Add the file sharing bits

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index d8c6b9414eef85be48779d7018682cf2bbd07470..3e0a31b6767aadb1855471337b50bd8643767c59 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -219,6 +219,14 @@ filename=str       Fio normally makes up a filename based on the job name,
 opendir=str    Tell fio to recursively add any file it can find in this
                directory and down the file system tree.
 
+lockfile=bool  If set, fio will lock a file internally before doing IO to it.
+               This makes it safe to share file descriptors across fio
+               jobs that run at the same time.
+
+lockfile_batch=int     Acquiring a semaphore can be quite expensive, so
+               allow a process to complete this number of IOs before releasing
+               the semaphore again. Defaults to 1.
+
 readwrite=str
 rw=str         Type of io pattern. Accepted values are: