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ebac4655 JA |
1 | fio |
2 | --- | |
3 | ||
79809113 JA |
4 | fio is a tool that will spawn a number of threads or processes doing a |
5 | particular type of io action as specified by the user. fio takes a | |
6 | number of global parameters, each inherited by the thread unless | |
7 | otherwise parameters given to them overriding that setting is given. | |
8 | The typical use of fio is to write a job file matching the io load | |
9 | one wants to simulate. | |
ebac4655 | 10 | |
2b02b546 JA |
11 | |
12 | Source | |
13 | ------ | |
14 | ||
15 | fio resides in a git repo, the canonical place is: | |
16 | ||
6b3eccb1 | 17 | git://git.kernel.dk/fio.git |
97f049c9 JA |
18 | |
19 | The http protocol also works, path is the same. | |
2b02b546 | 20 | |
79809113 JA |
21 | Snapshots are frequently generated and they include the git meta data as |
22 | well. You can download them here: | |
2b02b546 JA |
23 | |
24 | http://brick.kernel.dk/snaps/ | |
25 | ||
a68594cb JA |
26 | Pascal Bleser <guru@unixtech.be> has fio RPMs in his repository for |
27 | SUSE variants, you can find them here: | |
1053a106 JA |
28 | |
29 | http://linux01.gwdg.de/~pbleser/rpm-navigation.php?cat=System/fio | |
30 | ||
a68594cb JA |
31 | Dag Wieƫrs has RPMs for Red Hat related distros, find them here: |
32 | ||
33 | http://dag.wieers.com/rpm/packages/fio/ | |
34 | ||
244e170e JA |
35 | Mandriva has integrated fio into their package repository, so installing |
36 | on that distro should be as easy as typing 'urpmi fio'. | |
37 | ||
2b02b546 | 38 | |
726f6ff0 JA |
39 | Mailing list |
40 | ------------ | |
41 | ||
42 | There's a mailing list associated with fio. It's meant for general | |
43 | discussion, bug reporting, questions - basically anything that has to | |
44 | do with fio. An automated mail detailing recent commits is automatically | |
45 | sent to the list at most daily. The list address is fio-devel@kernel.dk, | |
46 | subscribe by sending an empty email to fio-devel+subscribe@kernel.dk. | |
47 | ||
48 | ||
bbfd6b00 JA |
49 | Building |
50 | -------- | |
51 | ||
52 | Just type 'make' and 'make install'. If on FreeBSD, for now you have to | |
5f421004 | 53 | specify the FreeBSD Makefile with -f and use gmake (not make), eg: |
bbfd6b00 | 54 | |
5f421004 | 55 | $ gmake -f Makefile.Freebsd && gmake -f Makefile.FreeBSD install |
bbfd6b00 | 56 | |
edffcb96 | 57 | Likewise with OpenSolaris, use the Makefile.solaris to compile there. |
5f421004 JA |
58 | The OpenSolaris make should work fine. This might change in the |
59 | future if I opt for an autoconf type setup. | |
bbfd6b00 | 60 | |
6de43c1b JA |
61 | If your compile fails with an error like this: |
62 | ||
63 | CC gettime.o | |
64 | In file included from fio.h:23, | |
65 | from gettime.c:8: | |
66 | os/os.h:15:20: error: libaio.h: No such file or directory | |
67 | In file included from gettime.c:8: | |
68 | fio.h:119: error: field 'iocb' has incomplete type | |
69 | make: *** [gettime.o] Error 1 | |
70 | ||
71 | Check that you have the libaio development package installed. On RPM | |
72 | based distros, it's typically called libaio-devel. | |
73 | ||
bbfd6b00 | 74 | |
972cfd25 JA |
75 | Command line |
76 | ------------ | |
ebac4655 JA |
77 | |
78 | $ fio | |
ee56ad50 | 79 | --debug Enable some debugging options (see below) |
b4692828 | 80 | --output Write output to file |
062c6022 | 81 | --timeout Runtime in seconds |
b4692828 JA |
82 | --latency-log Generate per-job latency logs |
83 | --bandwidth-log Generate per-job bandwidth logs | |
84 | --minimal Minimal (terse) output | |
85 | --version Print version info and exit | |
fd28ca49 JA |
86 | --help Print this page |
87 | --cmdhelp=cmd Print command help, "all" for all of them | |
cca73aa7 | 88 | --showcmd Turn a job file into command line options |
062c6022 | 89 | --readonly Turn on safety read-only checks, preventing writes |
e592a06b AC |
90 | --eta=when When ETA estimate should be printed |
91 | May be "always", "never" or "auto" | |
01f06b63 | 92 | --section=name Only run specified section in job file |
2b386d25 | 93 | --alloc-size=kb Set smalloc pool to this size in kb (def 1024) |
e592a06b | 94 | |
b4692828 JA |
95 | |
96 | Any parameters following the options will be assumed to be job files, | |
97 | unless they match a job file parameter. You can add as many as you want, | |
98 | each job file will be regarded as a separate group and fio will stonewall | |
99 | its execution. | |
972cfd25 | 100 | |
724e4435 JA |
101 | The --readonly switch is an extra safety guard to prevent accidentically |
102 | turning on a write setting when that is not desired. Fio will only write | |
