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Old 05-18-2014, 05:05 PM   #1
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Default Page Faults

Hi Guys,

Just starting off very vague (because i know very little at the moment).
In general what causes a large number of Page Faults?

I have an app designed to run 24 hours a day 7 days a week that has racked up an enormous number of page faults 754,236,758 top be precise?

What would be the cause of this?
Or appreciating that is diffcicult to tell, what is the cause of a page fault in general?
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Old 05-21-2014, 08:42 AM   #2
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Default Re: Page Faults

Quote:
Issue: Memory page faults
Counters to Track: Memory\Page Faults/sec; Memory\Pages Input/sec; Memory\Page Reads/sec
Details: A page fault occurs when a process requests a page in memory and the system canít find it at the requested location. If the requested page is elsewhere in memory, the fault is called a soft page fault. If the requested page must be retrieved from disk, the fault is called a hard page fault. Most processors can handle large numbers of soft faults. Hard faults, however, can cause significant delays. Page Faults/sec is the overall rate at which the processor handles all types of page faults. Pages Input/sec is the total number of pages read from disk to resolve hard page faults. Page Reads/sec is the total disk reads needed to resolve hard page faults. Pages Input/sec will be greater than or equal to Page Reads/sec and can give you a good idea of your hard page fault rate. A high number of hard page faults may indicate that you need to increase the amount of memory or reduce the cache size on the server.
See more here Uncover Memory-Related Bottlenecks

---------- Post added at 10:42 PM ---------- Previous post was at 10:41 PM ----------

Also check your running processes and startup services to see if anything unusual is occurring there.
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Old 05-21-2014, 02:46 PM   #3
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Default Re: Page Faults

It could be the data it's looking for has got pushed out of ram on to the hard drive and it's having to go look for it. How much ram do you have?
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