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Unwanted paging

By ryan ·
Have an NT4 SP5 server with 256Mb RAM.
Performance Monitor shows hard page faults running at >20/sec.
Task manager shows total physical memory of 256Mb, but Total Commit Charge is .5 to .75 of this.
So its not using all the physical memory beforepaging.
Maximize throughput for Network Applications is selected.
Seeing this effect on 3 separate machines

Anyone know if there is a setting that is inhibiting use of physical memory?
Am I interpreting the numbers incorrectly?
Or other ideas.

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Unwanted paging

by netmanFF In reply to Unwanted paging

a few questions first.
are you using a RAID 5?
did you upgrade to SP5 from SP4 or SP3?
is this an application server, if so, how many app's , how much traffic(you mentioned using Max. Throughput for NW App's)
Have you checked for memory leaks?
what do you see in the NT diagnostics Memory Tab?
Sorry for all the questioning but sometimes the info from the questions helps get a handle on things.
By the way, if you're server is working as both an app and file&print (or not exclusively an application server try balanced instead of maximize throughput for network applications.
this could take a few "replies" before solving.
If any one else can see into this delima right away please do so. in the mean time "ryan" keep posting with me there is always an answer.
(might not always be what we want to hear, but there is always an answer)

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Unwanted paging

by ryan In reply to Unwanted paging

The question was auto-closed by TechRepublic

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Unwanted paging

by ryan In reply to Unwanted paging

This is happening on a number of machines.
One is a production machine with Raid5 on the data disks(all SCSI),went from SP3->SP4->SP5, supports up to 40 concurrent users.
Application is Lotus Notes R4 with a 3rd party notes database application.
Users also use notes mail.
Another is a development machine with no RAID,(SCSI) SP5 installed first, supports <5 users
Application is same as above, no mail use.

No significant memory leaks found, and situation present after reboot.

Diagnostics/Memory on development server;
Physical Memory
Total 212152
Available 147640
File Cache 14700
Kernel Memory
Total 22312
Paged 16163
NonPaged 6144
Commit Change
Total 119764
Limit 523560
Peak 131740
Pagefile Space
Total 327680
Total in use 67412
Peak Use 73956
Total In Use Peak Use
c:\pagefile.sys 2048 1844 2040
d:\pagefile.sys 325632 65568 71916
c+d are separate physical disks

Thanks for the reply.

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Unwanted paging

by bill.parks In reply to Unwanted paging

This is tough, but here it goes. Conforming 32-bit apps such as Lotus Notes R4, use virtual or logical addressing and do not identify physical or "virtual" memory. Furthermore, NT allocates additional resources for each thread spawned, meaning for each thread you may use a 1mb stack. If Lotus is a serious multi-threaded app, overhead goes way up, while NT demands some room for itself. Complicate all this with the processes Lotus Notes maintains.
First off, tell NT what you want it to use. A well suggested start is the pagefile. Set Min and Max to twice the physical. NT now has a set allocation with a good ratio of physical/virtual.
Review some white papers on memory sizes. I know that Exchange 5.5 suggests 512 Mb for a server. I would imagine Lotus Noted is probably simliar. There are several services and processes that run behind the scenes that can choke an underpowered machine.
In review, your baselining shows normal pagefile operation. Remember, NT's VMM tries to handle allocation in the most optimum manner, Lotus may be requesting an allocation size not available by phyical memory and the VMM is returning a stack of virtual. This is normal, and by design.
The only real suggestion I have is to review the white papers for some RAM advice and adhere to them.

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Unwanted paging

by ryan In reply to Unwanted paging

The question was auto-closed by TechRepublic

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Unwanted paging

by ryan In reply to Unwanted paging

This question was auto closed due to inactivity

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