GitHub - ocaml-multicore/eio: Effects-based direct-style IO for multicore OCaml
The Unix library provided with OCaml uses blocking IO operations, and is not well suited to concurrent programs such as network services or interactive applications. For many years, the solution was to use libraries such as Lwt and Async, which provide a monadic interface. These libraries allow writing code as if there were multiple threads of execution, each with their own stack, but the stacks a
GitHub - janestreet/magic-trace: magic-trace collects and displays high-resolution traces of what a process is doing
magic-trace collects and displays high-resolution traces of what a process is doing. People have used it to: figure out why an application running in production handles some requests slowly while simultaneously handling a sea of uninteresting requests, look at what their code is actually doing instead of what they think it's doing, get a history of what their application was doing before it crashe
traceback — Print or retrieve a stack traceback
traceback — Print or retrieve a stack traceback¶ Source code: Lib/traceback.py This module provides a standard interface to extract, format and print stack traces of Python programs. It exactly mimics the behavior of the Python interpreter when it prints a stack trace. This is useful when you want to print stack traces under program control, such as in a “wrapper†around the interpreter. The modul
Pythonã§ã‚¹ãƒ¬ãƒƒãƒ‰ã®ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’出力ã—ãŸã„ - CLOVERðŸ€
ã“ã‚Œã¯ã€ãªã«ã‚’ã—ãŸãã¦æ›¸ã„ãŸã‚‚ã®ï¼Ÿ Pythonã§ã€å‹•ä½œã—ã¦ã„るスレッドã®ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’出力ã™ã‚‹æ–¹æ³•ã¯ï¼Ÿã¨ã„ã†ã“ã¨ã§ã€‚ 環境 今回ã®ç’°å¢ƒã¯ã€ã“ã¡ã‚‰ã€‚ $ python3 -V Python 3.8.10 使ã†æ¨™æº–ライブラリ 今回ã®ç›®çš„ã¯ã€ã“ã®ã‚ãŸã‚Šã‚’使ãˆã°è‰¯ã•ãã†ã§ã™ã€‚ traceback --- スタックトレースã®è¡¨ç¤ºã¾ãŸã¯å–å¾— — Python 3.8.10 ドã‚ュメント sys --- システムパラメータã¨é–¢æ•° — Python 3.8.10 ドã‚ュメント threading --- スレッドベースã®ä¸¦åˆ—å‡¦ç† â€” Python 3.8.10 ドã‚ュメント 以é™ã€ã“れらを使ã£ã¦ã¡ã‚‡ã£ã¨è©¦ã—ã¦ã„ããŸã„ã¨æ€ã„ã¾ã™ã€‚ スタックトレースを出力ã™ã‚‹ã‚³ãƒ¼ãƒ‰ã‚’埋ã‚込む ã¾ãšã¯ã€ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’出力ã—ãŸã„処ç†è‡ªä½“ã®ä¸ã«ã€ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’出力ã™ã‚‹ã‚³ãƒ¼ãƒ‰ã‚’埋ã‚込んã§ã¿ã¾ã™ã€‚ thread_dump
