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Javaã®HeapDumpBeforeFullGCã‚ªãƒ—ã‚·ãƒ§ãƒ³

Sunã®JVMã«ã¯HeapDumpBeforeFullGCã£ã¦ã„ã†ã‚ªãƒ—ã‚·ãƒ§ãƒ³ãŒã‚ã‚Šã¾ã™ã€‚çŸ¥ã£ã¦ã¾ã—ãŸï¼Ÿã“ã®ã‚ãƒ¼ãƒ¯ãƒ¼ãƒ‰ã§ããã£ã¦ã‚‚200ä»¶ç¨‹åº¦ã—ã‹ã²ã£ã‹ã‹ã‚‰ãªã„ã®ã§çŸ¥ã‚‰ãªã„äººã‚‚å¤šã„ã‚“ã˜ã‚ƒãªã„ã‹ã¨æ€ã„ã¾ã™ã€‚ ã‚ã¾ã‚ŠçŸ¥ã‚‰ã‚Œã¦ãªã•ãã†ãªã“ã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã€‚å®Ÿã¯ã™ã”ã„ã§ãã‚‹åã§ã™ã€‚ãªã‚“ã¨ã€åå‰ã®ã¨ãŠã‚ŠFullGCç›´å‰ã«ãƒ’ãƒ¼ãƒ—ãƒ€ãƒ³ãƒ—ã ã—ã¦ãã‚Œã¾ã™ã€‚ãŸã¨ãˆã°Youngé ˜åŸŸä½¿ã„ã™ãŽã§æ˜‡æ ¼ã—ã¦ã—ã¾ã†ã‚ˆã†ãªã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’æŽ¢ã™ã¨ãã«ã“ã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ä½¿ã†ã¨å¤§æ´»èºã—ã¦ãã‚Œã¾ã™ã€‚ ã“ã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¯æ™®é€šã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¨é•ã†ã®ã§ä¾‹ã«ã‚ˆã£ã¦-XX:+...ã§ä½¿ã„ã¾ã™ã€‚ã“ã‚“ãªæ„Ÿã˜ã§ã™ã€‚

dann 2011/04/26

java
jvm

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Inspecting HotSpot JVM Options

Introduction A method for inspecting the comprehensive set of HotSpot JVM options and some examples comparing different outputs. Background The Oracle JVM provides an enormous spectrum of options to control the runtime JVM. These options are given a criminally short and non-comprehensive discussion at the OTN here. OTN divides these options into three categories: Behavioural, Performance and Debug

