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dotnet performance : PAGE FAULTS - 800 000 in few minutes
Hello
I just noticed in TaskBar that my application generate lots of page faults... That seems to happend on paint event of my custom control. What could be the cause of it? I draw a full screen bitmap into my control That bitmap I create from multiple tiles...(the bitmap is a map) When I try to scroll the map around in a mouse move with right button down (as a drag), I get more and more page faults on every Me.Refresh call from within mousemove handler. -- Ceers, Crirus ------------------------------ If work were a good thing, the boss would take it all from you ------------------------------
No ideea?
-- Ceers, Crirus ------------------------------ If work were a good thing, the boss would take it all from you ------------------------------ [quoted text, click to view] "Crirus" <Crirus@datagroup.ro> wrote in message news:eY9EMQ1sDHA.2520@TK2MSFTNGP10.phx.gbl... > Hello > > I just noticed in TaskBar that my application generate lots of page > faults... > That seems to happend on paint event of my custom control. > > What could be the cause of it? > > I draw a full screen bitmap into my control > That bitmap I create from multiple tiles...(the bitmap is a map) > When I try to scroll the map around in a mouse move with right button down > (as a drag), I get more and more page faults on every Me.Refresh call from > within mousemove handler. > > > > -- > Ceers, > Crirus > > ------------------------------ > If work were a good thing, the boss would take it all from you > > ------------------------------ > >
What's the size of the bitmap? How big is the working set
(Mem Usage in task manager)? Does pfmon.exe show anything interesting? Are the pagefaults soft or hard? [quoted text, click to view] > "Crirus" wrote: > > Hello > > > > I just noticed in TaskBar that my application generate lots of page > > faults... > > That seems to happend on paint event of my custom control. > > > > What could be the cause of it? > > > > I draw a full screen bitmap into my control > > That bitmap I create from multiple tiles...(the bitmap is a map) > > When I try to scroll the map around in a mouse move with right button down > > (as a drag), I get more and more page faults on every Me.Refresh call from > > within mousemove handler.
Well, I'm not sure what pfmon is...and how to use it
[quoted text, click to view] > What's the size of the bitmap? The bitmap is full screan 1200x1024 or close[quoted text, click to view] > (Mem Usage in task manager)? Memory usage is around 25,000 K[quoted text, click to view] > Are the pagefaults soft or hard? How can I tell the difference?-- Ceers, Crirus ------------------------------ If work were a good thing, the boss would take it all from you ------------------------------ [quoted text, click to view] "Pavel Lebedinsky" <m_pll ./. hotmail ./. com> wrote in message news:%23unVnhhtDHA.2316@TK2MSFTNGP10.phx.gbl... > What's the size of the bitmap? How big is the working set > (Mem Usage in task manager)? Does pfmon.exe show anything interesting? > Are the pagefaults soft or hard? > > > "Crirus" wrote: > > > > Hello > > > > > > I just noticed in TaskBar that my application generate lots of page > > > faults... > > > That seems to happend on paint event of my custom control. > > > > > > What could be the cause of it? > > > > > > I draw a full screen bitmap into my control > > > That bitmap I create from multiple tiles...(the bitmap is a map) > > > When I try to scroll the map around in a mouse move with right button > down > > > (as a drag), I get more and more page faults on every Me.Refresh call > from > > > within mousemove handler. > >
[quoted text, click to view]
"Crirus" wrote: > Well, I'm not sure what pfmon is...and how to use it http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/tools/pfmon.asp [quoted text, click to view] > > What's the size of the bitmap? > The bitmap is full screan 1200x1024 or close > > > (Mem Usage in task manager)? > Memory usage is around 25,000 K > > > Are the pagefaults soft or hard? > How can I tell the difference? Pfmon has this info. Alternatively, you can look at Memory\Pages/sec perfmon counter. If it's near 0 then most of the pagefaults are soft (that is, resolved from memory instead of disk). It doesn't look like your working set is too large so the pagefaults are probably not caused by excessive memory usage (what's the Available physical memory as reported by Task Manager by the way?). My guess is that some code repeatedly allocates and frees chunks of memory using VirtualAlloc, or something like that. Soft pagefaults are relatively cheap so if you don't see an obvious performance impact you might want to just ignore them.
