[PATCH] Support for specifying exact io pattern
[fio.git] / README
diff --git a/README b/README
index 3cf3f13395414bcbcf19c0b6246092fd7216455e..f6094a62f2d84e63289fb60ce1b90da82fc737d3 100644 (file)
--- a/README
+++ b/README
@@ -86,6 +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