X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=HOWTO;h=cf1024cff4dbb2a7f8ee888cae6d21d511b5096d;hp=a7d6db4d84b6489380f2aff41f3ff6d8fc6b49a8;hb=24a2bb13ec8e449fd5e30967420894f88cdad11a;hpb=769d13b5c5c4948c89311b55bce26cec4196e3d1

diff --git a/HOWTO b/HOWTO
index a7d6db4d..cf1024cf 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1066,6 +1066,10 @@ random_generator=str	Fio supports the following engines for generating
 
 nice=int	Run the job with the given nice value. See man nice(2).
 
+     On Windows, values less than -15 set the process class to "High";
+     -1 through -15 set "Above Normal"; 1 through 15 "Below Normal";
+     and above 15 "Idle" priority class.
+
 prio=int	Set the io priority value of this job. Linux limits us to
 		a positive value between 0 and 7, with 0 being the highest.
 		See man ionice(1). Refer to an appropriate manpage for
@@ -1295,7 +1299,7 @@ iopsavgtime=int	Average the calculated IOPS over the given time. Value
 		through 'write_iops_log', then the minimum of this option and
 		'log_avg_msec' will be used.  Default: 500ms.
 
-create_serialize=bool	If true, serialize the file creating for the jobs.
+create_serialize=bool	If true, serialize the file creation for the jobs.
 			This may be handy to avoid interleaving of data
 			files, which may greatly depend on the filesystem
 			used and even the number of processors in the system.
@@ -1334,6 +1338,8 @@ unlink=bool	Unlink the job files when done. Not the default, as repeated
 		runs of that job would then waste time recreating the file
 		set again and again.
 
+unlink_each_loop=bool	Unlink job files after each iteration or loop.
+
 loops=int	Run the specified number of iterations of this job. Used
 		to repeat the same workload a given number of times. Defaults
 		to 1.
@@ -1606,10 +1612,18 @@ write_lat_log=str Same as write_bw_log, except that this option stores io
 		The actual log names will be foo_slat.x.log, foo_clat.x.log,
 		and foo_lat.x.log, where x is the index of the job (1..N,
 		where N is the number of jobs). This helps fio_generate_plot
-		fine the logs automatically. If 'per_job_logs' is false, then
+		find the logs automatically. If 'per_job_logs' is false, then
 		the filename will not include the job index. See 'Log File
 		Formats'.
 
+write_hist_log=str Same as write_lat_log, 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 per_job_logs is false, then the filename will not include the
+		job index. See 'Log File Formats'.
+
 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.x.log" is used,where x is the index of the job
@@ -1625,6 +1639,20 @@ log_avg_msec=int By default, fio will log an entry in the iops, latency,
 		specified period of time, reducing the resolution of the log.
 		See log_max_value as well. Defaults to 0, logging all entries.
 
+log_hist_msec=int Same as log_avg_msec, but logs entries for completion
+		latency histograms. Computing latency percentiles from averages of
+		intervals using log_avg_msec 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 log_hist_coarseness as well. Defaults to 0, meaning histogram
+		logging is disabled.
+
+log_hist_coarseness=int Integer ranging from 0 to 6, defining the coarseness
+		of the resolution of the histogram logs enabled with log_hist_msec. For
+		each increment in coarseness, fio outputs half as many bins. Defaults to
+		0, for which histogram logs contain 1216 latency bins. See
+		'Log File Formats'.
+
 log_max_value=bool	If log_avg_msec 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
@@ -1657,6 +1685,10 @@ log_store_compressed=bool	If set, fio will store the log files in a
 		the --inflate-log command line parameter. The files will be
 		stored with a .fz suffix.
 
+log_unix_epoch=bool	If set, fio will log Unix timestamps to the log
+		files produced by enabling write_type_log for each log type, instead
+		of the default zero-based timestamps.
+
 block_error_percentiles=bool	If set, record errors in trim block-sized
 		units from writes and trims and output a histogram of
 		how many trims it took to get to errors, and what kind
@@ -1927,7 +1959,7 @@ be the starting port number since fio will use a range of ports.
 [mtd] skip_bad=bool	Skip operations against known bad blocks.
 
 [libhdfs] hdfsdirectory	libhdfs will create chunk in this HDFS directory
-[libhdfs] chunck_size	the size of the chunck to use for each file.
+[libhdfs] chunk_size	the size of the chunk to use for each file.
 
 
 6.0 Interpreting the output