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1 | .TH fio 1 "September 2007" "User Manual" |
2 | .SH NAME | |
3 | fio \- flexible I/O tester | |
4 | .SH SYNOPSIS | |
5 | .B fio | |
6 | [\fIoptions\fR] [\fIjobfile\fR]... | |
7 | .SH DESCRIPTION | |
8 | .B fio | |
9 | is a tool that will spawn a number of threads or processes doing a | |
10 | particular type of I/O action as specified by the user. | |
11 | The typical use of fio is to write a job file matching the I/O load | |
12 | one wants to simulate. | |
13 | .SH OPTIONS | |
14 | .TP | |
15 | .BI \-\-output \fR=\fPfilename | |
16 | Write output to \fIfilename\fR. | |
17 | .TP | |
18 | .BI \-\-timeout \fR=\fPtimeout | |
19 | Limit run time to \fItimeout\fR seconds. | |
20 | .TP | |
21 | .B \-\-latency\-log | |
22 | Generate per-job latency logs. | |
23 | .TP | |
24 | .B \-\-bandwidth\-log | |
25 | Generate per-job bandwidth logs. | |
26 | .TP | |
27 | .B \-\-minimal | |
28 | Print statistics in a terse, semicolon\-delimited format. | |
29 | .TP | |
30 | .BI \-\-showcmd \fR=\fPjobfile | |
31 | Convert \fIjobfile\fR to a set of command-line options. | |
32 | .TP | |
33 | .B \-\-readonly | |
34 | Enable read-only safety checks. | |
35 | .TP | |
36 | .BI \-\-eta \fR=\fPwhen | |
37 | Specifies when real-time ETA estimate should be printed. \fIwhen\fR may | |
38 | be one of `always', `never' or `auto'. | |
39 | .TP | |
40 | .BI \-\-cmdhelp \fR=\fPcommand | |
41 | Print help information for \fIcommand\fR. May be `all' for all commands. | |
42 | .TP | |
43 | .B \-\-help | |
44 | Display usage information and exit. | |
45 | .TP | |
46 | .B \-\-version | |
47 | Display version information and exit. | |
48 | .SH "JOB FILE FORMAT" | |
49 | Job files are in `ini' format. They consist of one or more | |
50 | job definitions, which begin with a job name in square brackets and | |
51 | extend to the next job name. The job name can be any ASCII string | |
52 | except `global', which has a special meaning. Following the job name is | |
53 | a sequence of zero or more parameters, one per line, that define the | |
54 | behavior of the job. Any line starting with a `;' or `#' character is | |
55 | considered a comment and ignored. See section EXAMPLES for sample | |
56 | job files. | |
57 | .SS "Global Section" | |
58 | The global section contains default parameters for jobs specified in the | |
59 | job file. A job is only affected by global sections residing above it, | |
60 | and there may be any number of global sections. Specific job definitions | |
61 | may override any parameter set in global sections. | |
62 | .SH "JOB PARAMETERS" | |
63 | .SS Types | |
64 | Some parameters may take arguments of a specific type. The types used are: | |
65 | .TP | |
66 | .I str | |
67 | String: a sequence of alphanumeric characters. | |
68 | .TP | |
69 | .I int | |
70 | Integer: a whole number, possibly negative. If prefixed with `0x', the value | |
71 | is assumed to be base 16 (hexadecimal). | |
72 | .TP | |
73 | .I siint | |
74 | SI integer: a whole number, possibly containing a suffix denoting the base unit | |
75 | of the value. Accepted suffixes are `k', 'M' and 'G', denoting kilo (1024), | |
76 | mega (1024*1024) and giga (1024*1024*1024) respectively. | |
77 | .TP | |
78 | .I bool | |
79 | Boolean: a true or false value. `0' denotes false, `1' denotes true. | |
80 | .TP | |
81 | .I irange | |
82 | Integer range: a range of integers specified in the format | |
83 | \fIlower\fR:\fIupper\fR or \fIlower\fR-\fIupper\fR. \fIlower\fR and \fIupper\fR | |
84 | may contain a suffix as described above. If an option allows two sets of ranges, | |
