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Add/correct missing command line options in help text
[fio.git]
/
HOWTO
diff --git
a/HOWTO
b/HOWTO
index ca095a322895be3065081db5bd600fb12609f3e7..d8c6b9414eef85be48779d7018682cf2bbd07470 100644
(file)
--- a/
HOWTO
+++ b/
HOWTO
@@
-344,6
+344,8
@@
ioengine=str Defines how the job issues io to the file. The following
psync Basic pread(2) or pwrite(2) io.
psync Basic pread(2) or pwrite(2) io.
+ vsync Basic readv(2) or writev(2) IO.
+
libaio Linux native asynchronous io.
posixaio glibc posix asynchronous io.
libaio Linux native asynchronous io.
posixaio glibc posix asynchronous io.
@@
-381,7
+383,10
@@
ioengine=str Defines how the job issues io to the file. The following
cycles according to the cpuload= and
cpucycle= options. Setting cpuload=85
will cause that job to do nothing but burn
cycles according to the cpuload= and
cpucycle= options. Setting cpuload=85
will cause that job to do nothing but burn
- 85% of the CPU.
+ 85% of the CPU. In case of SMP machines,
+ use numjobs=<no_of_cpu> to get desired CPU
+ usage, as the cpuload only loads a single
+ CPU at the desired rate.
guasi The GUASI IO engine is the Generic Userspace
Asyncronous Syscall Interface approach
guasi The GUASI IO engine is the Generic Userspace
Asyncronous Syscall Interface approach
@@
-402,8
+407,9
@@
iodepth=int This defines how many io units to keep in flight against
concurrency.
iodepth_batch=int This defines how many pieces of IO to submit at once.
concurrency.
iodepth_batch=int This defines how many pieces of IO to submit at once.
- It defaults to the same as iodepth, but can be set lower
- if one so desires.
+ It defaults to 1 which means that we submit each IO
+ as soon as it is available, but can be raised to submit
+ bigger batches of IO at the time.
iodepth_low=int The low water mark indicating when to start filling
the queue again. Defaults to the same as iodepth, meaning
iodepth_low=int The low water mark indicating when to start filling
the queue again. Defaults to the same as iodepth, meaning