Many of those probably aren't even browser threads, but threads for Dalvik and the application framework. For example, here is a list of threads in my browser:
1 7035 native 79 21 main *2 7038 vmwait 10 0 GC *3 7040 vmwait 0 0 Signal Catcher *4 7041 running 0 5 JDWP *5 7042 vmwait 13 7 Compiler *6 7043 wait 0 0 ReferenceQueueDaemon *7 7044 wait 0 0 FinalizerDaemon *8 7045 timed-wait 0 0 FinalizerWatchdogDaemon 9 7046 native 0 0 Binder Thread #1 10 7047 native 0 0 Binder Thread #2 11 7057 wait 0 0 pool-2-thread-1 12 7050 native 0 0 CookieSyncManager 13 7056 timed-wait 2 0 pool-1-thread-2 14 7058 native 322 30 WebViewCoreThread 15 7053 native 2 1 BackgroundHandler 16 7054 timed-wait 0 0 pool-1-thread-1 17 7059 wait 1 0 AsyncTask #1 18 7062 native 8 1 TexturesGenerator *19 7063 wait 10 1 Thread-183 20 7067 native 0 0 Thread-185 21 7066 native 6 0 Thread-186 22 7070 wait 10 1 AsyncTask #2 23 7074 native 18 51 Thread-188 24 7076 native 0 0 Thread-189 25 7077 wait 0 0 AsyncTask #3 26 7078 wait 10 1 AsyncTask #4 27 7079 wait 11 0 AsyncTask #5 WebViewCoreThread is I believe the main browser thread. You can easily see what threads are actually using CPU with "adb shell top -m 10 -t" while you are using the browser. On Thu, Sep 1, 2011 at 12:15 PM, Jack Harvard <[email protected]>wrote: > Thanks for your reply. I'm on the research side, rather than development. I > observed 17-22 threads from com.android.browser, suppose only one of those > thread is doing the real work of rendering the page. > > On 31 Aug 2011, at 22:58, Dianne Hackborn wrote: > > > I really don't know what you are trying to get at. As I said, as far as > I know browser CPU use is generally pretty single-threaded -- the DOM > rendering and JavaScript interpreter all need to run in the same thread. > Just creating more threads doesn't magically allow this work to be spread > across them. > > > > And again, Gingerbread was not written for multi-core CPUs. In fact if > you try to run stock GB on a multi-core CPU you will be extremely unstable > because there are many things not working correctly for SMP, especially ARM > SMP. So it doesn't make sense to ask questions about how stock GB runs on > multi-core, because it just doesn't. > > > > If you are wondering about a particular phone someone has released with > GB, you will need to talk with that manufacturer, because they will have > needed to do some work to have GB run on a multi-core CPU. > > > > On Wed, Aug 31, 2011 at 2:09 PM, Jack Harvard <[email protected]> > wrote: > > Thanks for your reply, Dianne. If I run the Android browser as my only > application in Gingerbread on a quad-core smartphone, and the page to be > loaded is stored locally in memory (no network delay etc, in this case, the > browser is single-threaded only as no network connection?), I wouldn't see > any performance scaling (or worse, as the OS may move the threads to another > core less busy in a circle) from a single-core smartphone, everything else > being the same? > > > > On 31 Aug 2011, at 21:00, Dianne Hackborn wrote: > > > > > Gingerbread isn't designed for multi-core CPUs. The browser doesn't > try to create threads to use multiple CPUs, it creates threads to have > multiple network connections. > > > > > > Besides networking, browsers are pretty intrinsically single-threaded > anyway. The complicated stuff all needs to run in one thread: DOM > rendering, JavaScript, etc. > > > > > > On Wed, Aug 31, 2011 at 12:08 PM, Jack Harvard <[email protected]> > wrote: > > > I want to understand how many threads Gingerbread generates in order to > understand how the browser performance scale with multicores? For example, > if "a few " means 2, that means 4 cores wouldn't scale the browser > performance by anywhere close to 4 times. I understand that Gingerbread > doesn't officially support SMP, sometimes browser does crash on multicore > platforms, it's not a problem for me though. > > > > > > On 31 Aug 2011, at 18:57, Dianne Hackborn wrote: > > > > > > > Oh and Gingerbread wasn't designed to run on anything but single CPU > systems, so that's irrelevant to the question of the base platform. Of > course people shipping Android modify it in various ways, and the browser is > often one of the things they modify. > > > > > > > > On Wed, Aug 31, 2011 at 10:57 AM, Dianne Hackborn < > [email protected]> wrote: > > > > A few. Why? :) > > > > > > > > > > > > On Wed, Aug 31, 2011 at 10:40 AM, Jack Harvard < > [email protected]> wrote: > > > > Wondering how many threads does android browser generate? Suppose > it's Gingerbread running on a dual-core or quad-core ARM processor. > > > > > > > > -- > > > > You received this message because you are subscribed to the Google > > > > Groups "Android Developers" group. > > > > To post to this group, send email to > [email protected] > > > > To unsubscribe from this group, send email to > > > > [email protected] > > > > For more options, visit this group at > > > > http://groups.google.com/group/android-developers?hl=en > > > > > > > > > > > > > > > > -- > > > > Dianne Hackborn > > > > Android framework engineer > > > > [email protected] > > > > > > > > Note: please don't send private questions to me, as I don't have time > to provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them. > > > > > > > > > > > > > > > > > > > > -- > > > > Dianne Hackborn > > > > Android framework engineer > > > > [email protected] > > > > > > > > Note: please don't send private questions to me, as I don't have time > to provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them. > > > > > > > > > > > > -- > > > > You received this message because you are subscribed to the Google > > > > Groups "Android Developers" group. > > > > To post to this group, send email to > [email protected] > > > > To unsubscribe from this group, send email to > > > > [email protected] > > > > For more options, visit this group at > > > > http://groups.google.com/group/android-developers?hl=en > > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "Android Developers" group. > > > To post to this group, send email to > [email protected] > > > To unsubscribe from this group, send email to > > > [email protected] > > > For more options, visit this group at > > > http://groups.google.com/group/android-developers?hl=en > > > > > > > > > > > > -- > > > Dianne Hackborn > > > Android framework engineer > > > [email protected] > > > > > > Note: please don't send private questions to me, as I don't have time > to provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them. > > > > > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "Android Developers" group. > > > To post to this group, send email to > [email protected] > > > To unsubscribe from this group, send email to > > > [email protected] > > > For more options, visit this group at > > > http://groups.google.com/group/android-developers?hl=en > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group at > > http://groups.google.com/group/android-developers?hl=en > > > > > > > > -- > > Dianne Hackborn > > Android framework engineer > > [email protected] > > > > Note: please don't send private questions to me, as I don't have time to > provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them. > > > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group at > > http://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- Dianne Hackborn Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
