{"id":467,"date":"2010-03-19T22:14:25","date_gmt":"2010-03-20T06:14:25","guid":{"rendered":"http:\/\/www.visophyte.org\/blog\/?p=467"},"modified":"2010-03-19T22:14:25","modified_gmt":"2010-03-20T06:14:25","slug":"more-systemtap-mozilla-event-loop-awareness","status":"publish","type":"post","link":"https:\/\/www.visophyte.org\/blog\/2010\/03\/19\/more-systemtap-mozilla-event-loop-awareness\/","title":{"rendered":"more systemtap mozilla event loop awareness"},"content":{"rendered":"<pre>====================\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ms\u00a0\u00a0\u00a0 #\r\n----- Event Loop:\r\n  nsInputStreamReadyEvent\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7119\u00a0\u00a0 11\r\n----- Input Events:\r\n  nsInputStreamPump\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7119\u00a0\u00a0 11\r\n----- Pump Events:\r\n  thunk:nsNNTPProtocol::QueryInterface(...)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7119\u00a0\u00a0 11\r\n\r\n====================\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ms\u00a0\u00a0\u00a0 #\r\n----- Event Loop:\r\n  nsInputStreamReadyEvent\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6284\u00a0\u00a0 15\r\n  nsTimerEvent\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 242\u00a0 123\r\n----- Timers:\r\n  nsUITimerCallback\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 121\u00a0\u00a0\u00a0 2\r\n----- Input Events:\r\n  nsInputStreamPump\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6284\u00a0\u00a0 15\r\n----- Pump Events:\r\n  thunk:nsNNTPProtocol::QueryInterface(...)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6283\u00a0\u00a0 15\r\n\r\n<\/pre>\n<p>As of late, I&#8217;ve noticed that Thunderbird has been pegging one of my CPU cores periodically in ways not correlated with gloda activity, the usual scapegoat.\u00a0 With <a href=\"http:\/\/hg.mozilla.org\/users\/bugmail_asutherland.org\/tb-test-help\/rev\/834aa5e0c42d\">some enhancements<\/a> to my systemtap script from <a href=\"http:\/\/www.visophyte.org\/blog\/2010\/02\/12\/using-systemtap-to-figure-what-your-mozilla-apps-event-loop-is-up-to\/\">last time<\/a>, I can now see that it apparently takes something like 13 seconds of dominating the event loop to perform the check for new messages in my 26 subscribed news folders on news.mozilla.org.\u00a0 Yowch.\u00a0 At least this is on a debug build!<\/p>\n<p>Changes are that we now cover input stream ready events, input pump listeners, and proxied objects (which lets us see what Thunderbird IMAP gets up to).\u00a0 Also, the output is more concise and only shows things that take at least 100ms of aggregate wall clock time.<\/p>\n<p>Script invocation currently wants to look like this:<br \/>\n<em>sudo stap -v moz-event-loop.stp \/path\/to\/thunderbird\/objdir\/mozilla\/dist\/lib\/libxpcom_core.so \/path\/to\/thunderbird\/objdir\/mozilla\/dist\/bin\/components\/libnecko.so | ..\/addrsymfilt.py `pgrep thunderbird-bin`<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>====================\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ms\u00a0\u00a0\u00a0 # &#8212;&#8211; Event Loop: nsInputStreamReadyEvent\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7119\u00a0\u00a0 11 &#8212;&#8211; Input Events: nsInputStreamPump\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7119\u00a0\u00a0 11 &#8212;&#8211; Pump Events: thunk:nsNNTPProtocol::QueryInterface(&#8230;)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 7119\u00a0\u00a0 11 ====================\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ms\u00a0\u00a0\u00a0 # &#8212;&#8211; Event Loop: nsInputStreamReadyEvent\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 6284\u00a0\u00a0 15 nsTimerEvent\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 242\u00a0 123 &#8212;&#8211; Timers: nsUITimerCallback\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 121\u00a0\u00a0\u00a0 2 &#8212;&#8211; Input &hellip; <a href=\"https:\/\/www.visophyte.org\/blog\/2010\/03\/19\/more-systemtap-mozilla-event-loop-awareness\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[3,6],"tags":[76,77],"class_list":["post-467","post","type-post","status-publish","format-standard","hentry","category-mozilla","category-thunderbird","tag-systemtap","tag-utrace"],"_links":{"self":[{"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/posts\/467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/comments?post=467"}],"version-history":[{"count":3,"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/posts\/467\/revisions"}],"predecessor-version":[{"id":470,"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/posts\/467\/revisions\/470"}],"wp:attachment":[{"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/media?parent=467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/categories?post=467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.visophyte.org\/blog\/wp-json\/wp\/v2\/tags?post=467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}