[B! memory] hogemã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

hogem id:hogem

memoryã«é–¢ã™ã‚‹hogemã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (8)

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ã‚ã‚“ã¾ã‚Šã‚¨ãƒ³ãƒˆãƒªã«ã™ã‚‹ã»ã©ã®åˆ†é‡ã¯ãªã„ã‚“ã ã‘ã©ã€ç¾æ™‚ç‚¹ã§ã®ã‚ªã‚¤ãƒ©ã®ã‚ªã‚¹ã‚¹ãƒ¡å€¤ã‚’è²¼ã£ã¨ã overcommit_memory=2 overcommit_ratio=0 swapãƒ‘ãƒ¼ãƒ†ã‚£ã‚·ãƒ§ãƒ³ã®ã‚µã‚¤ã‚ºï¼šã€€ç‰©ç†ãƒ¡ãƒ¢ãƒªé‡ï½˜ï¼˜ï¼ï¼… overcommit_ratio=0 ã«ã™ã‚‹ã“ã¨ã§ã€å…¨ãƒ—ãƒã‚»ã‚¹ã®ä»®æƒ³ãƒ¡ãƒ¢ãƒªé‡ãŒã‚¹ãƒ¯ãƒƒãƒ—ã‚µã‚¤ã‚ºã‚’è¶…ãˆãªããªã‚‹ã®ã§ã€ã‚«ãƒ¼ãƒãƒ«ã«ã‚ˆã»ã©è² è·ã‚’ã‹ã‘ãªã„ã‹ãŽã‚Šã‚¹ãƒ¯ãƒƒãƒ—ã—ãªããªã‚‹ã€‚ ã‚“ã§ã€ã‚¹ãƒ¯ãƒƒãƒ—ã‚’ï¼ã«ã—ãŸã¨ãã¨é•ã£ã¦ã€ã‚«ãƒ¼ãƒãƒ«ã«è² è·ã‚’ã‹ã‘ã‚‹ã‚ˆã†ãªã‚¹ã‚²ãƒ¼ä½¿ã„ã‹ãŸã‚’ã—ãŸã¨ãã§ã‚‚ã‚¹ãƒ¯ãƒƒãƒ—ãŒç™ºç”Ÿã™ã‚‹ã ã‘ã§OOM-killerã¯ç™ºç”Ÿã—ãªã„ã€‚ æ¬ ç‚¹ã¯ã€ã»ã¼ä½¿ã‚ãªã„ã¨æƒ³å®šã—ã¦ã„ã‚‹ã‚¹ãƒ¯ãƒƒãƒ—ã«çµæ§‹ãªãƒ‡ã‚£ã‚¹ã‚¯é‡ã‚’ã¨ã‚‰ã‚Œã‚‹ã“ã¨ã ã‘ã§ã‚ã‚‹ã€‚ ã‚ã€ã‚ã¨ã€ï¼˜ï¼ï¼…ã¨ã„ã†ã®ã¯ã‹ãªã‚Šé©å½“ã«æ±ºã‚ãŸå€¤ãªã®ã§ã‚·ã‚¹ãƒ†ãƒ ã«ã‚ˆã£ã¦ã¯ï¼™ï¼ï¼…ã¨ã‹ã§ã‚‚ã„ã‘ã‚‹ã¨æ€ã†ã€‚ æ³¨æ„ï¼‘ï¼šã€€ã“ã®è¨å®šã¯çµ„ã¿è¾¼ã¿ã§ã¯å…¨ç„¶ä½¿ãˆã¾ã›ã‚“ã€‚ãªãœãªã‚‰ã‚µãƒ¼ãƒãƒ¼ç³»
hogem 2008/11/10
linux

