1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
#include "cpucache.h"
#include "common/sysctl.h"
#include "common/strutil.h"
const char* ffDetectCPUCache(FFCPUCacheResult* result) {
// https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_system_capabilities#3901385
uint32_t nPerfLevels = (uint32_t) ffSysctlGetInt("hw.nperflevels", 0);
if (nPerfLevels <= 0) {
return "sysctl(hw.nperflevels) failed";
}
// macOS provides the global system cache line size
uint32_t lineSize = (uint32_t) ffSysctlGetInt64("hw.cachelinesize", 0);
char sysctlKey[128] = "hw.perflevelN.";
char* pNum = sysctlKey + strlen("hw.perflevel");
char* pSubkey = sysctlKey + strlen("hw.perflevelN.");
const size_t lenLeft = ARRAY_SIZE(sysctlKey) - strlen("hw.perflevelN.");
for (uint32_t i = 0; i < nPerfLevels; ++i) {
*pNum = (char) ('0' + i);
ffStrCopy(pSubkey, "physicalcpu", lenLeft);
uint32_t ncpu = (uint32_t) ffSysctlGetInt(sysctlKey, 0);
if (ncpu <= 0) {
continue;
}
ffStrCopy(pSubkey, "l1icachesize", lenLeft);
uint32_t size = (uint32_t) ffSysctlGetInt(sysctlKey, 0);
if (size) {
ffCPUCacheAddItem(result, 1, size, lineSize, FF_CPU_CACHE_TYPE_INSTRUCTION)->num = ncpu;
}
ffStrCopy(pSubkey, "l1dcachesize", lenLeft);
size = (uint32_t) ffSysctlGetInt(sysctlKey, 0);
if (size) {
ffCPUCacheAddItem(result, 1, size, lineSize, FF_CPU_CACHE_TYPE_DATA)->num = ncpu;
}
ffStrCopy(pSubkey, "l2cachesize", lenLeft);
size = (uint32_t) ffSysctlGetInt(sysctlKey, 0);
if (size) {
ffStrCopy(pSubkey, "cpusperl2", lenLeft);
uint32_t cpuSper = (uint32_t) ffSysctlGetInt(sysctlKey, 0);
if (cpuSper) {
ffCPUCacheAddItem(result, 2, size, lineSize, FF_CPU_CACHE_TYPE_UNIFIED)->num = ncpu / cpuSper;
}
}
ffStrCopy(pSubkey, "l3cachesize", lenLeft);
size = (uint32_t) ffSysctlGetInt(sysctlKey, 0);
if (size) {
ffStrCopy(pSubkey, "cpusperl3", lenLeft);
uint32_t cpuSper = (uint32_t) ffSysctlGetInt(sysctlKey, 0);
if (cpuSper) {
ffCPUCacheAddItem(result, 3, size, lineSize, FF_CPU_CACHE_TYPE_UNIFIED)->num = ncpu / cpuSper;
}
}
}
return NULL;
}
|
