It is an extension of memory address space which is logically appended to the physical memory of a computer by the Memory Management Unit (MMU) of its processor. It is normally realized in operating systems by utilizing free disk space to implement such memory extension and may also be referred to ...

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1answer
925 views

How to use AWE for Windows Server 2003 (32-bit) and SQL Server 2005 (32-bit)?

The server is Windows Server 2003 SP2 (32-bit), running SQL Server 2005 SP3 (32-bit). I believe the server has 4 GB of physical RAM. The machine has crashed twice in the last week and it is a ...
2
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1answer
227 views

Windows Server: Prevent process swapping/paging

Is there a possibility to prevent swapping for a single process? This process is an in-memory-database and should not be moved to virtual ram. all other processes should still be swap-able. I ...
1
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1answer
113 views

How to Examine Virtual Memory Fragmentation on Windows 2000?

Is there a method to examine the virtual address space of a specific process to examine if that process is under going virtual memory fragmentation? I know it sounds like something I shouldn't be ...
0
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1answer
536 views

Memory per user on AIX

nmon is showing me 99% memory usage and swap activity. My user is not very active at the moment so it should be someone elses fault. Is there a way I figure how much memory each user is taking? Must ...
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3answers
15k views

How do I tell what process is causing kswapd to be in use?

I see kswapd using 100% CPU... how can I tell on which process's behalf kswapd is being used so much?
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vote
1answer
258 views

OOMKiller causing machine hosting Java to become unresponsive

I have two servers running in a private vSphere cloud, both running JBoss and Tomcat. Machine 8 - RHEL5.3, 3 gigs of 'physical' memory, 1 gig of swap Machine 25 - RHEL4.6, 2 gigs of 'physical' ...
3
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1answer
621 views

Reducing Virtual memory Page File Size on Windows 7

I've upgraded my PC to 16GB RAM and I've noticed the page file is at 16GB as well. Since I decided to go SSD, hard drive space is a bit limited so I would like to try and claim some of that 16GB back. ...
11
votes
2answers
9k views

What is “a lot” of Page Faults?

I am monitoring the memory object in Windows 2k8, and am tracking the Page Faults/sec counter. Is there any threshold to determining what is an excessive amount of page faults? Or should I be more ...
3
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2answers
614 views

Linux OOM disk I/O. Also: swap, what is it good for?

I'm having problems with the OOM killer on one of my Linux (2.6.37) installs. The computer has 4GB of memory which I sometimes utilize fully. In those cases, I expect the OOM handler to come in and ...
2
votes
1answer
261 views

Do IIS App Pools using Network Service account share memory?

We're trying to tune our IIS farm, and I'm trying to get my head around how Windows allocates resources in our current setup. We have a pretty standard layout. We host 30+ ASP/ASP.NET sites on our ...
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2answers
423 views

What is excessive swapping?

The following excerpt from this post led me to this question: Cache contention On a large site, if you are using MyISAM, contention occurs in the database tables when the cache is ...
3
votes
1answer
493 views

Performance affects of compressing Program Files on Windows / NTFS

What are the performance affects of compressing Program Files on Windows NTFS? On a fast, multicore machine, the overhead of decompression is minimal. Machines are generally disk bound, and if you ...
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2answers
602 views

Cherokee high virtual memory usage even after disabling I/O Cache

I've Ubuntu 10.04LTS 64-bit running on a openvz container and Cherokee 1.0.8 compiled from source. The virtual memory usage of cherokee-worker is around 430 MB even after disabling I/O cache from ...
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2answers
762 views

Ubuntu virtual memory caches suck up memory

I've got an Ubuntu 9.10 64-bit server that seems to use up all available memory. According to my munin graphs, almost all of the memory used up is in the swap cache, cache, and slab cache. (I take ...
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2answers
947 views

How much hard drive space should I allocate to Virtual Memory? [duplicate]

Possible Duplicate: how big should be the swap partition? Back in the day the rule of thumb was "2.5 x Amount of RAM" = amount of virtual memory you need. So if you have 500MB of RAM you ...
4
votes
1answer
7k views

How to limit the memory used by an application in IIS?