kernel

memory
ãƒªãƒ³ã‚¯
DBã‚µãƒ¼ãƒå‘ã‘Linuxãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã‚’è€ƒãˆã‚‹ ã€œ ãƒ¡ãƒ¢ãƒªã‚ªãƒ¼ãƒãƒ¼ã‚³ãƒŸãƒƒãƒˆç·¨ : DSASé–‹ç™ºè€…ã®éƒ¨å±‹
Cã§ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’æ›¸ã„ã¦ã„ã¦å¤§é‡ã®ãƒ¡ãƒ¢ãƒªã‚’ç¢ºä¿ã—ãŸããªã£ãŸã¨ãã€å¤§æŠµã¯ mallocã‚’ä½¿ã†ã¨æ€ã„ã¾ã™ãŒã€ãã®éš›ã«ã¯æˆ»ã‚Šå€¤ãŒNULLã‹ã©ã†ã‹ã‚’åˆ¤æ–ã—ã¦ã‚¨ãƒ©ãƒ¼å‡¦ç†ã«é£›ã°ã™ã¨æ€ã„ã¾ã™ã€‚ã—ã‹ã—ã€Linux ã®ãƒ¡ãƒ¢ãƒªç®¡ç†ã‚µãƒ–ã‚·ã‚¹ãƒ†ãƒ ã«ã¯ã€Œãƒ¡ãƒ¢ãƒªãƒ»ã‚ªãƒ¼ãƒãƒ¼ã‚³ãƒŸãƒƒãƒˆã€ã¨ã„ã†æ©Ÿæ§‹ãŒã‚ã‚Šã€å®Ÿè£…ã•ã‚Œã¦ã„ã‚‹ãƒ¡ãƒ¢ãƒªä»¥ä¸Šã®é ˜åŸŸã‚’ç¢ºä¿ã§ãã¦ã—ã¾ã„ã¾ã™ã€‚ #include <stdio.h> #include <stdlib.h> int main() { int i; char *p; for(i=0;i<65536;i++){ p = (char *)malloc(65536); if(0 == (long)p){ break; } } printf("SIZE=%dMB\n",i*65536/1024/1024); return(0); } swapoff ã—ãŸãƒ¡ãƒ¢ãƒª 1G ã®ãƒžã‚·ãƒ³ã§ã“ã‚Œã‚’å®Ÿè¡Œã™ã‚‹ã¨ã“ã‚“ãªæ„Ÿã˜ã«ãª
hogem 2008/11/10
OSã«è½ã¨ã•ã‚Œã‚‹ãã‚‰ã„ãªã‚‰ã€DBè‡ªèº«ãŒãƒ¡ãƒ¢ãƒªä¸è¶³ã®ã‚¨ãƒ©ãƒ¼ã§è½ã¡ãŸã»ã†ãŒãƒžã‚·ã£ã¦ã„ã† / /proc/sys/vm/overcommit_* / man mallocè¦‹ãŸã‚‰ã€ã“ã®å‹•ä½œã¯ãƒã‚°ã‚‰ã—ã„

linux

kernel

memory
ãƒªãƒ³ã‚¯
ã€ç‰¹åˆ¥ãƒ¬ãƒãƒ¼ãƒˆã€‘32bit Windowsã®ç®¡ç†å¤–é ˜åŸŸã‚’RAM Diskã«ä½¿ã†
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hogem 2008/05/13
32bit windowsãŒãƒ¡ãƒ¢ãƒª3.5GBä»¥ä¸Šèªè˜ã§ããªã„é ˜åŸŸã‚’ã€RAMãƒ‡ã‚£ã‚¹ã‚¯ã¨ã—ã¦ä½¿ç”¨ã™ã‚‹ã€‚ãƒ¡ãƒ¢ãƒªãªã®ã§éžå¸¸ã«é«˜é€Ÿã€‚tmpãƒ•ã‚©ãƒ«ãƒ€ã¨ã—ã¦ã¯æœ€é©ã€‚

