diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/RelNotes/v2.0.0.wip | 5 | ||||
| -rw-r--r-- | Documentation/public-inbox-tuning.pod | 9 |
2 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/RelNotes/v2.0.0.wip b/Documentation/RelNotes/v2.0.0.wip index 4d872fd7..794d7956 100644 --- a/Documentation/RelNotes/v2.0.0.wip +++ b/Documentation/RelNotes/v2.0.0.wip @@ -54,8 +54,9 @@ treewide * SHA-256 coderepos are fully supported (but not inboxes, yet) - * jemalloc (tested as an LD_PRELOAD) is recommended to reduce fragmentation - in long-running daemon processes serving unpredictable traffic + * for daemons serving public traffic, MALLOC_MMAP_THRESHOLD_=131072 is + recommended to reduce fragmentation in glibc malloc, while jemalloc + (tested as an LD_PRELOAD) is another option. PublicInbox::WWW diff --git a/Documentation/public-inbox-tuning.pod b/Documentation/public-inbox-tuning.pod index 7d0690b4..892ee0f2 100644 --- a/Documentation/public-inbox-tuning.pod +++ b/Documentation/public-inbox-tuning.pod @@ -165,11 +165,10 @@ 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. -jemalloc (tested as an LD_PRELOAD on GNU/Linux) reduces -overall fragmentation compared to glibc malloc in long-lived processes. -glibc malloc users may try setting C<MALLOC_MMAP_THRESHOLD_> to a lower -value (e.g. 131072) but that may require increasing the -C<sys.vm.max_map_count> sysctl. +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. =head2 Other OS tuning knobs |