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Full Discussion: Page Fault + Memory
Top Forums UNIX for Dummies Questions & Answers Page Fault + Memory Post 302527383 by waseem on Friday 3rd of June 2011 07:51:36 AM
Old 06-03-2011
Page Fault + Memory

I am not sure where to post this so i will put it in the newbie section.

I have set up a bog standard debain 6, LAMP environment in the cloud.

The specs

1 core at 2GH
2.5gb Memory

running Jommla, with about 1.6K visitors a day.

I am using AppFirst (appfirst.com) to monitor the server, and I am getting memory usage over 956M alerts almost every hour (not at the same time)

I have had a look at their monitoring tools and I can see the following.

1. At the times of the alerts the Page Faults go up very high.

2. The number of process goes up really high (i assume this is what is causing the page faults).

3. Most of the page faults are associated with apache.

I intialy thought it was the database , as joomla is bit database heavy sometimes.

However I am not sure now and I need some pointers.

I have no swap space defined on the disk, I totally forgot about this when setting it up.

Any kind of help would be good, the memory spikes may have nothing to do with the page faults but I think it does.
 

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pfm_enable_faults(3ncs) 												   pfm_enable_faults(3ncs)

Name
       pfm_enable_faults - enable asynchronous faults

Syntax
       #include <idl/c/base.h>
       #include <idl/c/pfm.h>

       void pfm_$enable_faults()

Description
       The routine enables asynchronous faults after they have been inhibited by a call to causes the operating system to pass asynchronous faults
       on to the calling process.

       While faults are inhibited, the operating system holds at most one asynchronous fault.  Consequently, when returns, there can  be  at  most
       one  fault waiting on the process.  If more than one fault was received between routines to and the process receives the first asynchronous
       fault received while faults were inhibited.

Diagnostics
       This section lists the status codes for errors returned by this routine.

       pfm_$bad_rls_order  Attempted to release a clean-up handler out of order.

       pfm_$cleanup_not_found
			   There is no pending clean-up handler.

       pfm_$cleanup_set    A clean-up handler was established successfully.

       pfm_$cleanup_set_signalled
			   Attempted to use pfm_$cleanup_set as a signal.

       pfm_$invalid_cleanup_rec
			   Passed an invalid clean-up record to a routine.

       pfm_$no_space	   Cannot allocate storage for a clean-up handler.

Files
See Also
       intro(3ncs), pfm_enable(3ncs), pfm_inhibit_faults(3ncs)

															   pfm_enable_faults(3ncs)
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