85 | they are separated with a `,' or `/' character. For example: `8-8k/8M-4G'. | |
86 | .SS "Parameter List" | |
87 | .TP | |
88 | .BI name \fR=\fPstr | |
89 | May be used to override the job name. On the command line, this paramter | |
90 | has the special purpose of signalling the start of a new job. | |
91 | .TP | |
92 | .BI description \fR=\fPstr | |
93 | Human-readable description of the job. It is printed when the job is run, but | |
94 | otherwise has no special purpose. | |
95 | .TP | |
96 | .BI directory \fR=\fPstr | |
97 | Prefix filenames with this directory. Used to place files in a location other | |
98 | than `./'. | |
99 | .TP | |
100 | .BI filename \fR=\fPstr | |
101 | .B fio | |
102 | normally makes up a file name based on the job name, thread number, and file | |
103 | number. If you want to share files between threads in a job or several jobs, specify | |
104 | a \fIfilename\fR for each of them to override the default. If the I/O engine used is | |
105 | `net', \fIfilename\fR is the host and port to connect to in the format | |
106 | \fIhost\fR/\fIport\fR. If the I/O engine is file-based, you can specify a number of | |
107 | files by separating the names with a `:' character. `-' is a reserved name, meaning | |
108 | stdin or stdout, depending on the read/write direction set. | |
109 | .TP | |
110 | .BI opendir \fR=\fPstr | |
111 | Recursively open any files below directory \fIstr\fR. | |
112 | .TP | |
113 | .BI readwrite \fR=\fPstr "\fR,\fP rw" \fR=\fPstr | |
114 | Type of I/O pattern. Accepted values are: | |
115 | .RS | |
116 | .RS | |
117 | .TP | |
118 | .B read | |
119 | Sequential reads | |
120 | .TP | |
121 | .B write | |
122 | Sequential writes | |
123 | .TP | |
124 | .B randread | |
125 | Random reads | |
126 | .TP | |
127 | .B randwrite | |
128 | Random writes | |
129 | .TP | |
130 | .B rw | |
131 | Mixed sequential reads and writes | |
132 | .TP | |
133 | .B randrw | |
134 | Mixed random reads and writes | |
135 | .RE | |
136 | .P | |
137 | For mixed I/O, the default split is 50/50. For random I/O, the number of I/Os to | |
138 | perform before getting a new offset can be specified by appending `:\fIint\fR' to | |
139 | the pattern type. The default is 1. | |
140 | .RE | |
141 | .TP | |
142 | .BI randrepeat \fR=\fPbool | |
143 | Seed the random number generator in a predictable way so results are repeatable | |
144 | across runs. | |
145 | .TP | |
146 | .BI fadvise_hint \fR=\fPbool | |
147 | Disable use of \fIposix_fadvise\fR\|(2) to advise the kernel what I/O patters are | |
148 | likely to be issued. Default: true. | |
149 | .TP | |
150 | .BI size \fR=\fPsiint | |
151 | Total size of I/O for this job. \fBfio\fR will run until this many bytes have | |
152 | been transfered, unless limited by other options (\fBruntime\fR, for instance). | |
153 | Unless \fBnr_files\fR and \fBfilesize\fR options are given, this amount will be | |
154 | divided between the available files for the job. | |
155 | .TP | |
156 | .BI filesize \fR=\fPirange | |
157 | Individual file sizes. May be a range, in which case \fBfio\fR will select sizes | |
158 | for files at random within the given range, limited to \fBsize\fR in total (if that | |
159 | is given). If \fBfilesize\fR is not specified, each created file is the same size. | |
160 | .TP | |
161 | .BI blocksize \fR=\fPsiint "\fR,\fB bs" \fR=\fPsiint | |
162 | Block size for I/O units. Default: 4k. Values for reads and writes can be | |
163 | specified seperately in the format \fIread\fR,\fIwrite\fR, either of | |
164 | which may be empty to leave that value at its default. | |
165 | .TP | |
166 | .BI blocksize_range \fR=\fPirange "\fR,\fB bsrange" \fR=\fPirange | |