windows

memory

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Linux ã®ãƒ—ãƒã‚»ã‚¹ãŒ Copy on Write ã§å…±æœ‰ã—ã¦ã„ã‚‹ãƒ¡ãƒ¢ãƒªã®ã‚µã‚¤ã‚ºã‚’èª¿ã¹ã‚‹
Linux ã¯ fork ã§åãƒ—ãƒã‚»ã‚¹ã‚’ä½œæˆã—ãŸå ´åˆã€è¦ªã®ä»®æƒ³ãƒ¡ãƒ¢ãƒªç©ºé–“ã®å†…å®¹ã‚’åã¸ã‚³ãƒ”ãƒ¼ã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ã—ã‹ã—ã¾ã¨ã‚‚ã«å…¨ç©ºé–“ã‚’ã‚³ãƒ”ãƒ¼ã—ã¦ã„ãŸã®ã§ã¯ fork ã®ã‚³ã‚¹ãƒˆãŒé«˜ããªã£ã¦ã—ã¾ã„ã¾ã™ã—ã€åãŒè¦ªã¨åŒã˜ã‚ˆã†ãªãƒ—ãƒã‚»ã‚¹ã¨ã—ã¦å‹•ä½œã—ç¶šã‘ã‚‹å ´åˆã¯ã€å†…å®¹ã®é‡è¤‡ã—ãŸãƒšãƒ¼ã‚¸ãŒå¤šæ•°ã§ãã¦ã—ã¾ã„ã€åŠ¹çŽ‡ãŒã‚ˆãã‚ã‚Šã¾ã›ã‚“ã€‚ ãã“ã§ã€Linux ã®ä»®æƒ³ãƒ¡ãƒ¢ãƒªã¯ã€ãƒ¡ãƒ¢ãƒªç©ºé–“ã‚’èˆã‚ã¦ã‚³ãƒ”ãƒ¼ã™ã‚‹ã®ã§ã¯ãªãã€ã¯ã˜ã‚ã¯è¦ªåã§ãƒ¡ãƒ¢ãƒªé ˜åŸŸã‚’å…±æœ‰ã—ã¦ãŠã„ã¦ã€æ›¸ãè¾¼ã¿ãŒã‚ã£ãŸæ™‚ç‚¹ã§ã€ãã®æ›¸ãè¾¼ã¿ã®ã‚ã£ãŸãƒšãƒ¼ã‚¸ã ã‘ã‚’è¦ªåã§å€‹åˆ¥ã«æŒã¤ã¨ã„ã†ä»•çµ„ã¿ã§ã“ã®å•é¡Œã‚’å›žé¿ã—ã¾ã™ã€‚Copy-On-Write (CoW) ã¨å‘¼ã°ã‚Œã‚‹æˆ¦ç•¥ã§ã™ã€‚å…±æœ‰ãƒ¡ãƒ¢ãƒªãƒšãƒ¼ã‚¸ã¯ã€è¦ªåãã‚Œãžã‚Œã®ä»®æƒ³ãƒ¡ãƒ¢ãƒªç©ºé–“ã‚’åŒä¸€ã®ç‰©ç†ãƒ¡ãƒ¢ãƒªã«ãƒžãƒƒãƒ”ãƒ³ã‚°ã™ã‚‹ã“ã¨ã§å®Ÿç¾ã•ã‚Œã¾ã™ã€‚ã‚ˆã‚Šè©³ã—ãã¯ ã‚³ãƒ”ãƒ¼ã‚ªãƒ³ãƒ©ã‚¤ãƒˆ - Wikipedia ãªã©ã‚’å‚ç…§ã—ã¦ãã ã•ã„ã€‚ ã“ã® CoW ã«
hogem 2008/02/13
/proc/PID/smaps

linux

kernel

memory

process
ãƒªãƒ³ã‚¯
JF: Linux Kernel 2.6 Documentation: vm.txt
JF: Linux Kernel 2.6 Documentation: /usr/src/linux/Documentation/sysctl/vm.txt sysctl/vm.txt /proc/sys/vm/* ã«é–¢ã™ã‚‹æ–‡æ›¸ [ãƒ—ãƒ¬ã‚¤ãƒ³ãƒ†ã‚ã‚¹ãƒˆç‰ˆ] åŽŸè‘—ä½œè€…: Rik van Riel <riel@nl.linux.org> ç¿»è¨³è€…: å·å´Ž è²´å½¦ <takahiko(a)hakubi.co.jp> ãƒãƒ¼ã‚¸ãƒ§ãƒ³: 2.6.7 ç¿»è¨³æ—¥æ™‚: 2004/07/29 /proc/sys/vm/* ã«é–¢ã™ã‚‹æ–‡æ›¸ ã‚«ãƒ¼ãƒãƒ«ãƒãƒ¼ã‚¸ãƒ§ãƒ³ 2.2.10 (c) 1998, 1999, Rik van Riel <riel@nl.linux.org> ä¸€èˆ¬çš„ãªæƒ…å ±ã¨æ³•çš„å®£è¨€ã«ã¤ã„ã¦ã¯ã€README ã‚’è¦‹ã¦ãã ã•ã„ã€‚ ============================================
hogem 2007/12/19
ãƒ¡ãƒ¢ãƒªã‚ªãƒ¼ãƒãƒ¼ã‚³ãƒŸãƒƒãƒˆæ©Ÿèƒ½ã«ã¤ã„ã¦

