Specifies when real-time ETA estimate should be printed. \fIwhen\fR may
be one of `always', `never' or `auto'.
.TP
+.BI \-\-eta\-newline \fR=\fPtime
+Force an ETA newline for every `time` period passed.
+.TP
+.BI \-\-status\-interval \fR=\fPtime
+Report full output status every `time` period passed.
+.TP
.BI \-\-readonly
Turn on safety read-only checks, preventing any attempted write.
.TP
.TP
.BI \-\-client \fR=\fPhost
Instead of running the jobs locally, send and run them on the given host.
+.TP
+.BI \-\-idle\-prof \fR=\fPoption
+Report cpu idleness on a system or percpu basis (\fIoption\fP=system,percpu) or run unit work calibration only (\fIoption\fP=calibrate).
.SH "JOB FILE FORMAT"
Job files are in `ini' format. They consist of one or more
job definitions, which begin with a job name in square brackets and
reserved name, meaning stdin or stdout, depending on the read/write direction
set.
.TP
+.BI filename_format \fR=\fPstr
+If sharing multiple files between jobs, it is usually necessary to have
+fio generate the exact names that you want. By default, fio will name a file
+based on the default file format specification of
+\fBjobname.jobnumber.filenumber\fP. With this option, that can be
+customized. Fio will recognize and replace the following keywords in this
+string:
+.RS
+.RS
+.TP
+.B $jobname
+The name of the worker thread or process.
+.TP
+.B $jobnum
+The incremental number of the worker thread or process.
+.TP
+.B $filenum
+The incremental number of the file for that worker thread or process.
+.RE
+.P
+To have dependent jobs share a set of files, this option can be set to
+have fio generate filenames that are shared between the two. For instance,
+if \fBtestfiles.$filenum\fR is specified, file number 4 for any job will
+be named \fBtestfiles.4\fR. The default of \fB$jobname.$jobnum.$filenum\fR
+will be used if no other format specifier is given.
+.RE
+.P
+.TP
.BI lockfile \fR=\fPstr
Fio defaults to not locking any files before it does IO to them. If a file or
file descriptor is shared, fio can serialize IO to that file to make the end
Read-write locking on the file. Many readers may access the file at the same
time, but writes get exclusive access.
.RE
-.P
-The option may be post-fixed with a lock batch number. If set, then each
-thread/process may do that amount of IOs to the file before giving up the lock.
-Since lock acquisition is expensive, batching the lock/unlocks will speed up IO.
.RE
.P
.BI opendir \fR=\fPstr
manufacturers like to use 10^3 or 1000 as a base ten unit instead, for obvious
reasons. Allow values are 1024 or 1000, with 1024 being the default.
.TP
+.BI unified_rw_reporting \fR=\fPbool
+Fio normally reports statistics on a per data direction basis, meaning that
+read, write, and trim are accounted and reported separately. If this option is
+set, the fio will sum the results and report them as "mixed" instead.
+.TP
.BI randrepeat \fR=\fPbool
Seed the random number generator in a predictable way so results are repeatable
across runs. Default: true.
same size.
.TP
.BI blocksize \fR=\fPint[,int] "\fR,\fB bs" \fR=\fPint[,int]
-Block size for I/O units. Default: 4k. Values for reads and writes can be
-specified separately in the format \fIread\fR,\fIwrite\fR, either of
-which may be empty to leave that value at its default.
+Block size for I/O units. Default: 4k. Values for reads, writes, and trims
+can be specified separately in the format \fIread\fR,\fIwrite\fR,\fItrim\fR
+either of which may be empty to leave that value at its default. If a trailing
+comma isn't given, the remainder will inherit the last value set.
.TP
.BI blocksize_range \fR=\fPirange[,irange] "\fR,\fB bsrange" \fR=\fPirange[,irange]
Specify a range of I/O block sizes. The issued I/O unit will always be a
This option is mutually exclusive with using a random map for files, so it
will turn off that option.
.TP
+.BI bs_is_seq_rand \fR=\fPbool
+If this option is set, fio will use the normal read,write blocksize settings as
+sequential,random instead. Any random read or write will use the WRITE
+blocksize settings, and any sequential read or write will use the READ
+blocksize setting.
+.TP
.B zero_buffers
Initialise buffers with all zeros. Default: fill buffers with random data.
