Commit | Line | Data |
---|---|---|
da751ca9 JA |
1 | /* |
2 | * CPU engine | |
3 | * | |
4 | * Doesn't transfer any data, merely burns CPU cycles according to | |
5 | * the settings. | |
6 | * | |
7 | */ | |
5f350952 JA |
8 | #include "../fio.h" |
9 | #include "../os.h" | |
2866c82d | 10 | |
ba0fbe10 JA |
11 | static int fio_cpuio_queue(struct thread_data *td, struct io_u fio_unused *io_u) |
12 | { | |
2dc1bbeb | 13 | __usec_sleep(td->o.cpucycle); |
ba0fbe10 JA |
14 | return FIO_Q_COMPLETED; |
15 | } | |
16 | ||
ea2877a4 JA |
17 | static int fio_cpuio_setup(struct thread_data fio_unused *td) |
18 | { | |
ba0fbe10 | 19 | struct fio_file *f; |
af52b345 | 20 | unsigned int i; |
ba0fbe10 | 21 | |
2dc1bbeb JA |
22 | td->o.size = -1; |
23 | td->io_size = td->o.size; | |
ba0fbe10 JA |
24 | td->total_io_size = td->io_size; |
25 | ||
26 | for_each_file(td, f, i) { | |
27 | f->real_file_size = -1; | |
28 | f->file_size = -1; | |
29 | } | |
30 | ||
ea2877a4 JA |
31 | return 0; |
32 | } | |
33 | ||
2866c82d JA |
34 | static int fio_cpuio_init(struct thread_data *td) |
35 | { | |
2dc1bbeb JA |
36 | struct thread_options *o = &td->o; |
37 | ||
38 | if (!o->cpuload) { | |
ba0fbe10 | 39 | td_vmsg(td, EINVAL, "cpu thread needs rate (cpuload=)","cpuio"); |
2866c82d | 40 | return 1; |
ba0fbe10 JA |
41 | } |
42 | ||
2dc1bbeb JA |
43 | if (o->cpuload > 100) |
44 | o->cpuload = 100; | |
2866c82d | 45 | |
ba0fbe10 JA |
46 | /* |
47 | * set thinktime_sleep and thinktime_spin appropriately | |
48 | */ | |
2dc1bbeb JA |
49 | o->thinktime_blocks = 1; |
50 | o->thinktime_spin = 0; | |
51 | o->thinktime = (o->cpucycle * (100 - o->cpuload)) / o->cpuload; | |
2866c82d | 52 | |
2dc1bbeb | 53 | o->nr_files = o->open_files = 1; |
ba0fbe10 JA |
54 | return 0; |
55 | } | |
56 | ||
57 | static int fio_cpuio_open(struct thread_data fio_unused *td, struct fio_file *f) | |
58 | { | |
59 | f->fd = 0; | |
2866c82d JA |
60 | return 0; |
61 | } | |
62 | ||
5f350952 | 63 | static struct ioengine_ops ioengine = { |
2866c82d JA |
64 | .name = "cpuio", |
65 | .version = FIO_IOOPS_VERSION, | |
ba0fbe10 | 66 | .queue = fio_cpuio_queue, |
2866c82d | 67 | .init = fio_cpuio_init, |
ea2877a4 | 68 | .setup = fio_cpuio_setup, |
ba0fbe10 JA |
69 | .open_file = fio_cpuio_open, |
70 | .flags = FIO_SYNCIO | FIO_DISKLESSIO, | |
2866c82d | 71 | }; |
5f350952 JA |
72 | |
73 | static void fio_init fio_cpuio_register(void) | |
74 | { | |
75 | register_ioengine(&ioengine); | |
76 | } | |
77 | ||
78 | static void fio_exit fio_cpuio_unregister(void) | |
79 | { | |
80 | unregister_ioengine(&ioengine); | |
81 | } |