[PATCH] strtoul() -> strtol() conversion

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 6a7f58ed92d8fcc9e7a041e22b8a393c5786c425..1c8dd4ea3bc90681b4534c0d6a7e10d5ba5cc3c8 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -211,6 +211,9 @@ rw=str              Type of io pattern. Accepted values are:
                For certain types of io the result may still be skewed a bit,
                since the speed may be different.
 
+randrepeat=bool        For random IO workloads, seed the generator in a predictable
+               way so that results are repeatable across repetitions.
+
 size=siint     The total size of file io for this job. This may describe
                the size of the single file the job uses, or it may be
                divided between the number of files in the job. If the
@@ -319,7 +322,13 @@ prioclass=int      Set the io priority class. See man ionice(1).
 
 thinktime=int  Stall the job x microseconds after an io has completed before
                issuing the next. May be used to simulate processing being
-               done by an application.
+               done by an application. See thinktime_blocks.
+
+thinktime_blocks
+               Only valid if thinktime is set - control how many blocks
+               to issue, before waiting 'thinktime' usecs. If not set,
+               defaults to 1 which will make fio wait 'thinktime' usecs
+               after every block.
 
 rate=int       Cap the bandwidth used by this job to this number of KiB/sec.
 
@@ -359,8 +368,10 @@ mem=str            Fio can use various types of memory as the io unit buffer.
 
                        shmhuge Same as shm, but use huge pages as backing.
 
-                       mmap    Use anonymous memory maps as the buffers.
-                               Allocated through mmap(2).
+                       mmap    Use mmap to allocate buffers. May either be
+                               anonymous memory, or can be file backed if
+                               a filename is given after the option. The
+                               format is mem=mmap:/path/to/file.
 
                        mmaphuge Use a memory mapped huge file as the buffer
                                backing. Append filename after mmaphuge, ala
@@ -406,7 +417,7 @@ create_serialize=bool       If true, serialize the file creating for the jobs.
 create_fsync=bool      fsync the data file after creation. This is the
                        default.
 
-unlink         Unlink the job files when done. fio defaults to doing this,
+unlink=bool    Unlink the job files when done. fio defaults to doing this,
                if it created the file itself.
 
 loops=int      Run the specified number of iterations of this job. Used