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perf を使ã£ã¦ãƒ—ãƒãƒ•ã‚¡ã‚¤ãƒ«ã‚’å–る方法(ãã®2) - pyopyopyo - Linuxã¨ã‹ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®è¦šãˆæ›¸ã -
perfã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«æ–¹æ³•ã¯ã€http://d.hatena.ne.jp/pyopyopyo/20140702/p1 ã‚’å‚ç…§ã—ã¦ãã ã•ã„。 è¦ç‚¹ã ã‘ã¾ã¨ã‚る㨠debian ã‚„ ubuntu ãªã‚‰ $ apt-cache search linux-perf $ sudo apt install linux-perf-5.3 ã§ã‚«ãƒ¼ãƒãƒ«ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã«åˆã‚ã›ãŸ linux-perf パッケージをインストールã™ã‚‹ã ã‘ã§ã™ インストール後㯠$ perf_5.3 ã®ã‚ˆã†ã« perf_ãƒãƒ¼ã‚¸ãƒ§ãƒ³ç•ªå·ã€€ã®ã‚³ãƒžãƒ³ãƒ‰ãŒã¤ã‹ãˆã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã™ 以下コマンドã®ä½¿ç”¨ä¾‹ã‚’ç°¡å˜ã«åˆ—挙ã—ã¾ã™ã€‚表記ã®éƒ½åˆä¸Šï¼Œã‚³ãƒžãƒ³ãƒ‰å㯠perf ã¨ã—ã¦ãŠãã¾ã™ 詳細㯠$ perf --help $ perf record --help ã®ã‚ˆã†ãªæ„Ÿã˜ã§ã€ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³ã‹ã‚‰ help ãŒå‚ç…§ã§ãã¾ã™ã€‚ パフォーマンスカウンタã®çµ±è¨ˆæƒ…å ±
トレースデータをå¯è¦–化ã™ã‚‹ d3js_trace ã‚’ã¤ãã‚Šã¾ã—ãŸ
ã¯ã˜ã‚㫠ソフトウェアã®æ€§èƒ½è§£æžã‚’ã—ã¦ã„る時ã€ã©ã“ã«CPUボトルãƒãƒƒã‚¯ãŒã‚ã‚‹ã®ã‹çŸ¥ã‚ŠãŸããªã‚‹ã“ã¨ãŒã‚ã‚Šã¾ã™ã€‚ãã†ã„ã£ãŸå ´åˆã€ãƒ—ãƒãƒ•ã‚¡ã‚¤ãƒªãƒ³ã‚°ãƒ„ールを使ã£ã¦ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’採å–ã—ã€CPUを消費ã—ã¦ã„ã‚‹å ´æ‰€ã‚„å‰²åˆã«é–¢ã™ã‚‹çµ±è¨ˆæƒ…å ±ã‚’è§£æžã™ã‚‹ã®ãŒæœ‰åŠ¹ã§ã™ã€‚ã—ã‹ã—ã€ä¸€èˆ¬çš„ã«æŽ¡å–ã™ã‚‹ãƒ‡ãƒ¼ã‚¿é‡ã¯è†¨å¤§ã«ãªã£ã¦ã—ã¾ã„ã€æ¬²ã—ã„æƒ…å ±ã‚’è§£æžã™ã‚‹ã®ã¯ãªã‹ãªã‹éª¨ã®æŠ˜ã‚Œã‚‹ä½œæ¥ã§ã™ã€‚ ãã“ã§ã€ä»Šå›žã¯ãƒˆãƒ¬ãƒ¼ã‚¹æƒ…å ±ã‚’å¯è¦–化ã™ã‚‹ãƒ„ール：d3js_trace を作ã£ã¦ã¿ã¾ã—ãŸã€‚d3js_trace ã¯ã€perf ã§å–å¾—ã—ãŸã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹æƒ…å ±ã‚’ã€JavaScript ライブラリ : D3js を用ã„ã¦å¯è¦–化ã—ã¾ã™ã€‚å¯è¦–化ã«ã‚ˆã‚Šã€äººé–“ãŒè§£æžã—ã‚„ã™ã„å½¢ã§è¡¨ç¾ã™ã‚‹ã“ã¨ã§ã€ã‚ˆã‚Šå®¹æ˜“ã«ãƒˆãƒ¬ãƒ¼ã‚¹ãƒ‡ãƒ¼ã‚¿ã‚’解æžã§ãるよã†ã«ãªã‚Šã¾ã™ã€‚ コードã«ã¤ã„ã¦ã¯ GitHub ã«å…¬é–‹ã—ã¦ã„ã¾ã™ï¼š Etsukata/d3js_trace 例 以下ã«æŽ²è¼‰ã—ãŸ
Units of perf stat statistics
The unit is "single cache access" for loads, stores, references and misses. Loads correspond to count of load instructions, executed by processors; same for stores. Misses is the count, how much loads and stores were unable to get their data loaded from the cache of this level: L1 data cache for L1-dcache- events; Last Level Cache (usually L2 or L3 depending on your platform) for cache- events. 31
Linux perf Examples
Recent posts: 29 Oct 2024 » AI Flame Graphs 22 Jul 2024 » No More Blue Fridays 24 Mar 2024 » Linux Crisis Tools 17 Mar 2024 » The Return of the Frame Pointers 10 Mar 2024 » eBPF Documentary 28 Apr 2023 » eBPF Observability Tools Are Not Security Tools 01 Mar 2023 » USENIX SREcon APAC 2022: Computing Performance: What's on the Horizon 17 Feb 2023 » USENIX SREcon APAC 2023: CFP 02 May 2022 » Brendan
Call stack in the perf profiler
I'm running "perf" in the following way: perf record -a --call-graph -p some_pid perf report --call-graph --stdio Then, I see this: 1.60% my_binary my_binary [.] my_func | --- my_func | |--71.10%-- (nil) | (nil) | --28.90%-- 0x17f310000000a I can't see which functions call my_func(). I see "nil" and "0x17f310000000a" instead. Am I doing something wrong? It is probably not a debug info problem beca
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