Linux 获取内存页大小

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1. [root@localhost nginx-1.8.0]# getconf PAGESIZE
   
2. 4096
   
3. [root@localhost nginx-1.8.0]# getconf PAGE_SIZE
   
4. 4096

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1. The function getpagesize() returns the number of bytes in a page, where a "page" is the thing used where it says in the description of mmap(2) that files are mapped in page-sized units.
2. 
   
3. The size of the kind of pages that mmap() uses, is found using
   
4. 
   
5. #include <unistd.h>
   
6. long sz = sysconf(_SC_PAGESIZE);
   
7. 
   
8. (where some systems also allow the synonym _SC_PAGE_SIZE for _SC_PAGESIZE), or
   
9. 
   
10. #include <unistd.h>
    
11. int sz = getpagesize()

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1. [root@localhost test]# more pagesize.c
   
2. #include <unistd.h>
   
3. #include <stdio.h>
   
4. int main(int argc, char *argv[])
   
5. {
   
6. printf("linux page size is %d bytes",getpagesize());
   
7. return 0;
   
8. }

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1. [root@localhost test]# gcc -g pagesize.c -o pagesize -Wall
   
2. [root@localhost test]# ./pagesize
   
3. linux page size is4096 bytes