[PATCH] Support for specifying exact io pattern

[fio.git] / README

diff --git a/README b/README
index 9121d4cf914795b8cb9d745b58066a62a7788681..f6094a62f2d84e63289fb60ce1b90da82fc737d3 100644 (file)
--- a/README
+++ b/README
@@ -33,12 +33,14 @@ $ fio
        -l Generate per-job latency logs
        -w Generate per-job bandwidth logs
        -f <file> Read <file> for job descriptions
+       -h Print help info
        -v Print version information and exit
 
 The <jobs> format is as follows:
 
        directory=x     Use 'x' as the top level directory for storing files
-       rw=x            'x' may be: read, randread, write, or randwrite
+       rw=x            'x' may be: read, randread, write, randwrite,
+                       rw (read-write mix), randrw (read-write random mix)
        size=x          Set file size to x bytes (x string can include k/m/g)
        ioengine=x      'x' may be: aio/libaio/linuxaio for Linux aio,
                        posixaio for POSIX aio, sync for regular read/write io,
@@ -84,6 +86,11 @@ The <jobs> format is as follows:
                        can be used to gauge hard drive speed over the entire
                        platter, without reading everything. Both x/y can
                        include k/m/g suffix.
+       iolog=x         Open and read io pattern from file 'x'. The file must
+                       contain one io action per line in the following format:
+                       rw, offset, length
+                       where with rw=0/1 for read/write, and the offset
+                       and length entries being in bytes.
 
 
 Examples using a job file