directory=x Use 'x' as the top level directory for storing files
rw=x 'x' may be: read, randread, write, randwrite,
rw (read-write mix), randrw (read-write random mix)
+ rwmixcycle=x Base cycle for switching between read and write
+ in msecs.
+ rwmixread=x 'x' percentage of rw mix ios will be reads. If
+ rwmixwrite is also given, the last of the two will
+ be used if they don't add up to 100%.
+ rwmixwrite=x 'x' percentage of rw mix ios will be writes. See
+ rwmixread.
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
bwavgtime=x Average bandwidth stats over an x msec window.
create_serialize=x If 'x', serialize file creation.
create_fsync=x If 'x', run fsync() after file creation.
+ end_fsync=x If 'x', run fsync() after end-of-job.
loops=x Run the job 'x' number of times.
verify=x If 'x' == md5, use md5 for verifies. If 'x' == crc32,
use crc32 for verifies. md5 is 'safer', but crc32 is
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.
+ lockmem=x Lock down x amount of memory on the machine, to
+ simulate a machine with less memory available. x can
+ include k/m/g suffix.
+ nice=x Run job at given nice value.
Examples using a job file
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