Add softrandommap and --alloc-size options

[fio.git] / README

diff --git a/README b/README
index 0b0cb7ef049a2686699cac067c42a2e0818e3d94..db8e6724ee7745d2c81f5ae2793ad6ebdd0f8d41 100644 (file)
--- a/README
+++ b/README
@@ -76,6 +76,7 @@ $ fio
        --eta=when      When ETA estimate should be printed
                        May be "always", "never" or "auto"
        --section=name  Only run specified section in job file
+       --alloc-size=kb Set smalloc pool to this size in kb (def 1024)
 
 
 Any parameters following the options will be assumed to be job files,
@@ -99,6 +100,9 @@ options in fio. Currently the options are:
        blktrace        Dump info related to blktrace setup
        verify          Dump info related to IO verification
        all             Enable all debug options
+       random          Dump info related to random offset generation
+       parse           Dump info related to option matching and parsing
+       diskutil        Dump info related to disk utilization updates
        ? or help       Show available debug options.
 
 You can specify as many as you want, eg --debug=file,mem will enable
@@ -111,6 +115,12 @@ only by giving it a --section=heavy command line option. The section
 option only applies to job sections, the reserved 'global' section is
 always parsed and taken into account.
 
+Fio has an internal allocator for shared memory called smalloc. It
+allocates shared structures from this pool. The pool defaults to 1024k
+in size, and can grow to 32 pools. If running large jobs with randommap
+enabled it can run out of memory, in which case the --alloc-size switch
+is handy for starting with a larger pool size.
+
 
 Job file
 --------