103 | if rw=write/randwrite/rw/randrw is given, but this extra safety net can | |
104 | be used as an extra precaution. It will also enable a write check in the | |
105 | io engine core to prevent an accidental write due to a fio bug. | |
106 | ||
ee56ad50 JA |
107 | The debug switch allows adding options that trigger certain logging |
108 | options in fio. Currently the options are: | |
109 | ||
110 | process Dump info related to processes | |
111 | file Dump info related to file actions | |
112 | io Dump info related to IO queuing | |
113 | mem Dump info related to memory allocations | |
bd6f78b2 JA |
114 | blktrace Dump info related to blktrace setup |
115 | verify Dump info related to IO verification | |
116 | all Enable all debug options | |
811a0d06 | 117 | random Dump info related to random offset generation |
a3d741fa | 118 | parse Dump info related to option matching and parsing |
cd991b9e | 119 | diskutil Dump info related to disk utilization updates |
5e1d306e | 120 | job:x Dump info only related to job number x |
bd6f78b2 | 121 | ? or help Show available debug options. |
ee56ad50 JA |
122 | |
123 | You can specify as many as you want, eg --debug=file,mem will enable | |
bd6f78b2 | 124 | file and memory debugging. |
ee56ad50 | 125 | |
01f06b63 JA |
126 | The section switch is meant to make it easier to ship a bigger job file |
127 | instead of several smaller ones. Say you define a job file with light, | |
128 | moderate, and heavy parts. Then you can ask fio to run the given part | |
129 | only by giving it a --section=heavy command line option. The section | |
130 | option only applies to job sections, the reserved 'global' section is | |
131 | always parsed and taken into account. | |
132 | ||
2b386d25 JA |
133 | Fio has an internal allocator for shared memory called smalloc. It |
134 | allocates shared structures from this pool. The pool defaults to 1024k | |
135 | in size, and can grow to 32 pools. If running large jobs with randommap | |
136 | enabled it can run out of memory, in which case the --alloc-size switch | |
137 | is handy for starting with a larger pool size. | |
138 | ||
79809113 JA |
139 | |
140 | Job file | |
141 | -------- | |
142 | ||
71bfa161 | 143 | See the HOWTO file for a more detailed description of parameters and what |
4661f3d0 JA |
144 | they mean. This file contains the terse version. You can describe big and |
145 | complex setups with the command line, but generally it's a lot easier to | |
71bfa161 | 146 | just write a simple job file to describe the workload. The job file format |
4661f3d0 | 147 | is in the ini style format, as that is easy to read and write for the user. |
79809113 JA |
148 | |
149 | The job file parameters are: | |
ebac4655 | 150 | |
01452055 | 151 | name=x Use 'x' as the identifier for this job. |
61697c37 | 152 | description=x 'x' is a text description of the job. |
ebac4655 | 153 | directory=x Use 'x' as the top level directory for storing files |
b50b8755 JA |
154 | filename=x Force the use of 'x' as the filename for all files |
155 | in this thread. If not given, fio will make up | |
156 | a suitable filename based on the thread and file | |
157 | number. | |
3d60d1ed JA |
158 | rw=x 'x' may be: read, randread, write, randwrite, |
159 | rw (read-write mix), randrw (read-write random mix) | |
a6ccc7be JA |
160 | rwmixcycle=x Base cycle for switching between read and write |
161 | in msecs. | |
162 | rwmixread=x 'x' percentage of rw mix ios will be reads. If | |
163 | rwmixwrite is also given, the last of the two will | |
164 | be used if they don't add up to 100%. | |
165 | rwmixwrite=x 'x' percentage of rw mix ios will be writes. See | |
166 | rwmixread. | |
9ebc27e1 JA |
167 | rand_repeatable=x The sequence of random io blocks can be repeatable |
168 | across runs, if 'x' is 1. | |
ebac4655 JA |
169 | size=x Set file size to x bytes (x string can include k/m/g) |
170 | ioengine=x 'x' may be: aio/libaio/linuxaio for Linux aio, | |
78e7b3e7 JA |
171 | posixaio for POSIX aio, solarisaio for Solaris |
172 | native async IO, sync for regular read/write io, | |
1d2af02a JA |
173 | psync for regular pread/pwrite io, vsync for regular |
174 | readv/writev (with queuing emulation) mmap for mmap'ed | |
175 | io, syslet-rw for syslet driven read/write, splice for | |
d0c70934 GP |
176 | using splice/vmsplice, sg for direct SG_IO io, net |
177 | for network io, or cpuio for a cycler burner load. sg | |
1d2af02a JA |
178 | only works on Linux on SCSI (or SCSI-like devices, such |
179 | as usb-storage or sata/libata driven) devices. Fio also | |
180 | has a null io engine, which is mainly used for testing | |
