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Remove opt_dss and opt_mmap, such that if DSS allocation is enabled, both DSS

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and heap allocation are always enabled.
This commit is contained in:
Jason Evans
2009-12-29 00:09:15 -08:00
parent 5463a5298d
commit 6d7bb5357a
2 changed files with 20 additions and 92 deletions
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29
jemalloc/doc/jemalloc.3.in
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@@ -193,14 +193,6 @@ Double/halve the size of the maximum size class that is a multiple of the
cacheline size (64).
Above this size, subpage spacing (256 bytes) is used for size classes.
The default value is 512 bytes.
@roff_dss@.It D
@roff_dss@Use
@roff_dss@.Xr sbrk 2
@roff_dss@to acquire memory in the data storage segment (DSS).
@roff_dss@This option is enabled by default.
@roff_dss@See the
@roff_dss@.Dq M
@roff_dss@option for related information and interactions.
.It F
Double/halve the per-arena maximum number of dirty unused pages that are
allowed to accumulate before informing the kernel about at least half of those
@@ -237,22 +229,6 @@ will prevent any dirty unused pages from accumulating.
.It K
Double/halve the virtual memory chunk size.
The default chunk size is 1 MB.
@roff_dss@.It M
@roff_dss@Use
@roff_dss@.Xr mmap 2
@roff_dss@to acquire anonymously mapped memory.
@roff_dss@This option is enabled by default.
@roff_dss@If both the
@roff_dss@.Dq D
@roff_dss@and
@roff_dss@.Dq M
@roff_dss@options are enabled, the allocator prefers the DSS over anonymous
@roff_dss@mappings, but allocation only fails if memory cannot be acquired via
@roff_dss@either method.
@roff_dss@If neither option is enabled, then the
@roff_dss@.Dq M
@roff_dss@option is implicitly enabled in order to assure that there is a method
@roff_dss@for acquiring memory.
.It N
Double/halve the number of arenas.
The default number of arenas is two times the number of CPUs, or one if there
@@ -342,9 +318,8 @@ The default value is 128 bytes.
@roff_dss@This allocator uses both
@roff_dss@.Xr sbrk 2
@roff_dss@and
@roff_dss@.Xr mmap 2
@roff_dss@by default, but it can be configured at run time to use only one or
@roff_dss@the other.
@roff_dss@.Xr mmap 2 ,
@roff_dss@in that order of preference.
.Pp
This allocator uses multiple arenas in order to reduce lock contention for
threaded programs on multi-processor systems.