[B! gc] dobocchoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

doboccho id:doboccho

gcã«é–¢ã™ã‚‹dobocchoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (4)

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

${{author_name}}$
{{author_name}}{{created}}
{{ #comment }}{{ comment }}{{ /comment }}
- {{ label }}

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

ç¬¬9å›žã€€ï¼»æœ€çµ‚å›žï¼½HotSpot JVMã®GCã‚’é¸æŠžã—ã‚ˆã† | gihyo.jp
HotSpot JVMã‚’ä½¿ã†ã¨ãã€ã©ã®ã‚ˆã†ã«GCã‚’è¨å®šã—ã¦ã„ã¾ã™ã‹ï¼Ÿ æ¤œç´¢ã—ã¦å‡ºã¦ããŸãƒ›ãƒ¼ãƒ ãƒšãƒ¼ã‚¸ã‚’è¦‹ã¦ ã€Œã¨ã‚Šã‚ãˆãšã“ã®ãƒ›ãƒ¼ãƒ ãƒšãƒ¼ã‚¸ã«ã‚ã‚‹ã‚ˆã†ã«æœ€æ–°ã®GCã‚’æŒ‡å®šã—ãŸã—ã€åŒã˜ã‚ˆã†ã«ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’è¨å®šã—ãŸã‹ã‚‰å¤§ä¸ˆå¤«ã ã‚ã€ ã¨æ€ã£ã¦ã—ã¾ã†è©±ã‚’ã‚ˆãè¦‹èžãã—ã¾ã™ã€‚ å›³1ã€€èª¤ã£ãŸGCã®é¸æŠž ã—ã‹ã—ã€ãŸã¨ãˆã°ãƒãƒƒãƒã®ã‚ˆã†ã«ã‚¹ãƒ«ãƒ¼ãƒ—ãƒƒãƒˆã‚’æ„è˜ã™ã¹ãå‡¦ç†ã«ã‚‚ã‹ã‹ã‚ã‚‰ãšã€ãƒ¬ã‚¹ãƒãƒ³ã‚¹ã‚¿ã‚¤ãƒ é‡è¦–ã®GCã‚’é¸ã‚“ã§ã—ã¾ã†ã®ã¯é©åˆ‡ã§ã¯ã‚ã‚Šã¾ã›ã‚“ã€‚ æœ€çµ‚å›žã¨ãªã‚‹ä»Šå›žã¯ã€HotSpotã«ã¯ã©ã®ã‚ˆã†ãªGCãŒã‚ã‚Šã€ã©ã®ã‚ˆã†ã«ãã‚Œã‚‰ã‚’é¸æŠžã™ã‚Œã°è‰¯ã„ã®ã‹ã‚’ç´¹ä»‹ã—ã¾ã™ã€‚ 4ã¤ã®GCã‚’ä½¿ã„ã“ãªã™ HotSpot JVMã«ã¯ã€ä»¥ä¸‹ã®4ã¤ã®GCãŒå®Ÿè£…ã•ã‚Œã¦ã„ã¾ã™ã€‚ ã‚·ãƒªã‚¢ãƒ«GC ãƒ‘ãƒ©ãƒ¬ãƒ«GC ã‚³ãƒ³ã‚«ãƒ¬ãƒ³ãƒˆ ãƒžãƒ¼ã‚¯ï¼†ã‚¹ã‚¤ãƒ¼ãƒ—GCï¼ˆCMSï¼‰ ã‚¬ãƒ™ãƒ¼ã‚¸ãƒ•ã‚¡ãƒ¼ã‚¹ãƒˆGCï¼ˆG1GCï¼‰ 1ã¤ãšã¤è¦‹ã¦ã„ãã¾ã—ã‚‡ã†ã€‚ ã‚·ãƒªã‚¢ãƒ«GC ã“ã®GCã®ç‰¹å¾´ã¯ã€ãƒ’ãƒ¼ãƒ—ã®
doboccho 2013/08/29
gc

