Good to know -- thanks! On Thu, Oct 27, 2011 at 12:40 PM, Dianne Hackborn <[email protected]> wrote: > There are a lot of other performance reasons for the .dex format that I > didn't see in your article. For example, in Java byte code each class is in > its own file inside of the zip. In Dalvik, they are all in one .dex file. > This makes it a lot faster to start the app (all code is loaded at once), > and greatly reduces the overall size because it can do things like pool all > strings together. > Also the dex format is designed to be very easy to turn into the final .odex > file -- this the result of doing the final link of the .dex against the > platform it is running on. And the .odex file (and thus dex file) is > designed so that to load it you can just mmap it. Using mmap greatly > reduces memory pressure because the kernel can freely map and unmap pages as > it wants (and remember we don't use a swap file so if the code is loaded > into an allocation it can never be paged out of RAM). > > On Thu, Oct 27, 2011 at 3:09 AM, Mark Murphy <[email protected]> > wrote: >> >> http://commonsware.com/blog/Articles/what-is-dalvik.html >> >> On Thu, Oct 27, 2011 at 6:06 AM, bob <[email protected]> wrote: >> > What is the point of putting stuff in this weird Dalvik format? Why >> > not use Java bytecode? >> > >> > -- >> > 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 >> > >> >> >> >> -- >> Mark Murphy (a Commons Guy) >> http://commonsware.com | http://github.com/commonsguy >> http://commonsware.com/blog | http://twitter.com/commonsguy >> >> Android Training in NYC: http://marakana.com/training/android/ >> >> -- >> 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
-- Mark Murphy (a Commons Guy) http://commonsware.com | http://github.com/commonsguy http://commonsware.com/blog | http://twitter.com/commonsguy _Android Programming Tutorials_ Version 4.0 Available! -- 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
