path: root/HOWTO
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authorVincent Fu <>2019-09-11 10:56:39 -0400
committerJens Axboe <>2019-09-11 09:00:16 -0600
commit4a4199035ee07da312b5a611637a164ebe8a4805 (patch)
tree184790e3920ac18c065966b7b9dd43c64214692b /HOWTO
parent27f436d9f72a9d2d3da3adfdf712757152eab29e (diff)
doc: clarify what --alloc-size does
The alloc-size option actually directs fio to allocate additional shared memory pools of the specified size, augmenting the default allocation. Signed-off-by: Jens Axboe <>
Diffstat (limited to 'HOWTO')
1 files changed, 2 insertions, 2 deletions
diff --git a/HOWTO b/HOWTO
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@@ -222,8 +222,8 @@ Command line options
.. option:: --alloc-size=kb
- Set the internal smalloc pool size to `kb` in KiB. The
- ``--alloc-size`` switch allows one to use a larger pool size for smalloc.
+ Allocate additional internal smalloc pools of size `kb` in KiB. The
+ ``--alloc-size`` option increases shared memory set aside for use by fio.
If running large jobs with randommap enabled, fio can run out of memory.
Smalloc is an internal allocator for shared structures from a fixed size
memory pool and can grow to 16 pools. The pool size defaults to 16MiB.