Java
ãƒªãƒ³ã‚¯
Javaã‚¬ãƒ™ãƒ¼ã‚¸ã‚³ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³ã®ã‚¨ãƒƒã‚»ãƒ³ã‚¹
ã‚ã‚‹ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®ä½œæ¥ã«ã¨ã£ã¦ã€ã‚¹ãƒ«ãƒ¼ãƒ—ãƒƒãƒˆã¯æœ€ã‚‚é‡è¦ãªã‚¿ãƒ¼ã‚²ãƒƒãƒˆã§ã™ã€‚1ã¤ä¾‹ã‚’æŒ™ã’ã‚‹ã¨ã€é•·æ™‚é–“å®Ÿè¡Œã•ã‚Œã‚‹ãƒãƒƒãƒå‡¦ç†ã®ã‚¸ãƒ§ãƒ–ã§ã™ã€‚ã‚¬ãƒ™ãƒ¼ã‚¸ã‚³ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³ãŒå®Ÿè¡Œã•ã‚Œã¦ã„ã‚‹é–“ã€ãƒãƒƒãƒã‚¸ãƒ§ãƒ–ãŒæ™‚ã€…1ã€2ç§’æ¢ã¾ã£ã¦ã‚‚ã€ã‚¸ãƒ§ãƒ–å…¨ä½“ãŒã™ãã«å®Œäº†ã™ã‚Œã°å•é¡Œã‚ã‚Šã¾ã›ã‚“ã€‚ äººé–“ãŒç›´æŽ¥å¯¾è©±ã™ã‚‹ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‹ã‚‰é‡‘èžå–å¼•ã‚·ã‚¹ãƒ†ãƒ ã¾ã§ã€å®Ÿè³ªçš„ãªä»–ã®ã™ã¹ã¦ã®ä½œæ¥ã§ã¯ã€ã‚·ã‚¹ãƒ†ãƒ ãŒ1ã€2ç§’ã‹ã€æ•°ãƒŸãƒªç§’ä»¥ä¸Šåå¿œã—ãªã„å ´åˆã€å¤§å¤‰ãªã“ã¨ã«ãªã‚Šå¾—ã¾ã™ã€‚é‡‘èžå–å¼•ã§ã¯ã€ã—ã°ã—ã°ä¸€è²«ã—ãŸåœæ¢æ™‚é–“ã¨å¼•ãæ›ãˆã«ã€ã‚¹ãƒ«ãƒ¼ãƒ—ãƒƒãƒˆã‚’çŠ ç‰²ã«ã™ã‚‹ã ã‘ã®ä¾¡å€¤ã¯ã‚ã‚Šã¾ã™ã€‚ç‰©ç†çš„ã«åˆ©ç”¨å¯èƒ½ãªãƒ¡ãƒ¢ãƒªé‡ã«ã‚ˆã£ã¦åˆ¶é™ã•ã‚Œã‚‹ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚’æŒã£ãŸã‚Šã€footprintã‚’ç¶æŒã—ãªã‘ã‚Œã°ãªã‚‰ãªã‹ã£ãŸã‚Šã™ã‚‹ã“ã¨ã‚‚ã‚ã‚Šã¾ã™ã€‚ãã®ã‚ˆã†ãªå ´åˆã€åœæ¢æ™‚é–“ã¨ã‚¹ãƒ«ãƒ¼ãƒ—ãƒƒãƒˆã®é¢ã®ä¸¡æ–¹ã§ã€ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã‚’ã‚ãã‚‰ã‚ãªã‘ã‚Œã°ãªã‚Šã¾ã›ã‚“ã€‚ ä»¥ä¸‹ã®ãƒˆãƒ¬ãƒ¼ãƒ‰ã‚ªãƒ•ã¯åº¦ã€…èµ·ã“ã‚Šã¾ã™ã€‚ å¤§éƒ¨
doboccho 2013/08/06
gc

jvm

java

ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°
ãƒªãƒ³ã‚¯
Javaãƒ¡ãƒ¢ãƒªã€GCãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã¨ãã‚Œã«ã¾ã¤ã‚ã‚‹ãƒˆãƒ©ãƒ–ãƒ«å¯¾å¿œæ‰‹é †ã¾ã¨ã‚ - æ—¥è¨˜ã®ã‚ˆã†ãªä½•ã‹
GCå‘¨ã‚Šã§ãƒˆãƒ©ãƒ–ãƒ«ã‚·ãƒ¥ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã—ãŸéš›ã®çµŒé¨“ã‚„ã€Webç‰ã§èª¿ã¹ãŸã“ã¨ã‚’ã¾ã¨ã‚ã¦ã¿ã‚‹ã€‚ å‰æ ãƒ»JVMã¯ã€Sun Javaã‚’æƒ³å®šã€‚(ä»–ã¯ä½¿ã£ãŸã“ã¨ãªã„ã§ã™ã€‚ã€‚ã€‚) ãƒ»Sun Java 1.5-1.6ã‚’æƒ³å®šã€‚ ç›®æ¨™ ãƒžã‚¤ãƒŠãƒ¼GCã€Full GCãã‚Œãžã‚ŒãŒé »ç™ºã™ã‚‹ã“ã¨ãªãã€ã‹ã¤ãã‚Œãžã‚Œã®å®Ÿè¡Œæ™‚é–“ã‚’1ç§’æœªæº€ã«æŠ‘ãˆã‚‹ã“ã¨ã€‚ ãƒžã‚¤ãƒŠãƒ¼GCã¯1ç§’æœªæº€ã©ã“ã‚ã§ã¯ãªãã€ã‚‚ã£ã¨çŸããªã‚‹ã¹ãã€‚ã©ã‚Œãã‚‰ã„ãŒç†æƒ³ã‹ã¯ï¼Ÿ(0.1ç§’æœªæº€ãã‚‰ã„ã‚’ç›®æŒ‡ã—ãŸã„ï¼Ÿ) é€£ç¶šã—ãŸè² è·çŠ¶æ…‹(æƒ³å®šã•ã‚Œã‚‹ãƒ”ãƒ¼ã‚¯ã‚¢ã‚¯ã‚»ã‚¹)ã§ã‚‚OutOfMemoryErrorãŒç™ºç”Ÿã—ãªã„ã“ã¨ã€‚ ç†æƒ³çš„ãªçŠ¶æ…‹ã¯ã€ä¸Šè¨˜ã«åŠ ãˆã¦ã€Full GCã®ç™ºç”ŸãŒä½Žé »åº¦ã§ã‚ã‚‹ã“ã¨ã€‚ å…·ä½“çš„ã«ã¯ã€ã§ãã‚‹ã ã‘ãƒžã‚¤ãƒŠãƒ¼GCã§çŸå‘½ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆ(1å›žä½¿ã£ãŸã‚‰ã‚‚ã†ä½¿ã‚ãªã„ã‚ˆã†ãªã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã€‚é€†ã«ã‚»ãƒƒã‚·ãƒ§ãƒ³ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆç‰ã¯é•·å‘½ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã¨ãªã‚‹)ã‚’ç ´æ£„ã•ã›ã¦ã€çŸå‘½ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆãŒã€Tenu
doboccho 2012/05/08
gc

