[webkit-help] Memory usage is up 60%

Luc R. wkdev911 at gmail.com
Wed May 7 12:36:01 PDT 2014

Thanks Benjamin. Do I understand right that the MemoryPressureHandler is an
additional mechanism to reduce memory on top of other things, but is not
the root cause of memory increase at first place?

An extra  information on memory pattern:
For the new code, amount of committed memory is actually less for about 2x
on average (say 150M vs 300M per process), but private memory is higher say
100M vs 60M per process, as well as is the working set. The scenario is a
continuous processing a URL list until process crashing. My interpretation
that somehow processes burn more physical memory, instead of letting it
page out to disk. Does it make sense?

This looks like a dramatic change. Are there any major changes in memory
management in the last 2 years? Are there any sensitive settings which can
be tuned up?

On Mon, May 5, 2014 at 6:38 PM, Benjamin Poulain <benjamin at webkit.org>wrote:

> On 5/5/14, 6:31 PM, Luc R. wrote:
>> Question on memory usage.
>> I am using WinCairo port, and I have recently updated the codebase from
>> about 2 years old one. I am running an automation with multiple
>> instances of WebKit running in parallel, and each instance is processing
>> a list of URLs (until crashes, then it's restarted).
>> I noticed that memory usage on the new codebase is about 60% higher! I
>> don't see substantial differences in the output (which is pretty much
>> outerHTML) and processing speed is about the same.
>> Does anyone have ideas, which feature could have added such a
>> significant increase of memory usage? I would be interested to look into
>> details of how to reduce that back to normal.
> WebKit is becoming a lot better at using memory efficiently to improve the
> runtime performance. It could simply be better use of the ram.
> You should try to wiring the MemoryPressureHandler with your system, and
> see if that makes a difference.
> Benjamin
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> webkit-help mailing list
> webkit-help at lists.webkit.org
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