.Help with measuring working-set
hi, I am developer of Mozilla (open source web browser from mozilla.org) We are trying to make footprint improvements to the browser and have settled on minimizing working set and max-vm-usage as our goals.
http://www.mozilla.org/projects/footprint/footprint-guide.html
One thing we are struggling with is measurement of working set of app during a time interval.
Any pointers ? Are the metrics the best ones to measure and optimize ?
This is my first post to this mailing list; deeply sorry if this question is outside the agenda of this group.
dp
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Quoted 8 lines · Suresh Duddi
hi, I am developer of Mozilla (open source web browser from mozilla.org) We are trying to make footprint improvements to the browser and have settled on minimizing working set and max-vm-usage as our goals.
http://www.mozilla.org/projects/footprint/footprint-guide.html
One thing we are struggling with is measurement of working set of app during a time interval.
The only metric the kernel supports for the working set currently is a single RSS integer telling you have many pages are currently mapped into a process. There may be more pages from your process unmapped in RAM, but being unmapped is usually the first step to swap the page out or throw it away.
Quoted 1 line
Any pointers ? Are the metrics the best ones to measure and optimize ?
I guess you would prefer to know which pages are mapped at a given point. This would require some custom patching to add a trace facility for that. Shouldn't be that hard to implement, but I don't know of a ready patch.
-Andi
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Quoted 6 lines · Andi Kleen
Quoted 1 line
Any pointers ? Are the metrics the best ones to measure and optimize ?
I guess you would prefer to know which pages are mapped at a given point. This would require some custom patching to add a trace facility for that. Shouldn't be that hard to implement, but I don't know of a ready patch.
mincore(2) perhaps?
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Quoted 7 lines · Andi Kleen
Quoted 4 lines · Suresh Duddi
http://www.mozilla.org/projects/footprint/footprint-guide.html
One thing we are struggling with is measurement of working set of app during a time interval.
Quoted 6 lines
Quoted 1 line
Any pointers ? Are the metrics the best ones to measure and optimize ?
I guess you would prefer to know which pages are mapped at a given point. This would require some custom patching to add a trace facility for that. Shouldn't be that hard to implement, but I don't know of a ready patch.
I think Mike Shaver (you know him) has made a kernel patch to measure exacty this, also for Mozilla development.
You should be able to just use his patch, if he still has it.
regards,
Rik
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