|go ahead... be a heretic|
Re^2: What could cause excessive page faults?by BrowserUk (Pope)
|on Mar 11, 2010 at 09:03 UTC||Need Help??|
There is no swapping involved. I have 4GB of ram and well over 2 of that was available at the point the scripts achieved maximum usage.
Page faults can also occur due to Windows 2-stage virtual memory allocation schema. Virtual memory can be 'reserved' by a process, without being 'commited'. Reservation means that space is reserved within the process address space and page tables within the OS internal structures, but no actual physical memory is yet assigned to back that reservation up. When access is first attempted to a 'reserved' page of virtual memory, a page fault occurs. and the page (or many) must be 'commited' before the memory access completes.
The way this normally works is, in the executable header, there are 2 values that are used to reserve stack and heap spaces for the process when it it loaded. There are 2 other values which define how much of the reservation gets committed each time a reserved page pagefault occurs:
Note. The above values are non-standard as I have changed them in an attempt to track this down. The problem is, the above settings have no affect upon the outcome.
I think I've tracked the problem to <perlsources>\win32\vmem.h. Specifically,
And I think this in the makefile is a contributary factor:
No proof yet. (I'm on my 3rd perl build; and geez they take a long time!) Just gut feel at this point. What I can say is that the problem still manifests itself when Perl and all its libraries are built with the same compiler (use the same CRT). And that using PERL_MALLOC doesn't change the situation.
However I get very similar results with a 32 bit Windows system and 5.10.1 btw.
Thanks for that. I don't suppose you have a AS 5.8.something install kicking around that you could try this on?
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