I have a pfmon log can you watch it and ell me if there is something I
should worry about there? http://ticera.i-tech.ro/crirus/pfmon.log -- Ceers, Crirus ------------------------------ If work were a good thing, the boss would take it all from you ------------------------------ [quoted text, click to view] "Pavel Lebedinsky" <m_pll ./. hotmail ./. com> wrote in message news:el9xzVEuDHA.3256@TK2MSFTNGP11.phx.gbl... > "Crirus" wrote: > > > Well, I'm not sure what pfmon is...and how to use it > > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/tools/pfmon.asp > > > > What's the size of the bitmap? > > The bitmap is full screan 1200x1024 or close > > > > > (Mem Usage in task manager)? > > Memory usage is around 25,000 K > > > > > Are the pagefaults soft or hard? > > How can I tell the difference? > > Pfmon has this info. Alternatively, you can look at Memory\Pages/sec > perfmon counter. If it's near 0 then most of the pagefaults are soft > (that is, resolved from memory instead of disk). > > It doesn't look like your working set is too large so the pagefaults are > probably not caused by excessive memory usage (what's the Available > physical memory as reported by Task Manager by the way?). > > My guess is that some code repeatedly allocates and frees chunks > of memory using VirtualAlloc, or something like that. Soft pagefaults > are relatively cheap so if you don't see an obvious performance > impact you might want to just ignore them. > >
Hi Crirus,
I think that AQtime .NET could help you determine the cause of the problem. It allows you to measure different characteristics of an application's functioning, such as Hard Memory Page Faults, Soft Memory Page Faults and All Memory Page Faults. You can find more details in the 'Performance Profiler - Overview' topic of AQtime .NET help system. The fully-functional 30-day trial version can be downloaded from our web site: http://www.automatedqa.com/downloads/aqnet.asp Regards, Bobby Edgar AutomatedQA ================================ [quoted text, click to view] Crirus wrote: Hello>> I just noticed in TaskBar that my application generate lots of page faults... That seems to happend on paint event of my custom control. What could be the cause of it? I draw a full screen bitmap into my control That bitmap I create from multiple tiles...(the bitmap is a map) When I try to scroll the map around in a mouse move with right button down (as a drag), I get more and more page faults on every Me.Refresh call from within mousemove handler. -- Ceers, Crirus ------------------------------ If work were a good thing, the boss would take it all from you ------------------------------ <<
You don't have good symbols so it's difficult to get any useful
information from the log except for the fact that most pagefaults are soft and are caused by gdiplus functions. I wouldn't worry too much about this. Escpecially if you don't see any perf problems in your app, and you're not doing anything obviously bad like repainting the window on each mouse move. If you're really interested, you can fix symbols (http://www.microsoft.com/whdc/ddk/debugging/default.mspx), find out which function in gdiplus is causing the pagefaults, disassemble it to see what it is doing, put a breakpoint to see who the caller is etc. [quoted text, click to view] "Crirus" wrote: > I have a pfmon log can you watch it and ell me if there is something I > should worry about there? > > http://ticera.i-tech.ro/crirus/pfmon.log > > -- > Ceers, > Crirus > > ------------------------------ > If work were a good thing, the boss would take it all from you > > ------------------------------ > > "Pavel Lebedinsky" <m_pll ./. hotmail ./. com> wrote in message > news:el9xzVEuDHA.3256@TK2MSFTNGP11.phx.gbl... > > "Crirus" wrote: > > > > > Well, I'm not sure what pfmon is...and how to use it > > > > > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tools/tools/pfmon.asp > > > > > > What's the size of the bitmap? > > > The bitmap is full screan 1200x1024 or close > > > > > > > (Mem Usage in task manager)? > > > Memory usage is around 25,000 K > > > > > > > Are the pagefaults soft or hard? > > > How can I tell the difference? > > > > Pfmon has this info. Alternatively, you can look at Memory\Pages/sec > > perfmon counter. If it's near 0 then most of the pagefaults are soft > > (that is, resolved from memory instead of disk). > > > > It doesn't look like your working set is too large so the pagefaults are > > probably not caused by excessive memory usage (what's the Available > > physical memory as reported by Task Manager by the way?). > > > > My guess is that some code repeatedly allocates and frees chunks > > of memory using VirtualAlloc, or something like that. Soft pagefaults > > are relatively cheap so if you don't see an obvious performance > > impact you might want to just ignore them.
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