167 | Specify a range of I/O block sizes. The issued I/O unit will always be a multiple | |
168 | of the minimum size, unless \fBblocksize_unaligned\fR is set. Applied to both reads | |
169 | and writes, but can be specified seperately (see \fBblocksize\fR). | |
170 | .TP | |
171 | .B blocksize_unaligned\fR,\fP bs_unaligned | |
172 | If set, any size in \fBblocksize_range\fR may be used. This typically won't work | |
173 | with direct I/O, as that normally requires sector alignment. | |
174 | .TP | |
175 | .B zero_buffers | |
176 | Initialise buffers with all zeros. Default: fill buffers with random data. | |
177 | .TP | |
178 | .BI nrfiles \fR=\fPint | |
179 | Number of files to use for this job. Default: 1. | |
180 | .TP | |
181 | .BI openfiles \fR=\fPint | |
182 | Number of files to keep open at the same time. Default: \fBnrfiles\fR. | |
183 | .TP | |
184 | .BI file_service_type \fR=\fPstr | |
185 | Defines how files to service are selected. The following types are defined: | |
186 | .RS | |
187 | .RS | |
188 | .TP | |
189 | .B random | |
190 | Choose a file at random | |
191 | .TP | |
192 | .B roundrobin | |
193 | Round robin over open files (default). | |
194 | .RE | |
195 | .P | |
196 | The number of I/Os to issue before switching a new file can be specified by | |
197 | appending `:\fIint\fR' to the service type. | |
198 | .RE | |
199 | .TP | |
200 | .BI ioengine \fR=\fPstr | |
201 | Defines how the job issues I/O. The following types are defined: | |
202 | .RS | |
203 | .RS | |
204 | .TP | |
205 | .B sync | |
206 | Basic \fIread\fR\|(2) or \fIwrite\fR\|(2) I/O. \fIfseek\fR\|(2) is used to | |
207 | position the I/O location. | |
208 | .TP | |
209 | .B libaio | |
210 | Linux native asynchronous I/O. | |
211 | .TP | |
212 | .B posixaio | |
213 | glibc POSIX asynchronous I/O using \fIaio_read\fR\|(3) and \fIaio_write\fR\|(3). | |
214 | .TP | |
215 | .B mmap | |
216 | File is memory mapped with \fImmap\fR\|(2) and data coped using \fImemcpy\fR\|(3). | |
217 | .TP | |
218 | .B splice | |
219 | \fIsplice\fR\|(2) is used to transfer the data and \fIvmsplice\fR\|(2) to transfer | |
220 | data from user-space to the kernel. | |
221 | .TP | |
222 | .B syslet-rw | |
223 | Use the syslet system calls to make regular read/write asynchronous. | |
224 | .TP | |
225 | .B sg | |
226 | SCSI generic sg v3 I/O. May be either synchronous using the SG_IO ioctl, or if | |
227 | the target is an sg character device, we use \fIread\fR\|(2) and \fIwrite\fR\|(2) | |
228 | for asynchronous I/O. | |
229 | .TP | |
230 | .B null | |
231 | Doesn't transfer any data, just pretends to. Mainly used to exercise \fBfio\fR | |
232 | itself and for debugging and testing purposes. | |
233 | .TP | |
234 | .B net | |
235 | Transfer over the network. \fBfilename\fR must be set appropriately to | |
236 | `\fIhost\fR/\fIport\fR' regardless of data direction. If receiving, only the | |
237 | \fIport\fR argument is used. | |
238 | .TP | |
239 | .B netsplice | |
240 | Like \fBnet\fR, but uses \fIsplice\fR\|(2) and \fIvmsplice\fR\|(2) to map data | |
241 | and send/receive. | |
242 | .TP | |
243 | .B cpu | |
244 | Doesn't transfer any data, but burns CPU cycles according to \fBcpuload\fR and | |
245 | \fBcpucycles\fR parameters. | |
246 | .TP | |
247 | .B guasi | |
248 | The GUASI I/O engine is the Generic Userspace Asynchronous Syscall Interface | |
249 | approach to asycnronous I/O. | |
250 | ||
251 | See <http://www.xmailserver.org/guasi-lib.html>. | |
252 | .TP | |
253 | .B external | |
254 | Loads an external I/O engine object file. Append the engine filename as | |
255 | `:\fIenginepath\fR'. | |