第688回　eBPFã®ã‚³ãƒ³ãƒ‘イラーã«å¯¾å¿œã—ãŸãƒ„ールã§ã•ã¾ã–ã¾ãªæŒ™å‹•ã‚’å¯è¦–化ã™ã‚‹ | gihyo.jp
実行ä¸ã®ã‚·ã‚¹ãƒ†ãƒ ã®æŒ™å‹•ã‚’詳細ã«ãƒˆãƒ¬ãƒ¼ã‚¹ã™ã‚‹ä»•çµ„ã¿ã¯ã€ç‰¹ã«ã€Œã‚ˆãã‚ã‹ã‚‰ãªã„å•é¡Œã€ã«éé‡ã—ã¦ã„る時ã«é‡è¦ã§ã™ã€‚今回ã¯Linuxå‘ã‘ã®ãƒˆãƒ¬ãƒ¼ã‚·ãƒ³ã‚°ãƒ„ールã®æœ¬å‘½ã¨ã‚‚言ãˆã‚‹eBPFを利用ã—ãŸå„種ツールを紹介ã—ã¾ã™ã€‚ eBPFã«é–¢ã™ã‚‹è¨˜äº‹ãŒä»Šå›žä»¥é™ã€æ•°å›žã«ã‚ãŸã£ã¦è§£èª¬ã•ã‚Œã¦ã„ã¾ã™ã€‚ã‚ã‚ã›ã¦ã”覧ãã ã•ã„。 第688回　eBPFã®ã‚³ãƒ³ãƒ‘イラーã«å¯¾å¿œã—ãŸãƒ„ールã§ã•ã¾ã–ã¾ãªæŒ™å‹•ã‚’å¯è¦–化ã™ã‚‹ï¼ˆä»Šå›žã®è¨˜äº‹ï¼‰ 第690回　BCCã§eBPFã®ã‚³ãƒ¼ãƒ‰ã‚’書ã„ã¦ã¿ã‚‹ 第692回　sysfsã‚„bpftoolを用ã„ãŸeBPFã®æ´»ç”¨ 第694回　libbpfã¨clangã§ãƒãƒ¼ã‚¿ãƒ–ルãªBPF CO-REãƒã‚¤ãƒŠãƒªä½œæˆ 第695回　入門BPF CO-RE eBPFã¨BPF Compiler Collection 改ã‚ã¦è¨€ã†ã¾ã§ã‚‚ãªãã€Linuxカーãƒãƒ«ã‚‚ã—ãã¯ã‚«ãƒ¼ãƒãƒ«ä¸Šã§å‹•ã„ã¦ã„ã‚‹å„種タスクã®ãƒ‘フォーマンスや挙動を調ã¹ãªãã¦ã¯ãªã‚‰ãªã„
Perfetto Trace ã‚’ SQL ã§èªã‚€ - Morrita Notes
Perfetto ã¯å†…蔵㮠Trace Processor を使ã£ã¦ãƒˆãƒ¬ãƒ¼ã‚·ãƒ³ã‚°çµæžœã‚’ SQL ã§é›†è¨ˆã§ãる。SQL を使ã£ã¦èˆˆå‘³ã®ã‚るデータをå–り出ã™ã“ã¨ã§ 標準㮠Perfetto UI ã§ã¯èªã¿å–ã‚Šã«ãã„傾å‘ã‚’å¯è¦–化ã—ãŸã‚Šã€ å¯è¦–化を通ã—ã¦æ°—ã¥ã„ãŸå‚¾å‘を定é‡çš„ã«æ¯”較ã§ãるよã†ã«ãªã‚‹ã€‚ ã“れ㯠Systrace ã«ã¯ãªã‹ã£ãŸå¤§ããªåˆ©ç‚¹ã 。 ã“ã®è¨˜äº‹ã§ã¯ Twitter 㨠Instagram アプリã®ã‚¹ã‚¯ãƒãƒ¼ãƒ«æ€§èƒ½ã‚’評価ã™ã‚‹å®Ÿä¾‹ã‚’交㈠Trace Processor ã® SQL インターフェイスを紹介ã™ã‚‹ã€‚ Twitter vs. Instagram ã‚ã‚‹ Podcast ã‚’èžã„ã¦ã„ãŸã‚‰ã€ãƒ›ã‚¹ãƒˆã® iPhone ユーザãŒæ°—ã¾ãã‚Œã§è§¦ã£ãŸ Android 端末をレビューã—ã¦ã„ãŸã€‚å½¼ã«ã‚ˆã‚Œã° Android ã® Twitter アプリ㯠iPhone ã«æ¯”ã¹ã‚¹ã‚¯ãƒãƒ¼ãƒ«ã®å‡ºæ¥ãŒéžå¸¸ã«æ‚ªã„ã¨ã„
ã¨ã‚Šã‚ãˆãšä½¿ã† Perfetto - Morrita Notes
Perfetto 㯠Systrace ã®å¾Œç¶™ã¨ãªã‚‹ Android ã®ãƒˆãƒ¬ãƒ¼ã‚·ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ ã 。Android P ã‹ã‚‰å°Žå…¥ã•ã‚Œ, Android 10 ã‹ã‚‰ã ã„ãŸã„ã¾ã¨ã‚‚ã«ä½¿ãˆã‚‹ã€‚Systrace ã«ã¯ãªã„様々ãªä¾¿åˆ©æ©Ÿèƒ½ãŒã‚ã‚‹ãŸã‚森田ã¯ã“ã“一年㧠Systrace ã‹ã‚‰ Perfetto ã«ä¹—ã‚Šæ›ãˆãŸã€‚今後ã®è¨˜äº‹ã§ãªã«ã‹ã¨ Perfetto を使ã†äºˆå®šãªã®ã§ã€ã“ã®è¨˜äº‹ã§æœ€ä½Žé™ã®ä½¿ã„方を紹介ã—ã¦ãŠããŸã„。 ãªãŠã“ã®è¨˜äº‹ã¯ Systrace を使ã£ã¦ã„る人ãŒä¹—ã‚Šæ›ãˆã‚‹ãŸã‚ã®å‚考ã«æ›¸ã„ãŸã€‚トレーシング自体ã®æœ‰ç”¨æ€§ã«ã¤ã„ã¦ã¯ã€ä»Šå¾Œã®è¨˜äº‹ã§å¾ã€…ã«è°è«–ã—ã¦ã„ããŸã„。 ADB ã‹ã‚‰ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’ã¨ã‚‹ Systrace ã¯ãƒ‡ãƒã‚¤ã‚¹ã«ã‚ã‚‹ atrace コマンドを Python ã§ãƒ©ãƒƒãƒ—ã—ãŸã‚‚ã®ã ã£ãŸã€‚Perfetto ã§ã¯ãƒ‡ãƒã‚¤ã‚¹ã® perfetto コマンドを直接使ã†ã€‚ $ adb shell perfe
