X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=fio.1;h=696664afb0818d40e7d6d217b7af60ee10fefd05;hb=7be78a8a93b7d74d486859c2f782eb779dca6c12;hp=a9abe3fcec4e6a87cce2c425800d3e894d02ddb1;hpb=3e93fc256cb4156518ec9720cda0a3d9c777c6f8;p=fio.git

diff --git a/fio.1 b/fio.1
index a9abe3fc..696664af 100644
--- a/fio.1
+++ b/fio.1
@@ -1246,6 +1246,9 @@ multiple times. Thus it will not work on eg network or splice IO.
 .BI unlink \fR=\fPbool
 Unlink job files when done.  Default: false.
 .TP
+.BI unlink_each_loop \fR=\fPbool
+Unlink job files after each iteration or loop.  Default: false.
+.TP
 .BI loops \fR=\fPint
 Specifies the number of iterations (runs of the same workload) of this job.
 Default: 1.
@@ -1476,6 +1479,14 @@ 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. See the \fBLOG FILE FORMATS\fR section.
 .TP
+.BI write_hist_log \fR=\fPstr
+Same as \fBwrite_lat_log\fR, but writes I/O completion latency histograms. If
+no filename is given with this option, the default filename of
+"jobname_clat_hist.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. 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
@@ -1496,6 +1507,20 @@ If \fBlog_avg_msec\fR is set, fio logs the average over that window. If you
 instead want to log the maximum value, set this option to 1.  Defaults to
 0, meaning that averaged values are logged.
 .TP
+.BI log_hist_msec \fR=\fPint
+Same as \fBlog_avg_msec\fR, but logs entries for completion latency histograms.
+Computing latency percentiles from averages of intervals using \fBlog_avg_msec\fR
+is innacurate. Setting this option makes fio log histogram entries over the
+specified period of time, reducing log sizes for high IOPS devices while
+retaining percentile accuracy. See \fBlog_hist_coarseness\fR as well. Defaults
+to 0, meaning histogram logging is disabled.
+.TP
+.BI log_hist_coarseness \fR=\fPint
+Integer ranging from 0 to 6, defining the coarseness of the resolution of the
+histogram logs enabled with \fBlog_hist_msec\fR. For each increment in
+coarseness, fio outputs half as many bins. Defaults to 0, for which histogram
+logs contain 1216 latency bins. See the \fBLOG FILE FORMATS\fR section.
+.TP
 .BI log_offset \fR=\fPbool
 If this is set, the iolog options will include the byte offset for the IO
 entry as well as the other data values.
@@ -1695,13 +1720,13 @@ Some parameters are only valid when a specific ioengine is in use. These are
 used identically to normal parameters, with the caveat that when used on the
 command line, they must come after the ioengine.
 .TP
-.BI (cpu)cpuload \fR=\fPint
+.BI (cpuio)cpuload \fR=\fPint
 Attempt to use the specified percentage of CPU cycles.
 .TP
-.BI (cpu)cpuchunks \fR=\fPint
+.BI (cpuio)cpuchunks \fR=\fPint
 Split the load into cycles of the given time. In microseconds.
 .TP
-.BI (cpu)exit_on_io_done \fR=\fPbool
+.BI (cpuio)exit_on_io_done \fR=\fPbool
 Detect when IO threads are done, then exit.
 .TP
 .BI (libaio)userspace_reap
@@ -2302,6 +2327,13 @@ 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.
 
+For histogram logging the logs look like this:
+
+.B time (msec), data direction, block-size, bin 0, bin 1, ..., bin 1215
+
+Where 'bin i' gives the frequency of IO requests with a latency falling in
+the i-th bin. See \fBlog_hist_coarseness\fR for logging fewer bins.
+
 .RE
 
 .SH CLIENT / SERVER