sltrace.dvi
2002 advanced seminar Intelligent Systems Design Lab. 1 strace/ltrace 2003 3 31 : strace/ltrace strace ltrace 1 1.1 OS API1 time() 1 printf() C printf() 1.2 OS SIGINT Ctrl-C � � $ man 7 signal � � kill 1.3 C printf() scanf() 2 UNIX Windows 1.4 2 strace 2.1 strace � � $ strace � � Fig. 1 “Hello, world!†strace strace Fig. 2 “Hello, world†3 C printf() “Hello, world!†write() 1Application Programmin
Strace Analyzer - Next Generation - Cluster Buffer
Strace Analyzer - Next Generation This is the next generation of strace analyzer that uses the elapsed time capability of the strace function. This is more precise than the previous version. There are some other changes to make things a bit easier for managing data and for future upgrades. Link to versions and source How to create an strace fileCreating the strace file that is appropriate for the
Debugging Ruby Systems: Understanding and Troubleshooting the VM and your Application on Vimeo
The webinar will covers how to use powerful tools to see how your code is executed, so you can understand, debug and optimize it. Each tool will be presented with a variety of real-world examples of how it was used to solve problems in a popular library or application. The talk will covers techniques that can be used to troubleshoot production ruby deployments from three perspectives: The operati
Humberto Diógenes: hum blog » Blog Archive » strace on Mac OS X Leopard
self.blog(subject=random.choice(['mac', 'python', 'everything else'])) One of the most important tools for sysadmins and programmers working in the Linux/BSD environment is called strace. As it took me some time to find out where is “strace for Macâ€, I thought it would be worth documenting here… Making a long story short: in Tiger it was called ktrace, in Leopard it’s called dtrace, but it’s simpl
ltrace ã§å…±æœ‰ãƒ©ã‚¤ãƒ–ラリã®é–¢æ•°å‘¼ã³å‡ºã—をトレースã™ã‚‹ - bkブãƒã‚°
