-l Generate per-job latency logs
-w Generate per-job bandwidth logs
-f <file> Read <file> for job descriptions
+ -h Print help info
-v Print version information and exit
The <jobs> format is as follows:
directory=x Use 'x' as the top level directory for storing files
- rw=x 'x' may be: read, randread, write, or randwrite
+ rw=x 'x' may be: read, randread, write, randwrite,
+ rw (read-write mix), randrw (read-write random mix)
size=x Set file size to x bytes (x string can include k/m/g)
ioengine=x 'x' may be: aio/libaio/linuxaio for Linux aio,
posixaio for POSIX aio, sync for regular read/write io,
- mmap for mmap'ed io, or sgio for direct SG_IO io. The
- latter only works on Linux on SCSI (or SCSI-like
- devices, such as usb-storage or sata/libata driven)
- devices.
+ mmap for mmap'ed io, splice for using splice/vmsplice,
+ or sgio for direct SG_IO io. The latter only works on
+ Linux on SCSI (or SCSI-like devices, such as
+ usb-storage or sata/libata driven) devices.
iodepth=x For async io, allow 'x' ios in flight
overwrite=x If 'x', layout a write file first.
prio=x Run io at prio X, 0-7 is the kernel allowed range
stonewall Wait for preceeding jobs to end before running.
numjobs=x Create 'x' similar entries for this job
thread Use pthreads instead of forked jobs
+ zonesize=x
+ zoneskip=y Zone options must be paired. If given, the job
+ will skip y bytes for every x read/written. This
+ can be used to gauge hard drive speed over the entire
+ platter, without reading everything. Both x/y can
+ include k/m/g suffix.
+ iolog=x Open and read io pattern from file 'x'. The file must
+ contain one io action per line in the following format:
+ rw, offset, length
+ where with rw=0/1 for read/write, and the offset
+ and length entries being in bytes.
Examples using a job file
projects / fio.git / blobdiff