int SI integer. A whole number value, which may contain a suffix
describing the base of the number. Accepted suffixes are k/m/g/t/p,
meaning kilo, mega, giga, tera, and peta. The suffix is not case
- sensitive. So if you want to specify 4096, you could either write
+ sensitive, and you may also include trailing 'b' (eg 'kb' is the same
+ as 'k'). So if you want to specify 4096, you could either write
out '4096' or just give 4k. The suffixes signify base 2 values, so
- 1024 is 1k and 1024k is 1m and so on. If the option accepts an upper
- and lower range, use a colon ':' or minus '-' to separate such values.
- May also include a prefix to indicate numbers base. If 0x is used,
- the number is assumed to be hexadecimal. See irange.
+ 1024 is 1k and 1024k is 1m and so on, unless the suffix is explicitly
+ set to a base 10 value using 'kib', 'mib', 'gib', etc. If that is the
+ case, then 1000 is used as the multiplier. This can be handy for
+ disks, since manufacturers generally use base 10 values when listing
+ the capacity of a drive. If the option accepts an upper and lower
+ range, use a colon ':' or minus '-' to separate such values. May also
+ include a prefix to indicate numbers base. If 0x is used, the number
+ is assumed to be hexadecimal. See irange.
bool Boolean. Usually parsed as an integer, however only defined for
true and false (1 and 0).
irange Integer range with suffix. Allows value range to be given, such
it in the header of each block.
crc32c-intel Use hardware assisted crc32c calcuation
- provided on SSE4.2 enabled processors.
+ provided on SSE4.2 enabled processors. Falls
+ back to regular software crc32c, if not
+ supported by the system.
crc32 Use a crc32 sum of the data area and store
it in the header of each block.
verify_async_cpus=str Tell fio to set the given CPU affinity on the
async IO verification threads. See cpus_allowed for the
format used.
+
+verify_backlog=int Fio will normally verify the written contents of a
+ job that utilizes verify once that job has completed. In
+ other words, everything is written then everything is read
+ back and verified. You may want to verify continually
+ instead for a variety of reasons. Fio stores the meta data
+ associated with an IO block in memory, so for large
+ verify workloads, quite a bit of memory would be used up
+ holding this meta data. If this option is enabled, fio
+ will verify the previously written blocks before continuing
+ to write new ones.
+
+verify_backlog_batch=int Control how many blocks fio will verify
+ if verify_backlog is set. If not set, will default to
+ the value of verify_backlog (meaning the entire queue
+ is read back and verified).
stonewall Wait for preceeding jobs in the job file to exit, before
starting this one. Can be used to insert serialization
to replay a workload captured by blktrace. See blktrace
for how to capture such logging data. For blktrace replay,
the file needs to be turned into a blkparse binary data
- file first (blktrace <device> -d file_for_fio.bin).
+ file first (blkparse <device> -o /dev/null -d file_for_fio.bin).
write_bw_log=str If given, write a bandwidth log of the jobs in this job
file. Can be used to store data of the bandwidth of the
the documentation that comes with the kernel, allowed values
are in the range of 100..1000.
+cgroup_nodelete=bool Normally fio will delete the cgroups it has created after
+ the job completion. To override this behavior and to leave
+ cgroups around after the job completion, set cgroup_nodelete=1.
+ This can be useful if one wants to inspect various cgroup
+ files after job completion. Default: false
+
uid=int Instead of running as the invoking user, set the user ID to
this value before the thread/process does any work.
projects / fio.git / blobdiff