The --alloc-size switch allows one to use a larger pool size for smalloc.
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. The pool size defaults to 16M and can grow to 8 pools.
+memory pool. The pool size defaults to 16MiB and can grow to 8 pools.
NOTE: While running .fio_smalloc.* backing store files are visible in /tmp.