ltrace ã§å…±æœ‰ãƒ©ã‚¤ãƒ–ラリã®é–¢æ•°å‘¼ã³å‡ºã—をトレースã™ã‚‹ ltrace ã¯å…±æœ‰ãƒ©ã‚¤ãƒ–ラリã®é–¢æ•°å‘¼ã³å‡ºã—をトレースã™ã‚‹ Linux 用ã®ãƒ„ールã§ã™ã€‚システムコールをトレースã™ã‚‹strace ã¨åŒæ§˜ã«ã€ãƒ‡ãƒãƒƒã‚°ã«å¤§å¤‰å½¹ç«‹ã¡ã¾ã™ã€‚ ltrace 㯠Debian GNU/Linux ã®å ´åˆã¯ sudo apt-get install ltrace ã§ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã§ãã¾ã™ã€‚ ltrace ã®ä½¿ã„æ–¹ã¯ç°¡å˜ã§ã™ã€‚基本的ã«ã¯ ltrace コマンドã®å¼•æ•°ã«ãƒˆãƒ¬ãƒ¼ã‚¹ã—ãŸã„コマンドã¨ãã®å¼•æ•°ã‚’並ã¹ã‚Œã° OK ã§ã™ã€‚デフォルトã§ã¯ ltrace ã®ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã¯æ¨™æº–エラーã«å‡ºåŠ›ã•ã‚Œã¾ã™ã€‚ã“れをファイルã«å‡ºåŠ›ã•ã›ã‚‹ã«ã¯ -o オプションを用ã„ã¾ã™ã€‚ãŸã¨ãˆã°ã€æ¬¡ã®ã‚ˆã†ã«å®Ÿè¡Œã—ã¾ã™ã€‚ % ltrace -o log.txt wget https://www.codeblog.org/ ã“ã®ä¾‹ã§ã¯ wget ㌠ht
eyeball's memo: Windows 用 strace
blogをメモ紙代ã‚ã‚Šã«ä½¿ã†ãƒ†ã‚¹ãƒˆã§ã™ã€‚ 基本的ã«ã¯ã€é–“é•ã£ãŸã“ã¨ã¨ã€å˜˜ã—ã‹æ›¸ãã¾ã›ã‚“。 ä¿¡ã˜ã¦ãƒã‚«ã‚’見ãªã„よã†ã«ã€‚ アプリケーションã®å‹•ä½œã‚’ãƒã‚§ãƒƒã‚¯ã™ã‚‹ã®ã« unixç³» ã® OS ã§ã¯ truss ã§å‘¼ã³å‡ºã—ã¦ã„るシステムコールを表示ã§ãる。 標準的㪠unixç³»OS 㯠truss HP-UX 㯠tusc Linux 㯠strace åŒæ§˜ã®ã“ã¨ã‚’ Windows ã§å®Ÿæ–½ã—ãŸã„å ´åˆã«ã€ä»Šã¾ã§ã¯ã€ API Monitorを使用ã—ã¦ã„ãŸã‘ã©ã€StraceNTã¨ã„ã†ã®ãŒã‚るらã—ã„。 StraceNT ã¯ã€ThreadIDãŒè¡¨ç¤ºã•ã‚Œã‚‹ã®ã§ã‹ãªã‚Šã„ã„æ„Ÿã˜ã€‚
プãƒãƒ•ã‚¡ã‚¤ãƒ©ã®ã—ãã¿ steps to phantasien t(2007-08-23)
UNIX åå‘文書 artu ã®ä¸ã§ "Measure Before Optimizing" ã¨èª¬ã Raymond ã¯, åŒæ™‚ã«ãƒ—ãƒãƒ•ã‚¡ã‚¤ãƒ©ã®è¨ˆæ¸¬æ©Ÿæ§‹ (instrumentation) ãŒã‚‚ãŸã‚‰ã™ãƒŽã‚¤ã‚ºã«ã¤ã„ã¦æ³¨æ„を促ã—ã¦ã„ã‚‹. ç§ã®ãƒ—ãƒãƒ•ã‚¡ã‚¤ãƒ©ä¿¡ä»°ã«ä¸å®‰ãŒç¿³ã‚’è½ã¨ã™. gprof ノイズã¯ã•ã¦ãŠã, ãã‚‚ãもプãƒãƒ•ã‚¡ã‚¤ãƒ©ã¯ã©ã‚“ãªä»•çµ„ã¿ã§é€Ÿåº¦ã‚’測ã£ã¦ã„ã‚‹ã‚“ã ã‚ã†. gprof ã®ãƒžãƒ‹ãƒ¥ã‚¢ãƒ« ã«ã‚ˆã‚‹ã¨, GNU 一æ—ã®ãƒ—ãƒãƒ•ã‚¡ã‚¤ãƒ©ã¯æ¬¡ã®ã‚ˆã†ã«å®Ÿè£…ã•ã‚Œã¦ã„ã‚‹: ã¾ãš "-pg" オプションã¤ãã® gcc ã§ã‚½ãƒ¼ã‚¹ã‚’コンパイルã™ã‚‹. ã“ã®æŒ‡ç¤ºã‚’å—ã‘ãŸã‚³ãƒ³ãƒ‘イラã¯å„関数ã®å†’é ã« "mcount" ã¨ã„ã†åå‰ã®é–¢æ•°å‘¼å‡ºã—ã‚’åŠ ãˆã‚‹. リンクã™ã‚‹ C ã®ãƒ©ãƒ³ã‚¿ã‚¤ãƒ も専用ãƒãƒ¼ã‚¸ãƒ§ãƒ³ (gcrt0.o) ã«å·®ã—替ã‚ã‚‹. ã“ã®ãƒ©ãƒ³ã‚¿ã‚¤ãƒ ã¯è£ã§ profil() 関数を使ã„タイマを仕掛ã‘ã‚‹. ãã®ã‚¿ã‚¤ãƒžã¯ç™º
アジアã®ãƒšãƒ³ã‚®ãƒ³: Debug Hacks 番外編 -ソースコードをèªã‚€å‰ã« strace ã®ãƒã‚°ã‚’èªã‚‚ã†-