linux

kernel

memory
ãƒªãƒ³ã‚¯
ã‚ãªãŸãƒ›ãƒ³ãƒˆã«64ãƒ“ãƒƒãƒˆã‚’èª¬æ˜Žã§ãã¾ã™ã‹ï¼Ÿ
ãªãœä»Š64ãƒ“ãƒƒãƒˆãªã®ã‹ ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿ã®ä¸–ä»£ãŒé€²ã‚€ã”ã¨ã«ã€ãƒ“ãƒƒãƒˆæ•°ã¯å¢—ãˆã¦ãã¾ã—ãŸã€‚ã§ã¯ãªãœã€ã“ã®ã‚ˆã†ã«ãƒ“ãƒƒãƒˆæ•°ãŒå¢—ãˆã¦ããŸã®ã§ã—ã‚‡ã†ã‹ã€‚ãã‚Œã¯ã€æŠ€è¡“ã®ç™ºé”ã¨ã¨ã‚‚ã«å‡¦ç†ã•ã‚Œã‚‹ã¹ããƒ‡ãƒ¼ã‚¿é‡ãŒå¢—ãˆã€ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿ã«å®Ÿè£…ã•ã‚Œã‚‹ãƒ¡ãƒ¢ãƒªãŒä¸Šé™ã«é”ã—ã¦ã—ã¾ã£ãŸã“ã¨ãŒã‚‚ã£ã¨ã‚‚å¤§ããªè¦å› ã¨ã„ãˆã‚‹ã§ã—ã‚‡ã†ã€‚ äº‹å®Ÿã€ã“ã“æ•°å¹´ã§ãƒ¡ãƒ¢ãƒªã¯32ãƒ“ãƒƒãƒˆã®é™ç•Œç¯„å›²ã§ã‚ã‚‹4Gãƒã‚¤ãƒˆï¼ˆ232ãƒã‚¤ãƒˆï¼‰ã«é”ã—ã¦ã—ã¾ã„ã¤ã¤ã‚ã‚Šã¾ã™ã€‚ä¸€èˆ¬çš„ãª32ãƒ“ãƒƒãƒˆã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿ã§ã¯ã€4Gãƒã‚¤ãƒˆä»¥ä¸Šã®ãƒ¡ãƒ¢ãƒªã‚’ç›´æŽ¥ï¼ˆç‰©ç†çš„ã«ï¼‰ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹ã“ã¨ã¯ã§ãã¾ã›ã‚“ã€‚ã—ã‹ã—ã€ãƒã‚¤ã‚¨ãƒ³ãƒ‰ã®x86ãƒžãƒ«ãƒãƒ—ãƒã‚»ãƒƒã‚µã‚·ã‚¹ãƒ†ãƒ ã§ã¯ã€ã™ã§ã«ã“ã®4Gãƒã‚¤ãƒˆã®å¹…ã‚’è¶…ãˆã¦ã—ã¾ã£ã¦ã„ã¾ã™ã€‚ ç¾åœ¨ã€ã‚¤ãƒ³ãƒ†ãƒ«ã®ã‚µãƒ¼ãƒå‘ã‘XEONãƒ—ãƒã‚»ãƒƒã‚µï¼ˆNoconaãŠã‚ˆã³ä¸€éƒ¨ã®Prescottã‚³ã‚¢ï¼‰ã§ã¯ã€ŒIntel Extended Server Memoryã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã€ã¨å‘¼ã°ã‚Œã‚‹æ‹¡å¼µæ©Ÿèƒ½ã«ã‚ˆã£ã¦
hogem 2007/09/29
Intelã¨AMDã®ãƒ—ãƒã‚»ãƒƒã‚µã¨ã€æ‰±ãˆã‚‹ç‰©ç†ã‚¢ãƒ‰ãƒ¬ã‚¹ã«ã¤ã„ã¦