dann 2011/04/26

-XX:+PrintFlagsFinal, -XX:+UnlockExperimentalVMOptions

ãƒªãƒ³ã‚¯

http://www.austinjug.org/presentations/JDK6PerfUpdate_Dec2009.pdf

dann 2011/04/26

jvm
java

ãƒªãƒ³ã‚¯

HotspotVMã®åœ§ç¸®oops

åŽŸæ–‡ ç¿»è¨³ï¼šä¸æ‘ æˆæ´‹ æ›´æ–° 2010/09/19 ã‚‹ã¨ã•ã‚“ã‹ã‚‰ã®ã”æŒ‡æ‘˜ã§èª¤è¨³ã‚’ä¿®æ£ æ›´æ–° 2010/09/18 nminoruã•ã‚“ã¨ã€Dominion525ã•ã‚“ã®ã”æŒ‡æ‘˜ã§èª¤è¨³ã‚’ä¿®æ£ oopã£ã¦ãªã«ï¼Ÿã€€ãªã‚“ã§åœ§ç¸®ã™ã‚‹å¿…è¦ãŒã‚ã‚‹ã®ï¼Ÿ Hotspotã®å°‚é–€ç”¨èªžã§ã‚ã‚‹ã€Œoopï¼ˆordinary object pointer:é€šå¸¸ã®ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆãƒã‚¤ãƒ³ã‚¿ï¼‰ã€ã¯ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã¸ã®ç®¡ç†ãƒã‚¤ãƒ³ã‚¿ã®ã“ã¨ã ã€‚ é€šå¸¸ã¯ãƒã‚¤ãƒ†ã‚£ãƒ–ãªãƒã‚¤ãƒ³ã‚¿ã‚µã‚¤ã‚ºã¨åŒã˜ã«ãªã‚‹ã€‚ã¤ã¾ã‚Šã€LP64ã®ç’°å¢ƒã§ã‚ã‚Œã°64ãƒ“ãƒƒãƒˆã«ãªã‚‹ã¨ã„ã†ã“ã¨ã ã€‚ ILP32ã®ç’°å¢ƒã§ã¯ã€æœ€å¤§ãƒ’ãƒ¼ãƒ—ã‚µã‚¤ã‚ºã¯4GBã‚ˆã‚Šå¹¾åˆ†ã‹å°‘ãªããªã‚‹ã€‚ã“ã‚Œã¯å¤šãã®ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã«ã¨ã£ã¦ä¸ååˆ†ã ã€‚ ã˜ã‚ƒã‚ã€LP64ã®ç’°å¢ƒã§ã¯ã¨ã„ã†ã¨ã€ã»ã¨ã‚“ã©ã®å ´åˆã®ãƒ’ãƒ¼ãƒ—ã¯ã€å¯¾å¿œã™ã‚‹IPL32ã®ç’°å¢ƒã¨æ¯”ã¹ã¦ç´„1.5å€ã«ãªã£ã¦ã—ã¾ã†ï¼ˆã©ã¡ã‚‰ã‚‚åŒã˜çŠ¶æ³ã¨ä»®å®šï¼‰ã€‚ ç®¡ç†ãƒã‚¤ãƒ³ã‚¿ã®ã‚µã‚¤ã‚ºãŒå¢—å¤§ã—ã¦ã—ã¾ã†

dann 2011/04/26

jvm
java

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HBaseã®æ§‹é€ - LunaBiblos

ã“ã®CAPå®šç†ã®è€ƒãˆæ–¹ã‹ã‚‰ã™ã‚‹ã¨ã€HBaseã¯ä¸€è²«æ€§/æ•´åˆæ€§ã¨ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯åˆ†æ–è€æ€§ã‚’é¸æŠžã—ãŸCPåž‹ã«åˆ†é¡žã•ã‚Œã‚‹ã€‚ ãƒ‡ãƒ¼ã‚¿æ§‹é€ HBaseã¯ä¸»ã«ä»¥ä¸‹ã«æŒ™ã’ã‚‹è¦ç´ ã‹ã‚‰æ§‹æˆã•ã‚Œã¦ã„ã‚‹ã€‚ã¾ãŸã“ã®æ§‹é€ ã¯HBaseã ã‘ã§ãªãKVSã‚„ã‚«ãƒ©ãƒ æŒ‡å‘åž‹DBã«ãŠã„ã¦è‰¯ãã¿ã‚‰ã‚Œã‚‹æ§‹é€ ã§ã‚ã‚‹ã€‚ Table Row ColumnFamily ï½¥ï½¥ï½¥ (Column) Column ï½¥ï½¥ï½¥ (Label) HBaseã¯åå‰ã®ã¤ã„ãŸTableãŒã‚ã‚Šã€ãã“ã«Rowã¨å‘¼ã°ã‚Œã‚‹RDBMSã®ã€Œãƒ¬ã‚³ãƒ¼ãƒ‰ã€ã«ç›¸å½“ã™ã‚‹å½¢å¼ã§ãƒ‡ãƒ¼ã‚¿ãŒä¿å˜ã•ã‚Œã¦ã„ã‚‹ã€‚ä¿å˜ã•ã‚Œã¦ã„ã‚‹å„ãƒ‡ãƒ¼ã‚¿ã«ã¯ã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ãŒä¼´ã£ã¦ãŠã‚Šã€ã“ã®ã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã‚’æŒ‡å®šã—ã¦ãƒ‡ãƒ¼ã‚¿ã‚’å–å¾—ã™ã‚‹äº‹ã‚‚å‡ºæ¥ã‚‹ã€‚ã‚‚ã—ã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã‚’æŒ‡å®šã›ãšã«ãƒ‡ãƒ¼ã‚¿å–å¾—ã‚’è¡Œã£ãŸå ´åˆã¯æœ€æ–°ã®å€¤ã®ã‚¿ã‚¤ãƒ ã‚¹ã‚¿ãƒ³ãƒ—ã‚’æŒã¤ãƒ‡ãƒ¼ã‚¿ãŒè¿”ã•ã‚Œã‚‹ã€‚ColumnFamilyå˜ä½ã§ã®å–å¾—ã®æ§˜ã«è¤‡æ•°ã®å€¤ã‚’å–å¾—ã™ã‚‹å ´åˆã§ã‚‚ã€ãã‚Œãžã‚Œ

dann 2011/04/26

hbase
java

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Apache HBase Do's and Don'ts - Cloudera Blog

