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
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.
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.
replay_no_stall=int When replaying I/O with read_iolog the default behavior
is to attempt to respect the time stamps within the log and
- replay them with the appropriate delay between IOPS. By
+ replay them with the appropriate delay between IOPS. By
setting this variable fio will not respect the timestamps and
attempt to replay them as fast as possible while still
- respecting ordering. The result is the same I/O pattern to a
+ respecting ordering. The result is the same I/O pattern to a
given device, but different timings.
replay_redirect=str While replaying I/O patterns using read_iolog the
mapping. Replay_redirect causes all IOPS to be replayed onto
the single specified device regardless of the device it was
recorded from. i.e. replay_redirect=/dev/sdc would cause all
- IO in the blktrace to be replayed onto /dev/sdc. This means
- multiple devices will be replayed onto a single, if the trace
- contains multiple devices. If you want multiple devices to be
- replayed concurrently to multiple redirected devices you must
- blkparse your trace into separate traces and replay them with
- independent fio invocations. Unfortuantely this also breaks
- the strict time ordering between multiple device accesses.
+ IO in the blktrace or iolog to be replayed onto /dev/sdc.
+ This means multiple devices will be replayed onto a single
+ device, if the trace contains multiple devices. If you want
+ multiple devices to be replayed concurrently to multiple
+ redirected devices you must blkparse your trace into separate
+ traces and replay them with independent fio invocations.
+ Unfortuantely this also breaks the strict time ordering
+ between multiple device accesses.
replay_align=int Force alignment of IO offsets and lengths in a trace
to this power of 2 value.
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
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
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
[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
projects / fio.git / blobdiff