Add log_avg_msec option

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index ac7e729c8b0fa86df12a0e68bfa75a01b4722929..c6304a7ca2ed7bf27b65df9ce844efa88f221534 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1101,6 +1101,18 @@ write_lat_log=str Same as write_bw_log, except that this option stores io
 write_bw_log=str If given, write an IOPS log of the jobs in this job
                file. See write_bw_log.
 
+write_iops_log=str Same as write_bw_log, but writes IOPS. If no filename is
+               given with this option, the default filename of
+               "jobname_type.log" is used. Even if the filename is given,
+               fio will still append the type of log.
+
+log_avg_msec=int By default, fio will log an entry in the iops, latency,
+               or bw log for every IO that completes. When writing to the
+               disk log, that can quickly grow to a very large size. Setting
+               this option makes fio average the each log entry over the
+               specified period of time, reducing the resolution of the log.
+               Defaults to 0.
+
 lockmem=int    Pin down the specified amount of memory with mlock(2). Can
                potentially be used instead of removing memory or booting
                with less memory to simulate a smaller amount of memory.