181 | fio itself. | |
182 | ||
ebac4655 JA |
183 | iodepth=x For async io, allow 'x' ios in flight |
184 | overwrite=x If 'x', layout a write file first. | |
53cdc686 JA |
185 | nrfiles=x Spread io load over 'x' number of files per job, |
186 | if possible. | |
ebac4655 JA |
187 | prio=x Run io at prio X, 0-7 is the kernel allowed range |
188 | prioclass=x Run io at prio class X | |
189 | bs=x Use 'x' for thread blocksize. May include k/m postfix. | |
190 | bsrange=x-y Mix thread block sizes randomly between x and y. May | |
191 | also include k/m postfix. | |
192 | direct=x 1 for direct IO, 0 for buffered IO | |
193 | thinktime=x "Think" x usec after each io | |
194 | rate=x Throttle rate to x KiB/sec | |
195 | ratemin=x Quit if rate of x KiB/sec can't be met | |
196 | ratecycle=x ratemin averaged over x msecs | |
197 | cpumask=x Only allow job to run on CPUs defined by mask. | |
d2e268b0 | 198 | cpus_allowed=x Like 'cpumask', but allow text setting of CPU affinity. |
795407ca JA |
199 | fsync=x If writing with buffered IO, fsync after every |
200 | 'x' blocks have been written. | |
201 | end_fsync=x If 'x', run fsync() after end-of-job. | |
ebac4655 | 202 | startdelay=x Start this thread x seconds after startup |
03b74b3e | 203 | runtime=x Terminate x seconds after startup. Can include a |
906c8d75 JA |
204 | normal time suffix if not given in seconds, such as |
205 | 'm' for minutes, 'h' for hours, and 'd' for days. | |
ebac4655 JA |
206 | offset=x Start io at offset x (x string can include k/m/g) |
207 | invalidate=x Invalidate page cache for file prior to doing io | |
795407ca | 208 | sync=x Use sync writes if x and writing buffered IO. |
ebac4655 | 209 | mem=x If x == malloc, use malloc for buffers. If x == shm, |
795407ca JA |
210 | use shared memory for buffers. If x == mmap, use |
211 | anonymous mmap. | |
ebac4655 JA |
212 | exitall When one thread quits, terminate the others |
213 | bwavgtime=x Average bandwidth stats over an x msec window. | |
214 | create_serialize=x If 'x', serialize file creation. | |
215 | create_fsync=x If 'x', run fsync() after file creation. | |
f6cbb269 | 216 | unlink If set, unlink files when done. |
ebac4655 JA |
217 | loops=x Run the job 'x' number of times. |
218 | verify=x If 'x' == md5, use md5 for verifies. If 'x' == crc32, | |
219 | use crc32 for verifies. md5 is 'safer', but crc32 is | |
220 | a lot faster. Only makes sense for writing to a file. | |
221 | stonewall Wait for preceeding jobs to end before running. | |
222 | numjobs=x Create 'x' similar entries for this job | |
223 | thread Use pthreads instead of forked jobs | |
20dc95c4 JA |
224 | zonesize=x |
225 | zoneskip=y Zone options must be paired. If given, the job | |
226 | will skip y bytes for every x read/written. This | |
227 | can be used to gauge hard drive speed over the entire | |
228 | platter, without reading everything. Both x/y can | |
229 | include k/m/g suffix. | |
aea47d44 JA |
230 | iolog=x Open and read io pattern from file 'x'. The file must |
231 | contain one io action per line in the following format: | |
232 | rw, offset, length | |
233 | where with rw=0/1 for read/write, and the offset | |
234 | and length entries being in bytes. | |
843a7413 JA |
235 | write_iolog=x Write an iolog to file 'x' in the same format as iolog. |
236 | The iolog options are exclusive, if both given the | |
237 | read iolog will be performed. | |
ec94ec56 JA |
238 | write_bw_log Write a bandwidth log. |
239 | write_lat_log Write a latency log. | |
c04f7ec3 JA |
240 | lockmem=x Lock down x amount of memory on the machine, to |
241 | simulate a machine with less memory available. x can | |
242 | include k/m/g suffix. | |
b6f4d880 | 243 | nice=x Run job at given nice value. |
4e0ba8af JA |
244 | exec_prerun=x Run 'x' before job io is begun. |
245 | exec_postrun=x Run 'x' after job io has finished. | |
da86774e | 246 | ioscheduler=x Use ioscheduler 'x' for this job. |
b990b5c0 JA |
247 | cpuload=x For a CPU io thread, percentage of CPU time to attempt |
248 | to burn. | |
ba0fbe10 | 249 | cpuchunks=x Split burn cycles into pieces of x usecs. |
ebac4655 | 250 | |
79809113 | 251 | |
79809113 JA |
252 | Author |
253 | ------ | |
254 | ||
aae22ca7 | 255 | Fio was written by Jens Axboe <axboe@kernel.dk> to enable flexible testing |
79809113 JA |
256 | of the Linux IO subsystem and schedulers. He got tired of writing |
257 | specific test applications to simulate a given workload, and found that | |
258 | the existing io benchmark/test tools out there weren't flexible enough | |
259 | to do what he wanted. | |
260 | ||
aae22ca7 | 261 | Jens Axboe <axboe@kernel.dk> 20060905 |
79809113 | 262 |