5. Detailed list of parameters
6. Normal output
7. Terse output
-
+8. Trace file format
1.0 Overview and history
------------------------
fio will divide this size between the available files
specified by the job. If not set, fio will use the full
size of the given files or devices. If the the files
- do not exist, size must be given.
+ do not exist, size must be given. It is also possible to
+ give size as a percentage between 1 and 100. If size=20%
+ is given, fio will use 20% of the full size of the given
+ files or devices.
filesize=int Individual file sizes. May be a range, in which case fio
will select sizes for files at random within the given range
for more info on GUASI.
+ rdma The RDMA I/O engine supports both RDMA
+ memory semantic(RDMA_WRITE/RDMA_READ) and
+ channel semantic(Send/Recv) in InfiniBand, RoCE
+ and iWarp environment.
+
external Prefix to specify loading an external
IO engine object file. Append the engine
filename, eg ioengine=external:/tmp/foo.o
direction, the output looks like:
Client1 (g=0): err= 0:
- write: io= 32MB, bw= 666KB/s, runt= 50320msec
+ write: io= 32MB, bw= 666KB/s, iops=89 , runt= 50320msec
slat (msec): min= 0, max= 136, avg= 0.03, stdev= 1.92
clat (msec): min= 0, max= 631, avg=48.50, stdev=86.82
bw (KB/s) : min= 0, max= 1196, per=51.00%, avg=664.02, stdev=681.68
io= Number of megabytes io performed
bw= Average bandwidth rate
+iops= Average IOs performed per second
runt= The runtime of that thread
slat= Submission latency (avg being the average, stdev being the
standard deviation). This is the time it took to submit
Additional Info (dependant on continue_on_error, default off): total # errors, first error code
Additional Info (dependant on description being set): Text description
+
+
+8.0 Trace file format
+---------------------
+There are two trace file format that you can encounter. The older (v1) format
+is unsupported since version 1.20-rc3 (March 2008). It will still be described
+below in case that you get an old trace and want to understand it.
+
+In any case the trace is a simple text file with a single action per line.
+
+
+8.1 Trace file format v1
+------------------------
+Each line represents a single io action in the following format:
+
+rw, offset, length
+
+where rw=0/1 for read/write, and the offset and length entries being in bytes.
+
+This format is not supported in Fio versions => 1.20-rc3.
+
+
+8.2 Trace file format v2
+------------------------
+The second version of the trace file format was added in Fio version 1.17.
+It allows to access more then one file per trace and has a bigger set of
+possible file actions.
+
+The first line of the trace file has to be:
+
+fio version 2 iolog
+
+Following this can be lines in two different formats, which are described below.
+
+The file management format:
+
+filename action
+
+The filename is given as an absolute path. The action can be one of these:
+
+add Add the given filename to the trace
+open Open the file with the given filename. The filename has to have
+ been added with the add action before.
+close Close the file with the given filename. The file has to have been
+ opened before.
+
+
+The file io action format:
+
+filename action offset length
+
+The filename is given as an absolute path, and has to have been added and opened
+before it can be used with this format. The offset and length are given in
+bytes. The action can be one of these:
+
+wait Wait for 'offset' microseconds. Everything below 100 is discarded.
+read Read 'length' bytes beginning from 'offset'
+write Write 'length' bytes beginning from 'offset'
+sync fsync() the file
+datasync fdatasync() the file
+trim trim the given file from the given 'offset' for 'length' bytes
projects / fio.git / blobdiff