On Apr 1, 5:13 am, Venkatarangan MJ <[email protected]> wrote: > The ouput fields are not exactly the same as the standard linux fields. > Therefore I am not clear on the significance of VSS and RSS. Can some one > explain on how to interpret these fields?
Virtual Set Size (sometimes abbreviated VSZ) and Resident Set Size. Googling will turn up some detailed info for Linux. Here's the high speed version: VSS indicates how much virtual memory is associated with the process, Resident Set Size indicates how many physical pages are associated with the process. VSS is generally meaningless on Android. If I memory-map a 1MB file, VSS grows by 1MB, but I haven't used any resources (other than entries in a virtual mapping table). RSS is partially meaningless on Android, because it doesn't identify pages shared between multiple processes. If process A has an RSS of 2MB, and process B has an RSS of 2MB, it's possible that there are 4MB of physical pages occupied. It's also possible that there are only 2MB of physical pages occupied. There's a "procrank" tool available on engineering builds that adds two new values: PSS and USS. USS is the count of pages that are unique to that process. PSS is RSS reduced by a percentage according to how many processes share the physical pages. For example, if there are three processes sharing the same 6MB region, each process will adjust their RSS count by 6MB, but only add 2MB to their PSS. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Beginners" 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-beginners?hl=en -~----------~----~----~----~------~----~------~--~---