pc

memory
ãƒªãƒ³ã‚¯
Linux ã®ãƒ¡ãƒ¢ãƒªãƒ¼ç®¡ç†(ãƒ¡ãƒ¢ãƒªâ€•ãŒè¶³ã‚Šãªã„ï¼Ÿ,ãƒ¡ãƒ¢ãƒªãƒ¼ãƒªãƒ¼ã‚¯ã®æ¤œå‡º-é˜²æ¢)(Kodama's tips page)
ã‚µâˆ’ãƒç‰ã«ä½¿ã£ã¦ã„ã‚‹PC ã®ãƒ¡ãƒ¢ãƒªãŒååˆ†ã‹ã©ã†ã‹æ°—ã«ãªã‚‹äº‹ã¯å¤šã„ã¨æ€ã†. èª¿ã¹å‡ºã™ã¨ ãƒ•ãƒªãƒ¼ãƒ¡ãƒ¢ãƒªãƒ¼ã®ä¸è¶³ã‚„ SWAP ã«ãƒ¡ãƒ¢ãƒªãƒ¼ãŒã¯ã¿ã ã—ã¦ã„ã‚‹æ§˜åãªã© å¿ƒé…ãªäº‹ãŒã„ã‚ã„ã‚ã§ã¦æ¥ã‚‹. PC ã®å‹•ä½œãŒé…ããªã‚‹åŽŸå› ã¯æ§˜ã€…ãªè¦å› ãŒçµ¡ã¿åˆã£ã¦ã„ã‚‹ã®ã§, è¡¨é¢ã«ç¾ã‚ŒãŸç—‡çŠ¶ã ã‘ã§ã¯åŠ¹æžœçš„ãªå¯¾ç–ãŒåˆ†ã‹ã‚‰ãªã„äº‹ã‚‚ã‚ã‚‹. ä»¥ä¸‹ã§ã¯, ãƒ¡ãƒ¢ãƒªâˆ’é–¢é€£ã«ã—ã¼ã£ã¦è§£èª¬ã™ã‚‹. ãƒ¡ãƒ¢ãƒªã®çŠ¶æ³ã‚’èª¿ã¹ã‚‹ ãƒ¡ãƒ¢ãƒªâˆ’ã¯ååˆ†ãªã¯ãšãªã®ã« ä½™è£•ãŒç„¡ã„ï¼Ÿ ã©ã®ãƒ—ãƒã‚»ã‚¹ãŒãƒ¡ãƒ¢ãƒªã‚’æ¶ˆè²»ã—ã¦ã„ã‚‹ã®ã‹ï¼Ÿ ãƒ¡ãƒ¢ãƒªãƒ¼ã®ãƒªãƒ¼ã‚¯ã‚’æ¤œå‡ºã™ã‚‹æ–¹æ³•ï¼Ÿ é˜²æ¢ã™ã‚‹æ–¹æ³•ï¼Ÿ ãƒ¡ãƒ¢ãƒªâˆ’ã¯ååˆ†ãªã¯ãšãªã®ã« SWAP ã‚’ä½¿ã£ã¦ã‚‹ï¼Ÿ ã˜ã‚ƒ, æœ¬å½“ã®ãƒ¡ãƒ¢ãƒªâˆ’ä¸è¶³ã¯ã©ã†ã—ãŸã‚‰åˆ†ã‹ã‚‹ã®ï¼Ÿ ãƒ¡ãƒ¢ãƒªãƒ¼ã¨ SWAP é ˜åŸŸã¯ã©ã®ãã‚‰ã„ç¢ºä¿ã™ã‚‹ã¨è‰¯ã„ã®ã‹ ãƒ¡ãƒ¢ãƒªã®çŠ¶æ³ã‚’èª¿ã¹ã‚‹ ãƒ¡ãƒ¢ãƒªã®åˆ©ç”¨çŠ¶æ³ã‚’èª¿ã¹ã‚‹æ–¹æ³•ã¯, free, top, ps, vmstat, /proc/meminfo
hogem 2006/12/21
freeã§ã®ç¢ºèªæ–¹æ³•

memory

linux

tips
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hogem 2006/04/15
firefox

memory

thunderbird
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