256 | .RE | |
257 | .RE | |
258 | .TP | |
259 | .BI iodepth \fR=\fPint | |
260 | Number of I/O units to keep in flight against the file. Default: 1. | |
261 | .TP | |
262 | .BI iodepth_batch \fR=\fPint | |
263 | Number of I/Os to submit at once. Default: \fBiodepth\fR. | |
264 | .TP | |
265 | .BI iodepth_low \fR=\fPint | |
266 | Low watermark indicating when to start filling the queue again. Default: | |
267 | \fBiodepth\fR. | |
268 | .TP | |
269 | .BI direct \fR=\fPbool | |
270 | If true, use non-buffered I/O (usually O_DIRECT). Default: false. | |
271 | .TP | |
272 | .BI buffered \fR=\fPbool | |
273 | If true, use buffered I/O. This is the opposite of the \fBdirect\fR parameter. | |
274 | Default: true. | |
275 | .TP | |
276 | .BI offset \fR=\fPsiint | |
277 | Offset in the file to start I/O. Data before the offset will not be touched. | |
278 | .TP | |
279 | .BI fsync \fR=\fPint | |
280 | How many I/Os to perform before issuing an \fBfsync\fR\|(2) of dirty data. If 0, don't | |
281 | sync. Default: 0. | |
282 | .TP | |
283 | .BI overwrite \fR=\fPbool | |
284 | If writing, setup the file first and do overwrites. | |
285 | .TP | |
286 | .BI end_fsync \fR=\fPbool | |
287 | If true, sync file contents when job exits. | |
288 | .TP | |
289 | .BI fsync_on_close \fR=\fPbool | |
290 | If true, sync file contents on close. This differs from \fBend_fsync\fR in that | |
291 | it will happen on every close, not just at the end of the job. | |
292 | .TP | |
293 | .BI rwmixcycle \fR=\fPint | |
294 | How many milliseconds before switching between reads and writes for a mixed | |
295 | workload. Default: 500ms. | |
296 | .TP | |
297 | .BI rwmixread \fR=\fPint | |
298 | Percentage of a mixed workload that should be reads. Default: 50. | |
299 | .TP | |
300 | .BI rwmixwrite \fR=\fPint | |
301 | Percentage of a mixed workload that would be writes. If \fBrwmixread\fR and | |
302 | \fBwrmixwrite\fR are given and do not sum to 100%, the latter of the two | |
303 | overrides the first. | |
304 | .TP | |
305 | .B norandommap | |
306 | Normally \fBfio\fR will cover every block of the file when doing random I/O. If | |
307 | this parameter is given, a new offset will be chosen without looking at past | |
308 | I/O history. This parameter is mutually exclusive with \fBverify\fR. | |
309 | .TP | |
310 | .BI nice \fR=\fPint | |
311 | Run job with given nice value. See \fInice\fR\|(2). | |
312 | .TP | |
313 | .BI prio \fR=\fPint | |
314 | Set I/O priority value of this job between 0 (highest) and 7 (lowest). See | |
315 | \fIionice\fR\|(1). | |
316 | .TP | |
317 | .BI prioclass \fR=\fPint | |
318 | Set I/O priority class. See \fIionice\fR\|(1). | |
319 | .TP | |
320 | .BI thinktime \fR=\fPint | |
321 | Stall job for given number of microseconds between issuing I/Os. | |
322 | .TP | |
323 | .BI thinktime_spin \fR=\fPint | |
324 | Pretend to spend CPU time for given number of microseconds, sleeping the rest | |
325 | of the time specified by \fBthinktime\fR. Only valid if \fBthinktime\fR is set. | |
326 | .TP | |
327 | .BI thinktime_blocks \fR=\fPint | |
328 | Number of blocks to issue before waiting \fBthinktime\fR microseconds. | |
329 | Default: 1. | |
330 | .TP | |
331 | .BI rate \fR=\fPint | |
332 | Cap bandwidth used by this job to this number of KiB/s. | |
333 | .TP | |
334 | .BI ratemin \fR=\fPint | |
335 | Tell \fBfio\fR to do whatever it can to maintain at least the given bandwidth. | |
336 | Failing to meet this requirement will cause the job to exit. | |
337 | .TP | |
338 | .BI rate_iops \fR=\fPint | |
339 | Cap the bandwidth to this number of IOPS. If \fBblocksize\fR is a range, the | |
