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1.1 Éó²éÄÚ´æÐÅÏ¢

ÔÚLinuxϵͳÖУ¬¿ÉÒÔͨ¹ýÏÂÁî”free”À´Éó²éϵͳµÄÄÚ´æÐÅÏ¢£¬°üÀ¨×ÜÄÚ´æ¡¢ÒÑÓÃÄÚ´æ¡¢¿ÉÓÃÄÚ´æ¡¢»º´æºÍ½»Á÷·ÖÇø¡£Ê¾Àý´úÂëÈçÏ£º

$ free -h

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              total        used        free      shared  buff/cache   available
Mem:           7.7G        1.9G        706M        512M        5.1G        5.1G
Swap:          2.0G        0B          2.0G

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1.2 ÕûÀí»º´æ

ÓÐʱ¼äϵͳ»á½«Ò»Ð©Êý¾Ý»º´æµ½ÄÚ´æÖУ¬ÒÔ¼ÓËÙ»á¼ûËÙÂÊ¡£¿ÉÊÇÈôÊÇÄÚ´æÖ÷Òª£¬¿ÉÒÔͨ¹ýÊÍ·Å»º´æÀ´ÌÚ×ÅÃû¹óµÄÄÚ´æ¿Õ¼ä¡£Ê¾Àý´úÂëÈçÏ£º

$ sync; echo 1 > /proc/sys/vm/drop_caches

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1.3 ÊͷŲ»ÐëÒªµÄÄÚ´æ

ÓÐʱ¼äÀú³Ì»áÕ¼Óôó×ÚµÄÄڴ棬µ«ÏÖʵÉÏËü²¢Ã»ÓÐʹÓÃÕâЩÄÚ´æ¡£Õâʱ£¬¿ÉÒÔͨ¹ý”malloc_trim”º¯ÊýÀ´ÊͷŲ»ÐëÒªµÄÄڴ档ʾÀý´úÂëÈçÏ£º

#include <malloc.h>

...

void trim_memory() {
    malloc_trim(0);
}

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2.1 ʹÓôóÒ³ÄÚ´æ

ÔÚһЩÐèÒª´óÄÚ´æÒ»Á¬¿Õ¼äµÄÓ¦ÓÃÖУ¬Ê¹ÓôóÒ³ÄÚ´æ¿ÉÒÔÌá¸ßÐÔÄÜ£¬ïÔÌ­ÄÚ´æËéƬ¡ £¿ÉÒÔͨ¹ýÒÔÏ°취ÆôÓôóÒ³Äڴ档ʾÀý´úÂëÈçÏ£º

$ echo "vm.nr_hugepages=128" >> /etc/sysctl.conf
$ sysctl -p

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2.2 ͸Ã÷´óÒ³

͸Ã÷´óÒ³ÊÇÒ»ÏîÄÚºËÌØÕ÷£¬¿ÉÒÔ×Ô¶¯½«Ð¡Ò³ÄÚ´æת»»Îª´óÒ³Äڴ棬ÒÔïÔÌ­Äڴ濪Ïú¡ £¿ÉÒÔͨ¹ýÒÔÏ°취ÆôÓÃ͸Ã÷´óÒ³¡£Ê¾Àý´úÂëÈçÏ£º

$ echo "always" > /sys/kernel/mm/transparent_hugepage/enabled

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2.3 ÄÚ´æ½ÓÄÉÕ½ÂÔ

LinuxϵͳÖÐÓжàÖÖÄÚ´æ½ÓÄÉÕ½ÂԿɹ©Ñ¡Ôñ£¬¿ÉÒÔƾ֤ÏêϸÐèÇó¾ÙÐе÷½â¡£³£¼ûµÄÄÚ´æ½ÓÄÉÕ½ÂÔÓДLru”¡¢”Generally FIFO”ºÍ”Buddy”¡£Ê¾Àý´úÂëÈçÏ£º

$ echo "lru" > /sys/kernel/mm/allocstool/lru
$ echo "generallyfifo" > /sys/kernel/mm/allocstool/lru
$ echo "buddy" > /sys/kernel/mm/allocstool/lru

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