Firefox OS/Performance/Profiling: Difference between revisions

Firefox OS/Performance/Profiling (view source)

575 bytes added , 9 June 2014

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 = Profiling with systrace =
 Good at: Shows process preemption, shows all calls to instrumented functions, Familiar for android developers
 Bad at: Requires configure option, higher overhead
-'''Better instructions coming:''' Build with '--enable-systrace' and follow [http://developer.android.com/tools/help/systrace.html these instructions for systrace.py].
+*Download android sdk to get systrace tool:
+**[http://developer.android.com/sdk/index.html 1. download link]
+**2. the systrace.py tool is at path-to-android-sdk/tools/systrace
+*Enable systrace in B2G:
+**Build with '--enable-systrace' config or just uncomment the MOZ_USE_SYSTRACE define in gecko/tools/profiler/GeckoProfilerImpl.h like:
+<pre>
+#define MOZ_USE_SYSTRACE
+#ifdef MOZ_USE_SYSTRACE
+# define ATRACE_TAG ATRACE_TAG_ALWAYS
+// We need HAVE_ANDROID_OS to be defined for Trace.h.
+// If its not set we will set it temporary and remove it.
+# ifndef HAVE_ANDROID_OS
+#   define HAVE_ANDROID_OS
+#   define REMOVE_HAVE_ANDROID_OS
+# endif
+</pre>
-Note: Gecko code is tagged as ATRACE_TAG_ALWAYS, so the command is for your reference.
+*How to use systrace:
+**[http://developer.android.com/tools/help/systrace.html systrace.py document]
+**./systrace.py --time=10 -o mynewtrace.html sched
-./systrace.py --time=10 -o mynewtrace.html sched
+Note: Gecko code is tagged as ATRACE_TAG_ALWAYS, so we don't set the category type.