-$ fio
- --debug Enable some debugging options (see below)
- --parse-only Parse options only, don't start any IO
- --output Write output to file
- --runtime Runtime in seconds
- --latency-log Generate per-job latency logs
- --bandwidth-log Generate per-job bandwidth logs
- --minimal Minimal (terse) output
- --output-format=type Output format (terse,json,normal)
- --terse-version=type Terse version output format (default 3, or 2 or 4).
- --version Print version info and exit
- --help Print this page
- --cpuclock-test Perform test/validation of CPU clock
- --cmdhelp=cmd Print command help, "all" for all of them
- --enghelp=engine Print ioengine help, or list available ioengines
- --enghelp=engine,cmd Print help for an ioengine cmd
- --showcmd Turn a job file into command line options
- --readonly Turn on safety read-only checks, preventing
- writes
- --eta=when When ETA estimate should be printed
- May be "always", "never" or "auto"
- --eta-newline=time Force a new line for every 'time' period passed
- --section=name Only run specified section in job file.
- Multiple sections can be specified.
- --alloc-size=kb Set smalloc pool to this size in kb (def 1024)
- --warnings-fatal Fio parser warnings are fatal
- --max-jobs Maximum number of threads/processes to support
- --server=args Start backend server. See Client/Server section.
- --client=host Connect to specified backend.
- --idle-prof=option Report cpu idleness on a system or percpu basis
- (option=system,percpu) or run unit work
- calibration only (option=calibrate).
-
-
-Any parameters following the options will be assumed to be job files,
-unless they match a job file parameter. You can add as many as you want,
-each job file will be regarded as a separate group and fio will stonewall
-its execution.
-
-The --readonly switch is an extra safety guard to prevent accidentally
-turning on a write setting when that is not desired. Fio will only write
-if rw=write/randwrite/rw/randrw is given, but this extra safety net can
-be used as an extra precaution. It will also enable a write check in the
-io engine core to prevent an accidental write due to a fio bug.
-
-The debug switch allows adding options that trigger certain logging
-options in fio. Currently the options are:
-
- process Dump info related to processes
- file Dump info related to file actions
- io Dump info related to IO queuing
- mem Dump info related to memory allocations
- blktrace Dump info related to blktrace setup
- verify Dump info related to IO verification
- all Enable all debug options
- random Dump info related to random offset generation
- parse Dump info related to option matching and parsing
- diskutil Dump info related to disk utilization updates
- job:x Dump info only related to job number x
- mutex Dump info only related to mutex up/down ops
- profile Dump info related to profile extensions
- time Dump info related to internal time keeping
- ? or help Show available debug options.
-
-You can specify as many as you want, eg --debug=file,mem will enable
-file and memory debugging.
-
-The section switch is meant to make it easier to ship a bigger job file
-instead of several smaller ones. Say you define a job file with light,
-moderate, and heavy parts. Then you can ask fio to run the given part
-only by giving it a --section=heavy command line option. The section
-option only applies to job sections, the reserved 'global' section is
-always parsed and taken into account.
-
-Fio has an internal allocator for shared memory called smalloc. It
-allocates shared structures from this pool. The pool defaults to 1024k
-in size, and can grow to 128 pools. If running large jobs with randommap
-enabled it can run out of memory, in which case the --alloc-size switch
-is handy for starting with a larger pool size. The backing store is
-files in /tmp. Fio cleans up after itself, while it is running you
-may see .fio_smalloc.* files in /tmp.
-
-
-Job file