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Diffstat (limited to 'manual/tunables.texi')
| -rw-r--r-- | manual/tunables.texi | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/manual/tunables.texi b/manual/tunables.texi index 74ae253ebf..028868ded3 100644 --- a/manual/tunables.texi +++ b/manual/tunables.texi @@ -213,6 +213,18 @@ pre-fill the per-thread cache with. The default, or when set to zero, is no limit. @end deftp +@deftp Tunable glibc.malloc.mxfast +One of the optimizations malloc uses is to maintain a series of ``fast +bins'' that hold chunks up to a specific size. The default and +maximum size which may be held this way is 80 bytes on 32-bit systems +or 160 bytes on 64-bit systems. Applications which value size over +speed may choose to reduce the size of requests which are serviced +from fast bins with this tunable. Note that the value specified +includes malloc's internal overhead, which is normally the size of one +pointer, so add 4 on 32-bit systems or 8 on 64-bit systems to the size +passed to @code{malloc} for the largest bin size to enable. +@end deftp + @node Elision Tunables @section Elision Tunables @cindex elision tunables |