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 <jack.harv...@gmail.com> 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 <jack.harv...@gmail.com> > > 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 <hack...@android.com> > > > wrote: > > > A few. Why? :) > > > > > > > > > On Wed, Aug 31, 2011 at 10:40 AM, Jack Harvard <jack.harv...@gmail.com> > > > 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 android-developers@googlegroups.com > > > To unsubscribe from this group, send email to > > > android-developers+unsubscr...@googlegroups.com > > > For more options, visit this group at > > > http://groups.google.com/group/android-developers?hl=en > > > > > > > > > > > > -- > > > Dianne Hackborn > > > Android framework engineer > > > hack...@android.com > > > > > > 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 > > > hack...@android.com > > > > > > 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 android-developers@googlegroups.com > > > To unsubscribe from this group, send email to > > > android-developers+unsubscr...@googlegroups.com > > > 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 android-developers@googlegroups.com > > To unsubscribe from this group, send email to > > android-developers+unsubscr...@googlegroups.com > > For more options, visit this group at > > http://groups.google.com/group/android-developers?hl=en > > > > > > > > -- > > Dianne Hackborn > > Android framework engineer > > hack...@android.com > > > > 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 android-developers@googlegroups.com > > To unsubscribe from this group, send email to > > android-developers+unsubscr...@googlegroups.com > > 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 android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > > > > -- > Dianne Hackborn > Android framework engineer > hack...@android.com > > 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 android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com > 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 android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
