2b10 100644 --- a/Documentation/public-inbox-tuning.pod +++ b/Documentation/public-inbox-tuning.pod @@ -166,9 +166,10 @@ capacity planning. Bursts of small object allocations late in process life contribute to fragmentation of the heap due to arenas (slabs) used internally by Perl. glibc malloc users should use C<MALLOC_MMAP_THRESHOLD_=131072> to reduce -fragmentation from the sliding mmap window. jemalloc (tested as an -LD_PRELOAD on GNU/Linux) also reduces fragmentation compared to an -unconfigured glibc malloc in long-lived processes. +fragmentation from the sliding mmap window. On 64-bit systems, jemalloc +(tested as an LD_PRELOAD on GNU/Linux) reduces fragmentation at the +expense of VM space. 32-bit systems may be better off sticking with +glibc and MALLOC_MMAP_THRESHOLD_. =head2 Other OS tuning knobs |