リファレンス: Debug Hacks Conference 2009 Debug Hacks Conference 2009開催ã—㟠Asianux Server3 ã« ZABBIX 1.6.4 をインストールã™ã‚‹ 「Hack#43 strace を使ã£ã¦ã€ä¸å…·åˆåŽŸå› ã®æ‰‹ãŒã‹ã‚Šã‚’見ã¤ã‘ã‚‹ã€ã‚’ kyamato ã•ã‚“ãŒç´¹ä»‹ã•ã‚Œã¦ã„ã¾ã™ã€‚strace ã¯ãƒ‡ãƒãƒƒã‚°ã ã‘ã§ãªãã€ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’èªã‚€å‰ã®ã€ã‚¢ã‚¿ãƒªã‚’付ã‘ã‚‹ã¨ãã«ã‚‚有効ã ã¨æ€ã„ã¾ã™ã€‚å°šã€ã“ã®æ–¹æ³•ã¯ sochoi ã•ã‚“ã‹ã‚‰æ•™ã‚ã£ãŸæ–¹æ³•ã§ã™ã€‚sochoi ã•ã‚“ã¯ã€ä»¥å‰ã€20万行㮠strace ãƒã‚°ã‹ã‚‰ã€ãƒã‚°ã®è¦å› ã¨ãªã‚‹50行をçŸæ™‚é–“ã§è¦‹å‡ºã—㟠strace ã®ã‚¹ãƒšã‚·ãƒ£ãƒªã‚¹ãƒˆã§ã™ã€‚何故ã€Debug Hacks ã« hack を書ã‹ãªã‹ã£ãŸã®ã‹ãŒç§ã¯ä¸æ€è°ãªãらã„ã§ã™(^ ^;; ã•ã¦ã€å…ˆæ—¥ã€zabbix-agent ãŒè¨å®šã•ã‚ŒãŸãƒ¦ãƒ¼ã‚¶ãƒ‘
Analyzing Asynchronous I/O Support with Oracle10g
Analyzing Asynchronous I/O Support with Oracle10g Published December 6, 2006 I/O Topics , oracle , Oracle Asynchronous I/O , Oracle DBWR , Oracle I/O Performance 6 Comments This is not a post about why someone would want to deploy Oracle with a mix of files with varying support for asynchronous I/O. It is just a peek at how Oracle10g handles it. This blog post is a continuation of yesterday’s topi
Analyzing Oracle10g Database Writer I/O Activity on Linux
Analyzing Oracle10g Database Writer I/O Activity on Linux Published December 5, 2006 DBWR Performance , oracle , Oracle Asynchronous I/O , Oracle DBWR 2 Comments Using strace(1) to Study Database Writer on Linux This is a short blog entry for folks that are interested in Oracle10g’s usage of libaio asynchronous I/O routines (e.g., io_submit(2)/io_getevents(2)). For this test, I set up Oracle10g re
top ã¯ãªãœ vmstat ã‚ˆã‚Šè² è·ãŒé«˜ã„ã®ã‹ - ablog
top 㯠vmstat ã«æ¯”ã¹ã¦è² è·ãŒã‹ã‹ã‚‹ã¨è¨€ã„ã¾ã™ãŒã€å…·ä½“çš„ã«ä½•ãŒé•ã†ã®ã‹ã¡ã‚‡ã£ã¨èª¿ã¹ã¦ã¿ã¾ã—ãŸã€‚ オープンã™ã‚‹ãƒ—ãƒã‚»ã‚¹ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ （/proc）ã®ãƒ•ã‚¡ã‚¤ãƒ«ãŒé•ã†æ°—ãŒã™ã‚‹ã®ã§ã€strace ã§èª¿ã¹ã¦ã¿ã¾ã—ãŸã€‚ vmstat ãŒã‚ªãƒ¼ãƒ—ンã—ã¦ã„るファイルを調ã¹ã‚‹ã€‚ % strace -e open vmstat 1 1 open("/etc/ld.so.cache", O_RDONLY) = 3 open("/lib/libproc-3.2.7.so", O_RDONLY) = 3 open("/lib/libc.so.6", O_RDONLY) = 3 open("/proc/stat", O_RDONLY) = 3 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r
Unbreakable Enterprise Kernelã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã¯éžåŒæœŸI/Oã‹?