.TP
Basic \fIreadv\fR\|(2) or \fIwritev\fR\|(2) I/O. Will emulate queuing by
coalescing adjacents IOs into a single submission.
.TP
+.B pvsync
+Basic \fIpreadv\fR\|(2) or \fIpwritev\fR\|(2) I/O.
+.TP
.B libaio
Linux native asynchronous I/O. This ioengine defines engine specific options.
.TP
random_distribution=zipf:1.2 as the option. If a non-uniform model is used,
fio will disable use of the random map.
.TP
+.BI percentage_random \fR=\fPint
+For a random workload, set how big a percentage should be random. This defaults
+to 100%, in which case the workload is fully random. It can be set from
+anywhere from 0 to 100. Setting it to 0 would make the workload fully
+sequential. It is possible to set different values for reads, writes, and
+trim. To do so, simply use a comma separated list. See \fBblocksize\fR.
+.TP
.B norandommap
Normally \fBfio\fR will cover every block of the file when doing random I/O. If
this parameter is given, a new offset will be chosen without looking at past
of the time specified by \fBthinktime\fR. Only valid if \fBthinktime\fR is set.
.TP
.BI thinktime_blocks \fR=\fPint
-Number of blocks to issue before waiting \fBthinktime\fR microseconds.
+Only valid if thinktime is set - control how many blocks to issue, before
+waiting \fBthinktime\fR microseconds. If not set, defaults to 1 which will
+make fio wait \fBthinktime\fR microseconds after every block. This
+effectively makes any queue depth setting redundant, since no more than 1 IO
+will be queued before we have to complete it and do our thinktime. In other
+words, this setting effectively caps the queue depth if the latter is larger.
Default: 1.
.TP
.BI rate \fR=\fPint
.TP
.BI lockmem \fR=\fPint
Pin the specified amount of memory with \fBmlock\fR\|(2). Can be used to
-simulate a smaller amount of memory.
+simulate a smaller amount of memory. The amount specified is per worker.
.TP
.BI exec_prerun \fR=\fPstr
Before running the job, execute the specified command with \fBsystem\fR\|(3).
+.RS
+Output is redirected in a file called \fBjobname.prerun.txt\fR
+.RE
.TP
.BI exec_postrun \fR=\fPstr
Same as \fBexec_prerun\fR, but the command is executed after the job completes.
+.RS
+Output is redirected in a file called \fBjobname.postrun.txt\fR
+.RE
.TP
.BI ioscheduler \fR=\fPstr
Attempt to switch the device hosting the file to the specified I/O scheduler.
.BI (net,netsplice)hostname \fR=\fPstr
The host name or IP address to use for TCP or UDP based IO.
If the job is a TCP listener or UDP reader, the hostname is not
-used and must be omitted.
+used and must be omitted unless it is a valid UDP multicast address.
.TP
.BI (net,netsplice)port \fR=\fPint
The TCP or UDP port to bind to or connect to.
.TP
+.BI (net,netsplice)interface \fR=\fPstr
+The IP address of the network interface used to send or receive UDP multicast
+packets.
+.TP
+.BI (net,netsplice)ttl \fR=\fPint
+Time-to-live value for outgoing UDP multicast packets. Default: 1
+.TP
+.BI (net,netsplice)nodelay \fR=\fPbool
+Set TCP_NODELAY on TCP connections.
+.TP
.BI (net,netsplice)protocol \fR=\fPstr "\fR,\fP proto" \fR=\fPstr
The network protocol to use. Accepted values are:
.RS
hostname must be omitted if this option is used.
.TP
.BI (net, pingpong) \fR=\fPbool
-Normal a network writer will just continue writing data, and a network reader
+Normaly a network writer will just continue writing data, and a network reader
will just consume packages. If pingpong=1 is set, a writer will send its normal
payload to the reader, then wait for the reader to send the same payload back.
This allows fio to measure network latencies. The submission and completion
latencies then measure local time spent sending or receiving, and the
completion latency measures how long it took for the other end to receive and
-send back.
+send back. For UDP multicast traffic pingpong=1 should only be set for a single
+reader when multiple readers are listening to the same address.
.TP
.BI (e4defrag,donorname) \fR=\fPstr
File will be used as a block donor (swap extents between files)