Fix crash with group_reporting and one group member that never started

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index 81c266b81bee2356092dafcfd5cb8b92e1d2d4df..df140cfe4ee0a06deaf5c81cc3349be7b00e9d6c 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -877,8 +877,10 @@ Pareto distribution
 .B gauss
 Normal (gaussian) distribution
 .TP
+.B zoned
+Zoned random distribution
+.TP
 .RE
-.P
 When using a \fBzipf\fR or \fBpareto\fR distribution, an input value is also
 needed to define the access pattern. For \fBzipf\fR, this is the zipf theta.
 For \fBpareto\fR, it's the pareto power. Fio includes a test program, genzipf,
@@ -887,6 +889,36 @@ hit rates. If you wanted to use \fBzipf\fR with a theta of 1.2, you would use
 random_distribution=zipf:1.2 as the option. If a non-uniform model is used,
 fio will disable use of the random map. For the \fBgauss\fR distribution, a
 normal deviation is supplied as a value between 0 and 100.
+.P
+.RS
+For a \fBzoned\fR distribution, fio supports specifying percentages of IO
+access that should fall within what range of the file or device. For example,
+given a criteria of:
+.P
+.RS
+60% of accesses should be to the first 10%
+.RE
+.RS
+30% of accesses should be to the next 20%
+.RE
+.RS
+8% of accesses should be to to the next 30%
+.RE
+.RS
+2% of accesses should be to the next 40%
+.RE
+.P
+we can define that through zoning of the random accesses. For the above
+example, the user would do:
+.P
+.RS
+.B random_distribution=zoned:60/10:30/20:8/30:2/40
+.RE
+.P
+similarly to how \fBbssplit\fR works for setting ranges and percentages of block
+sizes. Like \fBbssplit\fR, it's possible to specify separate zones for reads,
+writes, and trims. If just one set is given, it'll apply to all of them.
+.RE
 .TP
 .BI percentage_random \fR=\fPint
 For a random workload, set how big a percentage should be random. This defaults
@@ -1409,7 +1441,8 @@ fio_generate_plots script uses gnuplot to turn these text files into nice
 graphs. See \fBwrite_lat_log\fR for behaviour of given filename. For this
 option, the postfix is _bw.x.log, where x is the index of the job (1..N,
 where N is the number of jobs). If \fBper_job_logs\fR is false, then the
-filename will not include the job index.
+filename will not include the job index. See the \fBLOG FILE FORMATS\fR
+section.
 .TP
 .BI write_lat_log \fR=\fPstr
 Same as \fBwrite_bw_log\fR, but writes I/O completion latencies.  If no
@@ -1417,14 +1450,15 @@ filename is given with this option, the default filename of
 "jobname_type.x.log" is used, where x is the index of the job (1..N, where
 N is the number of jobs). Even if the filename is given, fio will still
 append the type of log. If \fBper_job_logs\fR is false, then the filename will
-not include the job index.
+not include the job index. See the \fBLOG FILE FORMATS\fR section.
 .TP
 .BI write_iops_log \fR=\fPstr
 Same as \fBwrite_bw_log\fR, but writes IOPS. If no filename is given with this
 option, the default filename of "jobname_type.x.log" is used, where x is the
 index of the job (1..N, where N is the number of jobs). Even if the filename
 is given, fio will still append the type of log. If \fBper_job_logs\fR is false,
-then the filename will not include the job index.
+then the filename will not include the job index. See the \fBLOG FILE FORMATS\fR
+section.
 .TP
 .BI log_avg_msec \fR=\fPint
 By default, fio will log an entry in the iops, latency, or bw log for every
@@ -2187,6 +2221,58 @@ the files over and load them from there.
 
 .RE
 
+.SH LOG FILE FORMATS
+
+Fio supports a variety of log file formats, for logging latencies, bandwidth,
+and IOPS. The logs share a common format, which looks like this:
+
+.B time (msec), value, data direction, offset
+
+Time for the log entry is always in milliseconds. The value logged depends
+on the type of log, it will be one of the following:
+
+.P
+.PD 0
+.TP
+.B Latency log
+Value is in latency in usecs
+.TP
+.B Bandwidth log
+Value is in KB/sec
+.TP
+.B IOPS log
+Value is in IOPS
+.PD
+.P
+
+Data direction is one of the following:
+
+.P
+.PD 0
+.TP
+.B 0
+IO is a READ
+.TP
+.B 1
+IO is a WRITE
+.TP
+.B 2
+IO is a TRIM
+.PD
+.P
+
+The \fIoffset\fR is the offset, in bytes, from the start of the file, for that
+particular IO. The logging of the offset can be toggled with \fBlog_offset\fR.
+
+If windowed logging is enabled though \fBlog_avg_msec\fR, then fio doesn't log
+individual IOs. Instead of logs the average values over the specified
+period of time. Since \fIdata direction\fR and \fIoffset\fR are per-IO values,
+they aren't applicable if windowed logging is enabled. If windowed logging
+is enabled and \fBlog_max_value\fR is set, then fio logs maximum values in
+that window instead of averages.
+
+.RE
+
 .SH CLIENT / SERVER
 Normally you would run fio as a stand-alone application on the machine
 where the IO workload should be generated. However, it is also possible to