å°å¹¡ã•ã‚“ã€yohei-aã•ã‚“ã€wmo6hashã•ã‚“ãªã©ã€ã„ã‚ã„ã‚ã”æ„見ãŒã‚ã‚Šã¾ã—ãŸãŒã€ä¸€åº¦ã€Oracleã®éžåŒæœŸI/Oã®å®Ÿè£…ã¯ã©ã†ã ã£ãŸã®ã‹å†ç¢ºèªãŒå¿…è¦ã ã¨æ€ã„ã¡ã‚‡ã£ã¨èª¿ã¹ã¦ã¿ã¾ã™ã€‚ 手当ãŸã‚Šæ¬¡ç¬¬ã‚„ã£ã¦ã‚‚ã—ょã†ãŒãªã„ã®ã§ã€ä»¥ä¸‹ã®3ã¤ã®è¦³ç‚¹ã§èª¿æŸ»ã—ã¦ã¿ã¾ã™ã€‚多分ã€ä½•å›žã‹ã«åˆ†ã‘ã¦èª¿æŸ»ã™ã‚‹ã¨æ€ã†ã®ã§ã™ãŒã€ä»Šå›žã¯åˆæœŸåŒ–パラメータfilesystemio_options = [none|directio|asynch|setall]ã§ã©ã®ã‚ˆã†ã«I/Oã«é–¢ã™ã‚‹ã‚·ã‚¹ãƒ†ãƒ コールãŒå¤‰åŒ–ã™ã‚‹ã‹è¦‹ã¦ã¿ã¾ã™ã€‚ 1. データファイルã¸ã®æ›¸ã込㿠ã“ã‚Œã¯ã€DBWRãŒè¡Œã£ã¦ã„ã¾ã™ã®ã§ã€filesystemio_optionsã®å„モードã§DBWRãŒopen|writeã‚’ ã©ã®ã‚ˆã†ã«å®Ÿè¡Œã—ã¦ã„ã‚‹ã‹? 2.REDOã¸ã®æ›¸ã込㿠ã“ã‚Œã¯ã€LGWRãŒè¡Œã£ã¦ã„ã¾ã™ã®ã§ã€filesystemio_optionsã®å„モードã§LGWRãŒ
linux ã®ã‚·ã‚¹ãƒ†ãƒ コールをフックã™ã‚‹ : DSAS開発者ã®éƒ¨å±‹
最近ã€ã¨ã‚るクãƒãƒ¼ã‚ºãƒ‰ã‚½ãƒ¼ã‚¹ãªãƒ‡ãƒã‚¤ã‚¹ç®¡ç†ãƒ„ールã®æŒ™å‹•ãŒæ°—ã«ãªã‚Šã€ãã®å‹•ä½œã«ã¤ã„ã¦è§£æžã—ã¦ã¿ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ プãƒã‚°ãƒ©ãƒ をデãƒãƒƒã‚°ã—ãŸã‚Šè§£æžã—ãŸã„時ã€ã©ã‚“ãªã‚·ã‚¹ãƒ†ãƒ コールãŒå‘¼ã°ã‚Œã€ã©ã®ã‚ˆã†ãªå¼•æ•°ãŒæ¸¡ã•ã‚Œã¦ã„ã‚‹ã‹ã‚’ã€èª¿ã¹ã‚‹ã“ã¨ãŒã§ãã‚‹ strace ã¯éžå¸¸ã«æœ‰ç”¨ã§ã™ã€‚ ã—ã‹ã—ã€strace ã§ã¯ ioctl ã§æ¸¡ã•ã‚Œã‚‹è¤‡é›‘ãªãƒ‡ãƒ¼ã‚¿æ§‹é€ を表示ã™ã‚‹ã“ã¨ã¯ã§ããªã„ãŸã‚ã€ã‚·ã‚¹ãƒ†ãƒ コールをフックã—ã¦å¼•æ•°ã‚’表示ã™ã‚‹ã¨ã„ã†æ‰‹æ®µã‚’å–ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ ãã‚“ãªè¨³ã§ linux ã§ã‚·ã‚¹ãƒ†ãƒ コールをフックã™ã‚‹æ–¹æ³•ã«ã¤ã„ã¦èª¿ã¹ã¦è¦‹ãŸã¨ã“ã‚ã€æ„外ã¨ã„ã‚ã„ã‚ãªæ–¹æ³•ãŒæœ‰ã‚‹ã“ã¨ã‚’知りã¾ã—ãŸã®ã§ã€è©¦ã—ã¦ã¿ãŸæ–¹æ³•ã‚’å¹¾ã¤ã‹ç´¹ä»‹ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ 注)今回ã®å®Ÿé¨“ã«ä½¿ç”¨ã—㟠linux kernel ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯ 2.6.25.11 ã§ã™ã€‚ç•°ãªã‚‹ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã¯ã“ã®å®Ÿé¨“通りã«ã¯ãªã‚‰ãªã„å ´åˆãŒã‚ã‚Šã¾ã™ã€‚ LD_PRELOAD を使ã£
ï¼ IT：Security Tips > ä¸å¯©ãªãƒ—ãƒã‚»ã‚¹ã‚’調査ã™ã‚‹
システム管ç†ä½œæ¥ä¸ã«ãµã¨è¦‹ã‚‹ã¨ã€å¹¸ã‹ä¸å¹¸ã‹ä¸å¯©ãªãƒ—ãƒã‚»ã‚¹ã‚’見ã¤ã‘ã¦ã—ã¾ã£ãŸã€‚ãã‚“ãªã¨ãã®èª¿æŸ»æ‰‹é †ã«ç››ã‚Šè¾¼ã‚“ã§ãŠãã¨å½¹ã«ç«‹ã¤ã®ãŒã€strace（Linuxãªã©ï¼‰ã‚„truss（Solaris）ãªã©ã®ãƒ‡ãƒãƒƒã‚°ã‚³ãƒžãƒ³ãƒ‰ã«ã‚ˆã‚‹èª¿æŸ»ã§ã‚る。 root権é™ãŒã‚ã‚Œã°straceã‚„trussコマンドを使用ã—ã¦ä»»æ„ã®ã‚¿ã‚¹ã‚¯ã«å¯¾ã—ã¦ã€ãã®ã‚¿ã‚¹ã‚¯ã«ãŠã‘るシステムコールã®å®Ÿè¡ŒçŠ¶æ³ã‚’表示ã•ã›ã‚‹ã“ã¨ã§ã€ãã®ã‚¿ã‚¹ã‚¯ãŒã€Œä½•ã‚’ã—よã†ã¨ã—ã¦ã„ã‚‹ã‹ï¼Ÿã€ã‚’çªãæ¢ã‚ã‚‰ã‚Œã‚‹å ´åˆãŒã‚る。例ãˆã°ã€ä¸å¯©ãªæ™‚刻ã«ã‚·ã‚§ãƒ«ã«ãƒã‚°ã‚¤ãƒ³ã—ã¦ã„るユーザーを発見ã—ãŸã¨ã—よã†ã€‚ [root@voyager admin]# who admin pts/0 Dec 25 12:28 (admin.localdomain.local) joe pts/1 Dec 25 13:22 (dsl-192038.example.com) <--ä¸å¯©ãƒ¦ãƒ¼ã‚¶ãƒ¼ [root@
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Google Code Archive - Long-term storage for Google Code Project Hosting.
http://tmm1.net/ey-debugging-ruby.pdf
Exploring Oracle Internals
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