Merge branch 'master' into gfio

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 6a880a7fc1053dc31b109fd15cc492767c1e977f..7dc7d4827e340dba61c3d67e53e78c1d83a973aa 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -285,6 +285,32 @@ filename=str       Fio normally makes up a filename based on the job name,
                stdin or stdout. Which of the two depends on the read/write
                direction set.
 
                stdin or stdout. Which of the two depends on the read/write
                direction set.
 

+filename_format=str
+               If sharing multiple files between jobs, it is usually necessary
+               to  have fio generate the exact names that you want. By default,
+               fio will name a file based on the default file format
+               specification of jobname.jobnumber.filenumber. With this
+               option, that can be customized. Fio will recognize and replace
+               the following keywords in this string:
+
+               $jobname
+                       The name of the worker thread or process.
+
+               $jobnum
+                       The incremental number of the worker thread or
+                       process.
+
+               $filenum
+                       The incremental number of the file for that worker
+                       thread or process.
+
+               To have dependent jobs share a set of files, this option can
+               be set to have fio generate filenames that are shared between
+               the two. For instance, if testfiles.$filenum is specified,
+               file number 4 for any job will be named testfiles.4. The
+               default of $jobname.$jobnum.$filenum will be used if
+               no other format specifier is given.
+

 opendir=str    Tell fio to recursively add any file it can find in this
                directory and down the file system tree.
 
 opendir=str    Tell fio to recursively add any file it can find in this
                directory and down the file system tree.
 


@@ -405,7 +431,7 @@ filesize=int        Individual file sizes. May be a range, in which case fio
 fill_device=bool
 fill_fs=bool   Sets size to something really large and waits for ENOSPC (no
                space left on device) as the terminating condition. Only makes
 fill_device=bool
 fill_fs=bool   Sets size to something really large and waits for ENOSPC (no
                space left on device) as the terminating condition. Only makes

-                sense with sequential write. For a read workload, the mount
+               sense with sequential write. For a read workload, the mount

                point will be filled first then IO started on the result. This
                option doesn't make sense if operating on a raw device node,
                since the size of that is already known by the file system.
                point will be filled first then IO started on the result. This
                option doesn't make sense if operating on a raw device node,
                since the size of that is already known by the file system.