莎拉杜蒙个人资料:Cross-platform function to get your cache line size | Nick Strupat

#ifndef GET_CACHE_LINE_SIZE_H_INCLUDED
#define GET_CACHE_LINE_SIZE_H_INCLUDED
 
// Author: Nick Strupat
// Date: October 29, 2010
// Returns the cache line size (in bytes) of the processor, or 0 on failure
 
#include 
size_t cache_line_size();
 
#if defined(__APPLE__)
 
#include 
size_t cache_line_size() {
size_t line_size = 0;
size_t sizeof_line_size = sizeof(line_size);
sysctlbyname("hw.cachelinesize", &line_size, &sizeof_line_size, 0, 0);
return line_size;
}
 
#elif defined(_WIN32)
 
#include 
#include 
size_t cache_line_size() {
size_t line_size = 0;
DWORD buffer_size = 0;
DWORD i = 0;
SYSTEM_LOGICAL_PROCESSOR_INFORMATION * buffer = 0;
 
GetLogicalProcessorInformation(0, &buffer_size);
buffer = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION *)malloc(buffer_size);
GetLogicalProcessorInformation(&buffer[0], &buffer_size);
 
for (i = 0; i != buffer_size / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION); ++i) {
if (buffer[i].Relationship == RelationCache && buffer[i].Cache.Level == 1) {
line_size = buffer[i].Cache.LineSize;
break;
}
}
 
free(buffer);
return line_size;
}
 
#elif defined(linux)
 
#include 
size_t cache_line_size() {
FILE * p = 0;
p = fopen("/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size", "r");
unsigned int i = 0;
if (p) {
fscanf(p, "%d", &i);
fclose(p);
}
return i;
}
 
#else
#error Unrecognized platform
#endif
 
#endif

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