uftrace を使ã£ã¦ãƒ—ãƒã‚°ãƒ©ãƒ ã®ä¸èº«ã‚’解æž/リãƒãƒ¼ã‚¹ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ãƒªãƒ³ã‚°ã™ã‚‹ (1) uftrace 紹介編 - namopa’s blog
ã¯ã˜ã‚ã« Linuxã®uftraceã¨ã„ã†ãƒ„ールを使ã†ã¨, ã‚るプãƒã‚°ãƒ©ãƒ を実行ã—ã¦ã„ã‚‹éš›ã®é–¢æ•°å‘¼ã³å‡ºã—ã®å›žæ•°ã‚„ 呼ã³å‡ºã—ã®å±¥æ´(呼ã³å‡ºã•ã‚ŒãŸé †ç•ª)を記録, 表示ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™. ã“ã®è¨˜äº‹ã§ã¯, uftraceã®ä½¿ã„æ–¹ã¨, ãれを使ã£ã¦ä¸èº«ã®ã‚ˆãã‚ã‹ã‚‰ãªã„ プãƒã‚°ãƒ©ãƒ ã®ä¸èº«ã‚’調査ã™ã‚‹(リãƒãƒ¼ã‚¹ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ãƒªãƒ³ã‚°ã™ã‚‹) 方法を紹介ã—ã¾ã™. 例題ã¨ã—ã¦, スプレッドシートプãƒã‚°ãƒ©ãƒ gnumericã®ã‚»ãƒ«ã« å¼ã‚’入力ã—ãŸéš›, ãã®ä¸èº«ã‚’èªã¿å–ã£ã¦ã„る関数åã‚„, ãã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã®å ´æ‰€ã‚’çªãæ¢ã‚ã‚‹ã“ã¨ã‚’目標ã«ã—ã¾ã™ (例ãˆã°gnumericã«æ–°ã—ã„関数を付ã‘åŠ ãˆã‚‹ã¨ã„ã†å¤‰æ›´ã‚’ ã—ãŸã„ã¨æƒ³åƒã—ã¦ãã ã•ã„). ã“ã®ã‚ˆã†ã«, ã‚るプãƒã‚°ãƒ©ãƒ ã®æ©Ÿèƒ½å¤‰æ›´ã‚„拡張をã—ãŸã„ã¨ã„ã†ã¨ãã«, ã‚る機能を担ã£ã¦ã„ã‚‹ã®ã¯, ã©ã®ã‚½ãƒ¼ã‚¹ãƒ•ã‚¡ã‚¤ãƒ«ã‚„関数ãªã®ã‹ を調ã¹ã‚‹ã¨ã„ã†èª¿æŸ»ãŒã—ã°ã—ã°å¿…è¦ã«ãªã‚Šã¾ã™. ã“ã®æ™‚, uftr
rr: lightweight recording & deterministic debugging
what rr does rr aspires to be your primary C/C++ debugging tool for Linux, replacing — well, enhancing — gdb. You record a failure once, then debug the recording, deterministically, as many times as you want. The same execution is replayed every time. rr also provides efficient reverse execution under gdb. Set breakpoints and data watchpoints and quickly reverse-execute to where they were hit. rr
ipftrace: A Linux Function Tracer for Network People
Kernel/VM/探検隊online part1ã§ã®ç™ºè¡¨è³‡æ–™
unameコマンドã‹ã‚‰å§‹ã‚るデãƒãƒƒã‚°ï¼†ã‚«ãƒ¼ãƒãƒ«ãƒãƒƒã‚¯å…¥é–€ - φ(・・*)ã‚ž ｳｰï¾ã€€ã‚«ãƒ¼ãƒãƒ«ã¨ã‹å¼„ã£ãŸã‚Šã®ãƒ¡ãƒ¢
ã“ã®è¨˜äº‹ã¯Linux Advent Calendar 2019ã®1日目ã®è¨˜äº‹ã§ã™ã€‚ ã¯ã˜ã‚㫠環境 ãŠã“ã¨ã‚ã‚Š uname(1) uname(1)ãŒå‡ºåŠ›ã™ã‚‹å†…容 strace(1) gdb(1) bpftrace systemtap Kernel Hack Livepatch ãŠã¾ã‘ RHEL 8.1 CentOS 8 ã¾ã¨ã‚ ã¯ã˜ã‚㫠本記事ã§ã¯Linuxサーãƒã®ãƒ›ã‚¹ãƒˆåã€Linuxカーãƒãƒ«ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã€cpuアーã‚テクãƒãƒ£ãªã©ã®ã‚·ã‚¹ãƒ†ãƒ æƒ…å ±ã‚’è¡¨ç¤ºã™ã‚‹uname(1)を利用ã—ã¦Linux環境ã§ã®ãƒ‡ãƒãƒƒã‚°ã¨ã‚«ãƒ¼ãƒãƒ«ãƒãƒƒã‚¯ã«ã¤ã„ã¦èª¬æ˜Žã—ã¦ã„ãã¾ã™ã€‚本記事ã§ã¯ã‚³ãƒžãƒ³ãƒ‰ã‚„ツールã®ä½¿ã„æ–¹ã®èª¬æ˜Žã§ã¯ãªãã¦ã€ãれらを使ã£ã¦ã©ã®ã‚ˆã†ã«ãƒ‡ãƒãƒƒã‚°ã™ã‚‹ã®ã‹ã¨ã„ã†ã¨ã“ã‚を説明ã—ã¾ã™ã€‚ 環境 ディストリビューションã«ã¯Fedora 31(x86_64)を利用ã—ã¾ã™ã€‚動作環境ã¯QEMUã‚„libvirtã€Oracle
