Linux perfã§å¿«é©ã«è¨ˆæ¸¬ã™ã‚‹ãŸã‚ã®tips - Qiitaã“ã‚ŒãŒã‚ã‚‹ã®ã¨ãªã„ã®ã¨ã§ã¯åˆ†ã‹ã‚Šã‚„ã™ã•ãŒå…¨ç„¶é•ã†ã®ã§ã€perfを使ã†æ™‚ã¯å¸¸ã«å…¥ã‚Œã¦ãŠãよã†ã«ã™ã‚‹ã¨ä¾¿åˆ©ã§ã™ã€‚ 2. --call-graph 㯠fp 以外ã§ä½¿ã† 上記ã®å•é¡Œã‚’解決ã™ã‚‹ã¨ perf record + perf report ã§ã¯ä½•ãŒå‘¼ã°ã‚Œã¦ã„ã‚‹ã‹ãŠãŠã‚€ã分ã‹ã‚‹ã“ã¨ãŒå¤šã„ã®ã§ã™ãŒã€call graphを出ã™ãŸã‚ã« perf record -g ã‚’ã™ã‚‹ã¨ [unknown] ã¨ã„ã†ã®ãŒå‡ºã¦ãã¦ã—ã¾ã†ã“ã¨ãŒã‚ã‚Šã¾ã™ã€‚(以é™ã®è¨ˆæ¸¬çµæžœã¯Rack::Utils::HeaderHashを使ã£ãŸRuby VMã®ãƒ™ãƒ³ãƒã‚’Rubyã®masterã§èµ°ã‚‰ã›ãŸã‚‚ã®ã§ã™) Samples: 38K of event 'cycles:ppp', Event count (approx.): 271180000 Children Self Command Shared Object Symbol - 1
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