I recently gave a talk at the LA Hadoop User Group about ApacheÂ HBase Doâ€™s and Donâ€™ts. The audience was excellent and had very informed and well articulated questions. Jody from Shopzilla was an excellent host and I owe him a big thanks for giving the opportunity to speak with over 60 LA Hadoopers. Since not everyone lives in LA or could make it to the meetup, Iâ€™ve summarized some of the salient p

dann 2011/04/26

hbase

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ìˆ˜ì›ì˜¤í”¼^ì œì´ì œì´^ | Meetup ìˆ˜ì›ì˜¤í”¼^ì œì´ì œì´^ | Meetup

Not a Meetup member yet? Log in and find groups that host online or in person events and meet people in your local community who share your interests.

dann 2011/04/26

hbase

ãƒªãƒ³ã‚¯

Cloudera Blog

Enterprises see embracing AI as a strategic imperative that will enable them to stay relevant in increasingly competitive markets. However, it rem ains difficult to quickly build these capabilities given the challenges with finding readily available talent and resources to get started rapidly on the AI journey. Cloudera recently signed a strategic collaboration agreement with Amazon [â€¦] Read blog p

dann 2011/04/26

hbase
jvm

ãƒªãƒ³ã‚¯

Chromeã‚’vimé¢¨ã®ã‚³ãƒžãƒ³ãƒ‰ã§å‹•ã‹ã™ä¾¿åˆ©ãªæ‹¡å¼µæ©Ÿèƒ½( chrome extension)ï¼švimium+gleebox | Brand Of Me

ã“ã‚“ã«ã¡ã¯ã˜ã‡ã„ã§ã™ã€‚æœ€è¿‘ã€ã—ã‹ã£ã‚Šã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã‚’ç›®æŒ‡ãã†ã€ã‚‚ã£ã¨åŠ¹çŽ‡ã‚ˆããƒ‘ã‚½ã‚³ãƒ³ã‚’ä½¿ã„ã“ãªã›ã‚‹ã‚ˆã†ã«ãªã‚ã†ï¼ã¨ã„ã†ã“ã¨ã§ã€ã§ãã‚‹ã ã‘ã‚ãƒ¼ãƒœãƒ¼ãƒ‰ã ã‘ã§æ“ä½œã™ã‚‹ã‚ˆã†ã«ã—ã¦ã„ã¾ã™ï¼ˆã¨ã„ã£ã¦ã‚‚ã¾ã ä¸æ…£ã‚Œãªã®ã§ã€ã‚ãƒ¼ãƒœãƒ¼ãƒ‰ã§æ“ä½œã™ã‚‹ã»ã†ãŒé…ã„æ³£ï¼‰ã€‚ã—ã‹ã—æ…£ã‚Œã‚‹ã¨é«˜é€Ÿã«æ–‡æ›¸ç·¨é›†ã‚„ã‚‰æ“ä½œãŒã§ãã‚‹ã¨èžãã®ã§é ‘å¼µã‚ã†ã¨æ€ã„ã¾ã™ã€‚ ã•ã¦ã€ä»Šæ—¥ç´¹ä»‹ã™ã‚‹ã®ã¯chromeã‚’vimé¢¨ã®ã‚³ãƒžãƒ³ãƒ‰ã§å‹•ã‹ã™ä¾¿åˆ©ãªæ‹¡å¼µæ©Ÿèƒ½(chrome extenxtion)ã‚’ç´¹ä»‹ã—ã‚ˆã†ã¨æ€ã„ã¾ã™ã€‚vimiumã¨ã„ã†ã‚„ã¤ã¨gleeboxã§ã™ã€‚vimiumãŒåå‰ã®é€šã‚Šã€vimé¢¨ã‚³ãƒžãƒ³ãƒ‰ã§å‹•ã‹ã™ã‚‚ã®ã€‚gleeboxã¯ãã®ä»–ã®æ¯ãŒã‚†ã„ã¨ã“ã‚ã«æ‰‹ã‚’ä¼¸ã°ã™ãŸã‚ã«å°Žå…¥ã—ãŸã‚‚ã®ã§ã™ã€‚ Vimã£ã¦ï¼Ÿ vimã®ç´¹ä»‹ Vimã¨ã¯ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ãŠé¦´æŸ“ã¿ã®ãƒ†ã‚ã‚¹ãƒˆã‚¨ãƒ‡ã‚£ã‚¿ã§ã™ã€‚ã“ã‚Œã‚’ä½¿ã£ã¦é«˜é€Ÿã«ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ãªã‚“ãžã‚’ã—ã¦ã„ã‚‹ã¨ã¡ã‚‡ã£ã¨ã‹ã£ã“ã„ã„ã—ã€ãƒžã‚¸ã§æ—©ã„ã‚‰ã—ã„ï¼ˆã¿

