Browsing articles tagged with "virtualmemory - Admins Goodies"
Nov 20, 2012
tom

100GB Virtual Memory on 64GB server without swap [closed]

Possible Duplicate: Understanding virtual memory usage > swap + physical on Linux We have the following process: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 10684 root 8 -15 89.6g 13g 1.1g S 406.9 21.8 316:34.89 java Is this amount of virtual memory ok, assuming the fact that we have only 64GB of RAM. Also here is the info about the physical memory: Mem: 65995412k total, 64967388k used, 1028024k free, 3976288k […]

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Jun 29, 2012
tom

Memory overcommitment on VmWare ESXi 5.0

I would like to understand better the possibilities of VmWare ESXi memory overcommitment. I’ve read this paper from VmWare, so I am familiar with general concepts, such as hypervisor swapping, memory balooning and page sharing. It seems that a combination of these techniques allows for quite a large degree of overcommitment. However, I am not sure. I am deploying a virtual test lab comprising of 4 identical sets of virtual servers and workstations and a […]

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Mar 20, 2012
tom

How to sort top result on virtual memory on Redhat Linux?

There is an interactive key “M” to sort by memory, which seems to be sorting on resident memory. Is there a way to sort on virtual memory? I happen to be working on Redhat Linux, but the question is not specific to this distribution. Asked by timeon You get a list of things you can sort by by pressing O. Virtual segment size is option o, so you can get what you want by pressing […]

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Mar 13, 2012
tom

Understanding virtual memory usage > swap + physical on Linux

I have a process that is reporting in ‘top’ that it has 6GB of resident memory and 70GB of virtual memory allocated. The strange thing is that this particular server only has 8GB physical and 35GB of swap space available. From the ‘top’ manual: o: VIRT — Virtual Image (kb) The total amount of virtual memory used by the task. It includes all code, data and shared libraries plus pages that have been swapped out. […]

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Jan 21, 2012
tom

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 the problem. New machine: 132 prod-Charlotte1-node1 ~/public_html/rearch/cgi-bin> ps aux | grep ps root 293 0.0 0.0 0 0 ? S< May09 0:00 [kpsmoused] xamine 2267 1.0 0.0 63728 928 pts/3 R+ 16:50 0:00 ps aux xamine 2268 […]

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Dec 15, 2011
tom

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 production machine. From what I understand, it has AWE enabled with a maximum memory limit of 6041 MB. I never heard of AWE, but I thought this was a little suspicious and suspected thrashing was the reason the […]

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Aug 24, 2011
tom

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). As I understand it, Buffers Are used by programs with active I/O operations, i.e. data waiting to be written to disk Cache Is the result of completed I/O operations, i.e. buffers that have been flushed or data read from disk […]

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Aug 20, 2011
tom

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

I just want to know that my server shows total used free shared buffers cached Mem: 12286456 11715372 571084 0 81912 6545228 -/+ buffers/cache: 5088232 7198224 Swap: 24571408 54528 24516880 What does it means? I have no idea on calculating the memory in linux. I think it says that 5088232 is used where as 7198224 is free, means it is actually consuming 5GB of ram. Thank You The display columns mean: total: Your total (physical) […]

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Aug 20, 2011
tom

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 workload in one hour. Recently, I’ve seen bad performance and am in the process of diagnosing and excluding various considerations. We are running Red Hat Enterprise Linux Server release 5.3 (Tikanga) on vmware ESX. The physical server I’m focussing on runs and […]

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Aug 20, 2011
tom

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 and over 100M of physical memory. What could be causing such extreme usages of memory. Also, I’ve heard there was Norton problems with mad.exe, but we do not have Norton installed on the server. Also, this server is […]

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