340 | smallest block size is used as the metric. | |
341 | .TP | |
342 | .BI rate_iops_min \fR=\fPint | |
343 | If this rate of I/O is not met, the job will exit. | |
344 | .TP | |
345 | .BI ratecycle \fR=\fPint | |
346 | Average bandwidth for \fBrate\fR and \fBratemin\fR over this number of | |
347 | milliseconds. Default: 1000ms. | |
348 | .TP | |
349 | .BI cpumask \fR=\fPint | |
350 | Set CPU affinity for this job. \fIint\fR is a bitmask of allowed CPUs the job | |
351 | may run on. See \fBsched_setaffinity\fR\|(2). | |
352 | .TP | |
353 | .BI cpus_allowed \fR=\fPstr | |
354 | Same as \fBcpumask\fR, but allows a comma-delimited list of CPU numbers. | |
355 | .TP | |
356 | .BI startdelay \fR=\fPint | |
357 | Delay start of job for the specified number of seconds. | |
358 | .TP | |
359 | .BI runtime \fR=\fPint | |
360 | Terminate processing after the specified number of seconds. | |
361 | .TP | |
362 | .B time_based | |
363 | If given, run for the specified \fBruntime\fR duration even if the files are | |
364 | completely read or written. The same workload will be repeated as many times | |
365 | as \fBruntime\fR allows. | |
366 | .TP | |
367 | .BI invalidate \fR=\fPbool | |
368 | Invalidate buffer-cache for the file prior to starting I/O. Default: true. | |
369 | .TP | |
370 | .BI sync \fR=\fPbool | |
371 | Use synchronous I/O for buffered writes. For the majority of I/O engines, | |
372 | this means using O_SYNC. | |
373 | .TP | |
374 | .BI iomem \fR=\fPstr "\fR,\fP mem" \fR=\fPstr | |
375 | Allocation method for I/O unit buffer. Allowed values are: | |
376 | .RS | |
377 | .RS | |
378 | .TP | |
379 | .B malloc | |
380 | Allocate memory with \fImalloc\fR\|(3). | |
381 | .TP | |
382 | .B shm | |
383 | Use shared memory buffers allocated through \fIshmget\fR\|(2). | |
384 | .TP | |
385 | .B shmhuge | |
386 | Same as \fBshm\fR, but use huge pages as backing. | |
387 | .TP | |
388 | .B mmap | |
389 | Use \fImmap\fR\|(2) for allocation. Uses anonymous memory unless a filename | |
390 | is given after the option in the format `:\fIfile\fR'. | |
391 | .TP | |
392 | .B mmaphuge | |
393 | Same as \fBmmap\fR, but use huge files as backing. | |
394 | .RE | |
395 | .P | |
396 | The amount of memory allocated is the maximum allowed \fBblocksize\fR for the | |
397 | job multiplied by \fBiodepth\fR. For \fBshmhuge\fR or \fBmmaphuge\fR to work, | |
398 | the system must have free huge pages allocated. \fBmmaphuge\fR also needs to | |
399 | have hugetlbfs mounted, and \fIfile\fR must point there. | |
400 | .RE | |
401 | .TP | |
402 | .BI hugepage-size \fR=\fPsiint | |
403 | Defines the size of a huge page. Must be at least equal to the system setting. | |
404 | Should be a multiple of 1MiB. Default: 4MiB. | |
405 | .TP | |
406 | .B exitall | |
407 | Terminate all jobs when one finishes. Default: wait for each job to finish. | |
408 | .TP | |
409 | .BI bwavgtime \fR=\fPint | |
410 | Average bandwidth calculations over the given time in milliseconds. Default: | |
411 | 500ms. | |
412 | .TP | |
413 | .BI create_serialize \fR=\fPbool | |
414 | If true, serialize file creation for the jobs. | |
415 | .TP | |
416 | .BI create_fsync \fR=\fPbool | |
417 | \fIfsync\fR\|(2) data file after creation. Default: true. | |
418 | .TP | |
419 | .BI unlink \fR=\fPbool | |
420 | Unlink job files when done. Default: false. | |
421 | .TP | |
422 | .BI loops \fR=\fPint | |
423 | Specifies the number of iterations (runs of the same workload) of this job. | |
424 | Default: 1. | |
425 | .TP | |
426 | .BI do_verify \fR=\fPbool | |
427 | Run the verify phase after a write phase. Only valid if \fBverify\fR is set. | |
428 | Default: true. | |
