[webkit-help] Memory useage inconsistent on iPhone between device log and Activity Monitor

[tenghu guo]

Hi
I am debugging an app on an iOS device that renders an email using
WKWebview. The webview terminates for a given email so I want to find the
root case.

I got the device log from the Console app on my Mac. The log is saying that
the WebContent Process costs more than 1500MB memory so the system killed
it.

default 08:34:32.855474+0800    kernel  EXC_RESOURCE ->
com.apple.WebKit.WebContent[9204] exceeded mem limit: ActiveSoft 1536
MB (non-fatal)

default 08:34:32.859688+0800    kernel  36050.843 memorystatus:
killing_highwater_process pid 9204 [com.apple.WebKit.WebContent]
(highwater 10) 1574608KB - memorystatus_available_pages: 46487
compressor_size:42976

default 08:34:32.897449+0800    osanalyticshelper   Process
com.apple.WebKit.WebContent [9204] killed by jetsam reason highwater


But the Activity Monitor in Instrument tells me that the WebContent process
cost less than 200MB memory.
Which should I trust?

I also run the same app in an iOS simulator. The simulator won't crash
since there is a lot of memory for a Mac. The log says that the WebContent
process cost less than 200 MB memory as well.

default *15:22:03.064321*+0800 com.apple.WebKit.WebContent.Development
0x4493a3190 - PerformanceMonitor::measurePostLoadMemoryUsage: Process was
using 166961152 bytes of memory after the page load.


Why these reports not consistent?
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