iovisor/bcc: BCC - Tools for BPF-based Linux IO analysis, networking, monitoring, and more
BCC is a toolkit for creating efficient kernel tracing and manipulation programs, and includes several useful tools and examples. It makes use of extended BPF (Berkeley Packet Filters), formally known as eBPF, a new feature that was first added to Linux 3.15. Much of what BCC uses requires Linux 4.1 and above. eBPF was described by Ingo Molnár as: One of the more interesting features in this cycle
stack ã§ã‚¢ãƒ—リケーションã®ãƒãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’å–å¾—ã™ã‚‹ (デãƒãƒƒã‚°)
ã¯ã˜ã‚ã« Haskell ã®ãƒ‡ãƒãƒƒã‚°æ‰‹æ³•ã«ã¤ã„ã¦ã¯ã€ä»¥ä¸‹ã®è¨˜äº‹ãŒã¨ã¦ã‚‚詳ã—ãå‚考ã«ãªã‚Šã¾ã™ã€‚ç´ æ™´ã‚‰ã—ã„記事ã§ã™ã€‚ Haskell ã§ã®ãƒ‡ãƒãƒƒã‚°æ‰‹æ³•ã‚ã‚Œã“ã‚Œ 今回ã¯Haskellアプリケーションをデãƒãƒƒã‚¯ã™ã‚‹éš›ã«ã€ãƒãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã®ã¨ã¦ã‚‚ç°¡å˜ãªå–得方法ãŒã‚ã£ãŸã®ã§ã”紹介ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ ã¾ã¨ã‚ã‚‹ã¨ä»¥ä¸‹ã®2è¡Œã§ã™ã€‚ $ stack build --profile $ stack exec -- <exe_name> +RTS -xc ãƒãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã®å–得方法 ã¾ãšã€ãƒãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’å–å¾—ã™ã‚‹ãŸã‚ã« GHC.Stack ã§å®šç¾©ã•ã‚Œã¦ã„ã‚‹ HasCallStack をクラス制約ã¨ã—ã¦è¿½åŠ ã—ã¾ã™ã€‚
qira
qira ./a.out QIRA is a timeless debugger. All state is tracked while a program is running, so you can debug in the past. Install it now. Linux required, 64-bit Ubuntu recommended. cd ~/ && wget -qO- https://github.com/geohot/qira/archive/v1.3.tar.gz | tar zx && cd qira-1.3 && ./install.sh b *0x8048446 Your breakpoint was hit 5 times, at change 90, 111, 128, 145, and 162. I drew red lines in the vt
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Perfetto - System profiling, app tracing and trace analysis
GitHub - imos/imosh: BASH library containing utilities like gflags and glog and PHP-like functions.
KernelShark
dwarf · Wiki · Glasgow Haskell Compiler / GHC · GitLab
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