429 | .TP | |
430 | .BI verify \fR=\fPstr | |
431 | Method of verifying file contents after each iteration of the job. Allowed | |
432 | values are: | |
433 | .RS | |
434 | .RS | |
435 | .TP | |
436 | .B md5 crc16 crc32 crc64 crc7 sha256 sha512 | |
437 | Store appropriate checksum in the header of each block. | |
438 | .TP | |
439 | .B meta | |
440 | Write extra information about each I/O (timestamp, block number, etc.). The | |
441 | block number is verified. | |
442 | .TP | |
443 | .B pattern | |
444 | Fill I/O buffers with a specific pattern that is used to verify. The pattern is | |
445 | specified by appending `:\fIint\fR' to the parameter. \fIint\fR cannot be larger | |
446 | than 32-bits. | |
447 | .TP | |
448 | .B null | |
449 | Pretend to verify. Used for testing internals. | |
450 | .RE | |
451 | .RE | |
452 | .TP | |
453 | .BI verify_sort \fR=\fPbool | |
454 | If true, written verify blocks are sorted if \fBfio\fR deems it to be faster to | |
455 | read them back in a sorted manner. Default: true. | |
456 | .TP | |
457 | .BI verify_offset \fR=\fPsiint | |
458 | Swap the verification header with data somewhere else in the block before | |
459 | writing. It it swapped back before verifying. | |
460 | .TP | |
461 | .BI verify_interval \fR=\fPsiint | |
462 | Write the verification header for this number of bytes, which should divide | |
463 | \fBblocksize\fR. Default: \fBblocksize\fR. | |
464 | .TP | |
465 | .BI verify_fatal \fR=\fPbool | |
466 | If true, exit the job on the first observed verification failure. Default: | |
467 | false. | |
468 | .TP | |
469 | .B stonewall | |
470 | Wait for precedding jobs in the job file to exit before starting this one. | |
471 | \fBstonewall\fR implies \fBnew_group\fR. | |
472 | .TP | |
473 | .B new_group | |
474 | Start a new reporting group. If not given, all jobs in a file will be part | |
475 | of the same reporting group, unless separated by a stonewall. | |
476 | .TP | |
477 | .BI numjobs \fR=\fPint | |
478 | Number of clones (processes/threads performing the same workload) of this job. | |
479 | Default: 1. | |
480 | .TP | |
481 | .B group_reporting | |
482 | If set, display per-group reports instead of per-job when \fBnumjobs\fR is | |
483 | specified. | |
484 | .TP | |
485 | .B thread | |
486 | Use threads created with \fBpthread_create\fR\|(3) instead of processes created | |
487 | with \fBfork\fR\|(2). | |
488 | .TP | |
489 | .BI zonesize \fR=\fPsiint | |
490 | Divide file into zones of the specified size in bytes. See \fBzoneskip\fR. | |
491 | .TP | |
492 | .BI zoneskip \fR=\fPsiint | |
493 | Skip the specified number of bytes when \fBzonesize\fR bytes of data has been | |
494 | read. | |
495 | .TP | |
496 | .BI write_iolog \fR=\fPstr | |
497 | Write the issued I/O patterns to the specified file. | |
498 | .TP | |
499 | .BI read_iolog \fR=\fPstr | |
500 | Replay the I/O patterns contained in the specified file generated by | |
501 | \fBwrite_iolog\fR, or may be a \fBblktrace\fR binary file. | |
502 | .TP | |
503 | .B write_bw_log | |
504 | If given, write bandwidth logs of the jobs in this file. | |
505 | .TP | |
506 | .B write_lat_log | |
507 | Same as \fBwrite_bw_log\fR, but writes I/O completion latencies. | |
508 | .TP | |
509 | .BI lockmem \fR=\fPsiint | |
510 | Pin the specified amount of memory with \fBmlock\fR\|(2). Can be used to | |
511 | simulate a smaller amount of memory. | |
512 | .TP | |
513 | .BI exec_prerun \fR=\fPstr | |
514 | Before running the job, execute the specified command with \fBsystem\fR\|(3). | |
515 | .TP | |
516 | .BI exec_postrun \fR=\fPstr | |
517 | Same as \fBexec_prerun\fR, but the command is executed after the job completes. | |
