I did some extensive stress-testing on an M10, an MX4 and a E4.5, all running the latest rc-proposed image. I launched a number of applications (some native, some webapps) in the background, and then opened a number of tabs in the browser app (with the mechanism to unload tabs temporarily disabled).
I observed that even when under quite some pressure (with more than 10 tabs open and active, including memory-hungry apps like google plus, hangouts, google docs, google maps, twitter, facebook), the free memory (MemFree+Buffers+Cached) rarely seems to go below 200MB (more often on the E4.5 than on the other two devices, which is expected because the E4.5 has 1GB RAM whereas the other two have 2GB RAM). I had to push the limits quite a bit to get the system OOM killer to kick in, and it never killed the browser app, always a background app. Those numbers and observations seem to indicate that an arbitrary threshold of 200MB should work reasonably well, instead of a percentage of the available memory. I’ll experiment further with that value. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to webbrowser-app in Ubuntu. https://bugs.launchpad.net/bugs/1576639 Title: memory threshold is too high Status in Canonical Device Images: New Status in Canonical System Image: Confirmed Status in webbrowser-app package in Ubuntu: Confirmed Bug description: When opening new tabs in the browser, it decides if it should close existing ones based on level of free memory available in the system. My understanding is that this is currenly set to 30% percentage of memory in the device. There are two issues with this approach and setting: 1) a percentage means that the threshold changes from device to device. While theamount of memory needed to open a webpage is not device specific. For example at 30%, the browser would close open tabs if there less than 1.2Gb mem free in a 4Gb device, but will only need 300Mb free on a 1Gb device. This is a very large difference. 2) In M10 with 2Gb it requires 600mb free. From idle, just opening the gmail in the browser, takes the avilable system memory below this. This means that in 2gb devices the threshold is never met, and the browser never runs more than one tab at the same time. this impacts user experience, specially in desktop mode. For example is not possible to open a document in the browser while attending a hangout. How to reproduce open a tab in the browser, go to youtube and play any video then open a new tab expected: music/sound in the video continues to play actual in m10: sound stops playing shortly after opening the tab To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-device-images/+bug/1576639/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