dann 2011/04/26

chrome

ãƒªãƒ³ã‚¯

The ROUTER and DEALER - zeromq

Thought: XREP is really a router that creates and consumes request-reply routing envelopes. It is the only socket type that lets you route messages to specific connections if you know their identities. If it was called ROUTER that could be more meaningful. XREQ is really a combined ventilator / sink that does load-balancing on output and fair-queuing on input with no other semantics. It is the onl

dann 2011/04/26

zeromq

ãƒªãƒ³ã‚¯

Oracle index blocksize tuning

Update: For the latest consensus on using multiple blocksizes in Oracle, see The latest consensus on multiple blocksizes. The benefits of a large blocksize The benefits of large blocksizes are demonstrated on this OTN thread where we see a demo showing 3x faster performance using a larger block size: SQL> r 1 select count(MYFIELD) from table_8K where ttime >to_date('27/09/2006','dd/mm/y 2* and tti

dann 2011/04/26

oracle
index

ãƒªãƒ³ã‚¯

Use a large database block size

Because the database block size is fixed at database creation, this is one decision that is important to get right the first time. For file system based datafiles, without direct I/O, the database block size must match the file system buffer size exactly, as explained here. However, if your database is raw, or if direct I/O is available, then you have the luxury of choosing a larger database block

dann 2011/04/26

oracle
index

ãƒªãƒ³ã‚¯

TracBrowserãŒSVNã®å·¨å¤§ãªChangesetã‚’å‡¦ç†ã—ãã‚Œãªã„å ´åˆã¸ã®ãƒ•ã‚§ã‚¤ãƒ«ã‚»ãƒ¼ãƒ• - å¤§é£Ÿé›‘è¨˜

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dann 2011/04/26

trac

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2011å¹´4æœˆ26æ—¥ã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (13ä»¶)

Javaã®HeapDumpBeforeFullGCã‚ªãƒ—ã‚·ãƒ§ãƒ³

Inspecting HotSpot JVM Options

http://www.austinjug.org/presentations/JDK6PerfUpdate_Dec2009.pdf

HotspotVMã®åœ§ç¸®oops

HBaseã®æ§‹é€ - LunaBiblos

Apache HBase Do's and Don'ts - Cloudera Blog

ìˆ˜ì›ì˜¤í”¼^ì œì´ì œì´^ | Meetup ìˆ˜ì›ì˜¤í”¼^ì œì´ì œì´^ | Meetup

Cloudera Blog

Chromeã‚’vimé¢¨ã®ã‚³ãƒžãƒ³ãƒ‰ã§å‹•ã‹ã™ä¾¿åˆ©ãªæ‹¡å¼µæ©Ÿèƒ½( chrome extension)ï¼švimium+gleebox | Brand Of Me

The ROUTER and DEALER - zeromq

Oracle index blocksize tuning

Use a large database block size

TracBrowserãŒSVNã®å·¨å¤§ãªChangesetã‚’å‡¦ç†ã—ãã‚Œãªã„å ´åˆã¸ã®ãƒ•ã‚§ã‚¤ãƒ«ã‚»ãƒ¼ãƒ• - å¤§é£Ÿé›‘è¨˜

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