518 | .TP | |
519 | .BI ioscheduler \fR=\fPstr | |
520 | Attempt to switch the device hosting the file to the specified I/O scheduler. | |
521 | .TP | |
522 | .BI cpuload \fR=\fPint | |
523 | If the job is a CPU cycle-eater, attempt to use the specified percentage of | |
524 | CPU cycles. | |
525 | .TP | |
526 | .BI cpuchunks \fR=\fPint | |
527 | If the job is a CPU cycle-eater, split the load into cycles of the | |
528 | given time in milliseconds. | |
529 | .TP | |
530 | .BI disk_util \fR=\fPbool | |
531 | Generate disk utilization statistics if the platform supports it. Default: true. | |
532 | .SH OUTPUT | |
533 | While running, \fBfio\fR will display the status of the created jobs. For example: | |
534 | .RS | |
535 | Threads: 1: [_r] [24.8% done] [ 13509/ 8334 kb/s] [eta 00h:01m:31s] | |
536 | .RE | |
537 | .P | |
538 | The characters in the first set of brackets denote the current status of each threads. | |
539 | The possible values are: | |
540 | .RS | |
541 | .RS | |
542 | .TP | |
543 | .B P | |
544 | Setup but not started. | |
545 | .TP | |
546 | .B C | |
547 | Thread created. | |
548 | .TP | |
549 | .B I | |
550 | Initialized, waiting. | |
551 | .TP | |
552 | .B R | |
553 | Running, doing sequential reads. | |
554 | .TP | |
555 | .B r | |
556 | Running, doing random reads. | |
557 | .TP | |
558 | .B W | |
559 | Running, doing sequential writes. | |
560 | .TP | |
561 | .B w | |
562 | Running, doing random writes. | |
563 | .TP | |
564 | .B M | |
565 | Running, doing mixed sequential reads/writes. | |
566 | .TP | |
567 | .B m | |
568 | Running, doing mixed random reads/writes. | |
569 | .TP | |
570 | .B F | |
571 | Running, currently waiting for \fBfsync\fR\|(2). | |
572 | .TP | |
573 | .B V | |
574 | Running, verifying written data. | |
575 | .TP | |
576 | .B E | |
577 | Exited, not reaped by main thread. | |
578 | .TP | |
579 | .B \- | |
580 | Exited, thread reaped. | |
581 | .RE | |
582 | .RE | |
583 | .P | |
584 | The second set of brackets shows the estimated completion percentage of | |
585 | the current group. The third set shows the read and write I/O rate, | |
586 | respectively. Finally, the estimated run time of the job is displayed. | |
587 | .P | |
588 | When \fBfio\fR completes (or is interrupted by Ctrl-C), it will show data | |
589 | for each thread, each group of threads, and each disk, in that order. | |
590 | .P | |
591 | Per-thread statistics first show the threads client number, group-id, and | |
592 | error code. The remaining figures are as follows: | |
593 | .RS | |
594 | .RS | |
595 | .TP | |
596 | .B io | |
597 | Number of megabytes of I/O performed. | |
598 | .TP | |
599 | .B bw | |
600 | Average data rate (bandwidth). | |
601 | .TP | |
602 | .B runt | |
603 | Threads run time. | |
604 | .TP | |
605 | .B slat | |
606 | Submission latency minimum, maximum, average and standard deviation. This is | |
607 | the time it took to submit the I/O. | |
608 | .TP | |
609 | .B clat | |
610 | Completion latency minimum, maximum, average and standard deviation. This | |
611 | is the time between submission and completion. | |
612 | .TP | |
613 | .B bw | |
614 | Bandwidth minimum, maximum, percentage of aggregate bandwidth received, average | |
615 | and standard deviation. | |
616 | .TP | |
617 | .B cpu | |
618 | CPU usage statistics. Includes user and system time, number of context switches | |
619 | this thread went through and number of major and minor page faults. | |
620 | .TP | |
621 | .B IO depths | |
622 | Distribution of I/O depths. Each depth includes everything less than (or equal) | |
623 | to it, but greater than the previous depth. | |