Java

ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°
ãƒªãƒ³ã‚¯
ã€Žå¾¹åº•è§£å‰–ã€ŒG1GCã€ ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ç·¨ã€ç™ºå£²ï¼ï¼ - I am Cruby!
g1gcGCLoverã®ã¿ãªã•ã‚“ã€ãŠå¾…ãŸã›ã—ã¾ã—ãŸã€‚ GCæœ¬ã®ã‚¹ãƒ”ãƒ³ã‚ªãƒ•ã¨ãªã‚‹æ–°è‘—ã€ã€Žå¾¹åº•è§£å‰–ã€ŒG1GCã€ ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ç·¨ã€ãŒç™ºå£²ä¸ã§ã™ï¼ é”äººå‡ºç‰ˆä¼šæ§˜ã®ä»¥ä¸‹ã®ãƒšãƒ¼ã‚¸ã‹ã‚‰ã”è³¼å…¥ä¸‹ã•ã„ã€‚ ãªã‚“ã¨600å††ã§ã™ï¼ï¼ï¼ã€€ã‚‚ã†ã™ãã«ã§ã‚‚ãƒãƒã£ã¡ã‚ƒã£ã¦ãã ã•ã„ï¼ï¼ï¼ï¼ï¼ å¾¹åº•è§£å‰–ã€ŒG1GCã€ ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ç·¨ - é”äººå‡ºç‰ˆä¼š ã©ã†ã„ã†å†…å®¹ãªã®ï¼Ÿã¾ãˆãŒãã‚’ã¿ã‚‹ã¨ã‚ˆãã‚ã‹ã‚Šã¾ã™ã€‚ ä»Šå›žã¯OpenJDK7ï¼ˆã„ã‚ã‚†ã‚‹Java7ï¼‰ã«æ–°ã—ãå®Ÿè£…ã•ã‚ŒãŸã€ŒG1GCï¼ˆGarbage First Garbage Collectionï¼‰ã€ã¨ã„ã†GCã®è¬Žã‚’è§£æ˜Žã—ã¦ã„ãã¾ã™ã€‚ G1GCã®å¤§ããªè¬Žã¨ã—ã¦ã€ŒGCåœæ¢æ™‚é–“ã‚’äºˆæ¸¬ã§ãã‚‹ã€ã¨ã„ã†ã®ãŒã‚ã‚Šã¾ã™ã€‚æœ¬æ›¸ ã§ã¯ãã®è¬Žã®å›žç”ã‚’ä½•åãƒšãƒ¼ã‚¸ã‚‚ã‹ã‘ã¦è§£èª¬ã—ã¦ã„ã¾ã™ã€‚ G1GCã«ã¤ã„ã¦æ›¸ã‹ã‚ŒãŸè³‡æ–™ã¨ã—ã¦ã€Detlefsã‚‰ã®è‹±èªžã®è«–æ–‡ï¼ˆDetlefs04ï¼‰ãŒã‚ ã‚Šã¾ã™ã€‚ ã¨ã“ã‚ãŒã€ã“ã‚Œã¯è¬Ž
doboccho 2011/06/28
Java

gc

é›»åæ›¸ç±
ãƒªãƒ³ã‚¯
1