The IIS worker processes are taking lot of memory on our servers. I want to limit the memory each application can use. I am confused whether I should set a limit on Virtual Memory Limit, or Private ...
9
votes
1answer
3k views

Difference Between Private Memory Limit and Virtual Memory Limit in IIS

I want to set the max limit on the physical memory an application can use in IIS 7. Should I set a limit on Private Memory Limit or Virtual Memory Limit? Can some one point me to documentation of all ...
1
vote
1answer
797 views

Virtual Memory Limit in IIS 7

The Virtual Memory Limit(KB) setting in IIS 7 on our production server has a value 0. Does it means our application is not using any virtual memory or does it means, there is no maximum limit on the ...
0
votes
1answer
176 views

SQL Server 2005 Lock Pages in Memory on 32-bit system

On a 32-bit Windows Server 2003 Standard Edition SP2, I'm debating the pros and cons of /3gb + AWE + Locked Pages for SQL Server 2005 Standard SP3 CU4. The system only has 4GB of physical memory, ...
1
vote
1answer
591 views

Virtual Memory limit, 60 second recycle in IIS6

I have been required to set the Maximum virtual memory (in megabytes) setting in IIS6 on and it has been enabled with the default value of 500 MB. There has been an issue, since then, of the ...
0
votes
2answers
419 views

New 64 bit linux system has regular processes (ps, grep etc) taking up way too much VIRT mem

We just moved from a 32-bit machine to a 64-bit machine. We have quickly ran out of memory despite the new boxes have twice as much ram as the old boxes. Running a simple ps command will illustrate ...
1
vote
1answer
730 views

Why do I get swap space related errors when I still have lots of free memory in Solaris 10?

I am seeing a few of my services suffering/crashing with errors along the lines of "Error allocating memory" or "Can't create new process" etc. I'm slightly confused by this since logs show that at ...
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votes
3answers
3k views

Windows Server task manager displays much higher memory use than sum of all processes' working set size

I have a 16 GB Windows Server 2008 x64 machine mostly running SQL Server 2008. The free memory as seen in Task Manager is very low (128 MB at the moment), i.e. about 15.7 GB are used. So far, so good. ...
0
votes
1answer
472 views

Total Virtual Memory in Windows XP 32bit

I am running Windows XP 32bit. I have a total of 3GB memory installed and I also increased the Virtual memory to 4GB (Properties --> Advanced --> Performance Settings --> Advanced --> Virtual Memory ...
7
votes
4answers
435 views

What are the exact conditions based on which Linux swaps process(s) memory from RAM to a swap file?

My server has 8Gigs of RAM and 8Gigs configured for swap file. I have memory intensive apps running. These apps have peak loads during which we find swap usage increase. Approximately 1 GIG of swap is ...
5
votes
4answers
5k views

Constantly Increasing swap size in Linux and Swap space not being reclaimed?

I have a 8GB RAM linux box on which 4 tomcat servers are running. One of the them is set to 3000MB memory(jvm -Xms and -Xmx setting) and others are set to 1500MB. The swap partition is also set to ...
1
vote
2answers
413 views

How to check use of userva boot option on Win 2K3 server

I have some 32-bit Win2K3 servers running an application that fails now and then apparently due to heap fragmentation. (Process virtual bytes grows, private bytes does not) I do not have access to ...
0
votes
2answers
518 views

Extremely high memory usage for mad.exe on Server 2003

Hello I am running a Server 2003 server. I keep getting error messages saying to "increase page file size" When I looked in task manager for culprits I got mad.exe is using over 1G of virtual memory ...
2
votes
1answer
3k views

Definition of these metrics recorded in /proc/vmstat on RHEL 5.3 (paging/swapping?)

This question relates to the definition of specific metrics recorded in /proc/vmstat on RHEL 5.3. I'm using nmon to monitor a load test which consists of simulating 2500 users carrying out a days ...
48
votes
3answers
41k views

Meaning of the buffers/cache line in the output of free

Why does my server show total used free shared buffers cached Mem: 12286456 11715372 571084 0 81912 6545228 -/+ buffers/cache: 5088232 7198224 ...
2
votes
2answers
710 views

DefaultAppPool Settings in IIS

With a 4Gb RAM server and Windows 2003, I've determined by trial and error that setting a virtual RAM limit of 1.6 seems to kill the runaway processes without causing the normal processes to restart ...
21
votes
18answers
21k views

Caching/preloading files on Linux into RAM

I have a rather old server that has 4GB of RAM and it is pretty much serving the same files all day, but it is doing so from the hard drive while 3GBs of RAM are "free". Anyone who has ever tried ...
1
vote
4answers
2k views

How do I tell if a Linux system has hugemem?

i386 Linux kernels can be configured for a 2, 3 or 4 GiB limit on virtual address space per process, AFAIK. Is there something I can query in /proc or elsewhere to tell how the currently-running ...
21
votes
5answers
15k views

swap partition vs file for performance?

What is better for performance? A partition closer to the inside of the disk will have slower access times, and we must wait for the drive to switch between the OS and swap partitions. On the other ...
35
votes
3answers
19k views

In Linux, what is the difference between “buffers” and “cache” reported by the free command?

This is an old question that I've seen from time to time. My understanding of it is rather limited (having read about the differences a long time ago, but the factoid(s) involved never really stuck). ...