624 | .TP | |
625 | .B IO issued | |
626 | Number of read/write requests issued, and number of short read/write requests. | |
627 | .TP | |
628 | .B IO latencies | |
629 | Distribution of I/O completion latencies. The numbers follow the same pattern | |
630 | as \fBIO depths\fR. | |
631 | .RE | |
632 | .RE | |
633 | .P | |
634 | The group statistics show: | |
635 | .RS | |
636 | .RS | |
637 | .TP | |
638 | .B io | |
639 | Number of megabytes I/O performed. | |
640 | .TP | |
641 | .B aggrb | |
642 | Aggregate bandwidth of threads in the group. | |
643 | .TP | |
644 | .B minb | |
645 | Minimum average bandwidth a thread saw. | |
646 | .TP | |
647 | .B maxb | |
648 | Maximum average bandwidth a thread saw. | |
649 | .TP | |
650 | .B mint | |
651 | Smallest runtime of threads in the group. | |
652 | .TP | |
653 | .B maxt | |
654 | Longest runtime of threads in the group. | |
655 | .RE | |
656 | .RE | |
657 | .P | |
658 | Finally, disk statistics are printed with reads first: | |
659 | .RS | |
660 | .RS | |
661 | .TP | |
662 | .B ios | |
663 | Number of I/Os performed by all groups. | |
664 | .TP | |
665 | .B merge | |
666 | Number of merges in the I/O scheduler. | |
667 | .TP | |
668 | .B ticks | |
669 | Number of ticks we kept the disk busy. | |
670 | .TP | |
671 | .B io_queue | |
672 | Total time spent in the disk queue. | |
673 | .TP | |
674 | .B util | |
675 | Disk utilization. | |
676 | .RE | |
677 | .RE | |
678 | .SH TERSE OUTPUT | |
679 | If the \fB\-\-minimal\fR option is given, the results will be printed in a | |
680 | semicolon-delimited format suitable for scripted use. The fields are: | |
681 | .P | |
682 | .RS | |
683 | .B jobname, groupid, error | |
684 | .P | |
685 | Read status: | |
686 | .RS | |
687 | .B KiB I/O, bandwidth \fR(KiB/s)\fP, runtime \fR(ms)\fP | |
688 | .P | |
689 | Submission latency: | |
690 | .RS | |
691 | .B min, max, mean, standard deviation | |
692 | .RE | |
693 | Completion latency: | |
694 | .RS | |
695 | .B min, max, mean, standard deviation | |
696 | .RE | |
697 | Bandwidth: | |
698 | .RS | |
699 | .B min, max, aggregate percentage of total, mean, standard deviation | |
700 | .RE | |
701 | .RE | |
702 | .P | |
703 | Write status: | |
704 | .RS | |
705 | .B KiB I/O, bandwidth \fR(KiB/s)\fP, runtime \fR(ms)\fP | |
706 | .P | |
707 | Submission latency: | |
708 | .RS | |
709 | .B min, max, mean, standard deviation | |
710 | .RE | |
711 | Completion latency: | |
712 | .RS | |
713 | .B min, max, mean, standard deviation | |
714 | .RE | |
715 | Bandwidth: | |
716 | .RS | |
717 | .B min, max, aggregate percentage of total, mean, standard deviation | |
718 | .RE | |
719 | .RE | |
720 | .P | |
721 | CPU usage; | |
722 | .RS | |
723 | .B user, system, context switches | |
724 | .RE | |
725 | .P | |
726 | IO depth distribution: | |
727 | .RS | |
728 | .B <=1, 2, 4, 8, 16, 32, >=64 | |
729 | .RE | |
730 | .P | |
731 | IO latency distribution (ms): | |
732 | .RS | |
733 | .B <=2, 4, 10, 20, 50, 100, 250, 500, 750, 1000, >=2000 | |
734 | .RE | |
735 | .P | |
736 | .B text description | |
737 | .RE | |
738 | .SH AUTHORS | |
739 | .B fio | |
740 | was written by Jens Axboe <jens.axboe@oracle.com>. | |
741 | This man page was | |
742 | written by Aaron Carroll <aaronc@cse.unsw.edu.au> based | |
743 | on documentation by Jens Axboe. | |
744 | .SH "REPORTING BUGS" | |
745 | Report bugs to the \fBfio\fR mailing list <fio-devel@kernel.dk>. See \fBREADME\fR. | |
746 | .SH "SEE ALSO" | |
747 | Further documentation is available in \fBfio\fR's \fBHOWTO\fR and \fBREADME\fR. | |
748 | Sample jobfiles are available in \fBfio\fR's \fBexamples/\fR directory. | |
749 |