X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=HOWTO;h=7dc7d4827e340dba61c3d67e53e78c1d83a973aa;hb=ba9c7219eefcc04e84a4fb4970f4b5caeaf48aa6;hp=14417342761f9e2c39abb7f512a4e60a96c453f9;hpb=90b7a96d9573a14f20470af2aa0dd4e60611a477;p=fio.git

diff --git a/HOWTO b/HOWTO
index 14417342..7dc7d482 100644
--- a/HOWTO
+++ b/HOWTO
@@ -9,6 +9,7 @@ Table of contents
 6. Normal output
 7. Terse output
 8. Trace file format
+9. CPU idleness profiling
 
 1.0 Overview and history
 ------------------------
@@ -284,6 +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.
 
+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.
 
@@ -301,11 +328,6 @@ lockfile=str	Fio defaults to not locking any files before it does
 					same time, but writes get exclusive
 					access.
 
-		The option may be post-fixed with a lock batch number. If
-		set, then each thread/process may do that amount of IOs to
-		the file before giving up the lock. Since lock acquisition is
-		expensive, batching the lock/unlocks will speed up IO.
-
 readwrite=str
 rw=str		Type of io pattern. Accepted values are:
 
@@ -409,7 +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
-                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.
@@ -775,7 +797,7 @@ random_generator=str	Fio supports the following engines for generating
 		block sizes, not with workloads that use multiple block
 		sizes. If used with such a workload, fio may read or write
 		some blocks multiple times.
-		
+
 nice=int	Run the job with the given nice value. See man nice(2).
 
 prio=int	Set the io priority value of this job. Linux limits us to