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Diffstat (limited to 'Documentation/public-inbox-tuning.pod')
| -rw-r--r-- | Documentation/public-inbox-tuning.pod | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/public-inbox-tuning.pod b/Documentation/public-inbox-tuning.pod index 73246144..b56c2b10 100644 --- a/Documentation/public-inbox-tuning.pod +++ b/Documentation/public-inbox-tuning.pod @@ -165,8 +165,11 @@ 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. -jemalloc (tested as an LD_PRELOAD on GNU/Linux) appears to reduce -overall fragmentation compared to glibc malloc in long-lived processes. +glibc malloc users should use C<MALLOC_MMAP_THRESHOLD_=131072> to reduce +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 |