400MB works much better as a threshold on my M10 indeed. However I’m seeing something fishy: whenever the browser unloads a background tab to free up some memory, a small amount of memory is indeed reclaimed (usually less than 100MB), but the browser process continues to use up a lot of memory. When browsing pictures on 500px.com, eventually all other tabs get unloaded, and the only renderer process left active is consuming around 10% memory, but the browser process is consuming up to 30% memory. After a while left idle, it goes down to < 10%, which indicates that a lot of memory has been reclaimed at once (late garbage collection maybe?), which alleviates significantly the memory pressure.
My wild guess is that the memory used by the unloaded tabs is not garbage-collected by the QML engine right away when the tabs are unloaded. This seems to be confirmed by adding an explicit call to gc() in the unload() function of BrowserTab: unloading a tab now seems to reclaim a much larger chunk of memory, and the memory used by the browser process remains under control. -- 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: In Progress Status in webbrowser-app package in Ubuntu: In Progress 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
