opendir=str Tell fio to recursively add any file it can find in this
directory and down the file system tree.
+lockfile=str Fio defaults to not doing any locking files before it does
+ IO to them. If a file or file descriptor is shared, fio
+ can serialize IO to that file to make the end result
+ consistent. This is usual for emulating real workloads that
+ share files. The lock modes are:
+
+ none No locking. The default.
+ exclusive Only one thread/process may do IO,
+ excluding all others.
+ readwrite Read-write locking on the file. Many
+ readers may access the file at the
+ same time, but writes get exclusive
+ access.
+
+ The option may be post-fixed with a lock batch number. If
+ set, then each thread/process may do that amount of IOs to
+ the file before giving up the lock. Since lock acqusition is
+ expensive, batching the lock/unlocks will speed up IO.
+
readwrite=str
rw=str Type of io pattern. Accepted values are:
psync Basic pread(2) or pwrite(2) io.
- vsync Basic readv(2) or writev(3) IO.
+ vsync Basic readv(2) or writev(2) IO.
libaio Linux native asynchronous io.
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