cannot be modified. So random writes are not
possible. To imitate this, libhdfs engine
creates bunch of small files, and engine will
- pick a file out of those files based on the
- offset enerated by fio backend. Each jobs uses
+ pick a file out of those files based on the
+ offset generated by fio backend. Each jobs uses
it's own connection to HDFS.
mtd Read, write and erase an MTD character device
iodepth_batch_complete_min=1
iodepth_batch_complete_max=<iodepth>
- which means that we will retrieve at leat 1 IO and up to the
+ which means that we will retrieve at least 1 IO and up to the
whole submitted queue depth. If none of IO has been completed
yet, we will wait.
random Uniform random distribution
zipf Zipf distribution
pareto Pareto distribution
- gauss Normal (guassian) distribution
+ gauss Normal (gaussian) distribution
zoned Zoned random distribution
When using a zipf or pareto distribution, an input value
and random IO, at the given percentages. It is possible to
set different values for reads, writes, and trim. To do so,
simply use a comma separated list. See blocksize.
-
+
norandommap Normally fio will cover every block of the file when doing
random IO. If this option is given, fio will just get a
new random offset without looking at past io history. This
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
fio must be built on a system with libnuma-dev(el) installed.
numa_mem_policy=str Set this job's memory policy and corresponding NUMA
- nodes. Format of the argements:
+ nodes. Format of the arguments:
<mode>[:<nodelist>]
`mode' is one of the following memory policy:
default, prefer, bind, interleave, local
location should point there. So if it's mounted in /huge,
you would use mem=mmaphuge:/huge/somefile.
-iomem_align=int This indiciates the memory alignment of the IO memory buffers.
+iomem_align=int This indicates the memory alignment of the IO memory buffers.
Note that the given alignment is applied to the first IO unit
buffer, if using iodepth the alignment of the following buffers
are given by the bs used. In other words, if using a bs that is
starting the given IO operation. This will also clear
the 'invalidate' flag, since it is pointless to pre-read
and then drop the cache. This will only work for IO engines
- that are seekable, since they allow you to read the same data
+ that are seek-able, since they allow you to read the same data
multiple times. Thus it will not work on eg network or splice
IO.
crc32c Use a crc32c sum of the data area and store
it in the header of each block.
- crc32c-intel Use hardware assisted crc32c calcuation
+ crc32c-intel Use hardware assisted crc32c calculation
provided on SSE4.2 enabled processors. Falls
back to regular software crc32c, if not
supported by the system.
be a hex number that starts with either "0x" or "0X". Use
with verify=str. Also, verify_pattern supports %o format,
which means that for each block offset will be written and
- then verifyied back, e.g.:
+ then verified back, e.g.:
verify_pattern=%o
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.
+ Unfortunately 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.
connections rather than initiating an outgoing connection. The
hostname must be omitted if this option is used.
-[net] pingpong Normaly a network writer will just continue writing data, and
+[net] pingpong Normally 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
[e4defrag] inplace=int
Configure donor file blocks allocation strategy
0(default): Preallocate donor's file on init
- 1 : allocate space immidietly inside defragment event,
+ 1 : allocate space immediately inside defragment event,
and free right after event
[rbd] clustername=str Specifies the name of the Ceph cluster.
[rbd] rbdname=str Specifies the name of the RBD.
-[rbd] pool=str Specifies the naem of the Ceph pool containing RBD.
+[rbd] pool=str Specifies the name of the Ceph pool containing RBD.
[rbd] clientname=str Specifies the username (without the 'client.' prefix)
used to access the Ceph cluster. If the clustername is
- specified, the clientmae shall be the full type.id
+ specified, the clientname shall be the full type.id
string. If no type. prefix is given, fio will add
'client.' by default.
The offset is the offset, in bytes, from the start of the file, for that
particular IO. The logging of the offset can be toggled with 'log_offset'.
-If windowed logging is enabled though 'log_avg_msec', then fio doesn't log
+If windowed logging is enabled through 'log_avg_msec', then fio doesn't log
individual IOs. Instead of logs the average values over the specified
period of time. Since 'data direction' and 'offset' are per-IO values,
they aren't applicable if windowed logging is enabled. If windowed logging
is enabled and 'log_max_value' is set, then fio logs maximum values in
that window instead of averages.
-