The virtual-memory tag has no wiki summary.
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2answers
42 views
Impact on various Linux commands on a Varnish server
I know Varnish use memory mapped technique for caching data in memory, what if I execute the following commands on a machine, are there any penalty on the overall Varnish's performance?
e.g.
Total ...
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3answers
126 views
Is this server using too much RAM or virtual memory ? (screen attached) [closed]
I have a VPS with 512MB of ram 40GB storage 1CPU, I run a small domain parking service on it.
It is on CentOS, MySQL, Apache, etc.
Now my hosting provider claims that my server is putting too much ...
3
votes
3answers
73 views
Virtual Server Memory not a power/multiple of 2
In the old times (before virtualization), memory came in powers/multiples of 2, because that is the way memory is manufactured. Nowadays that we create virtual servers that don't have real physical ...
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0answers
50 views
How to tune system settings for mongoDB on Linux?
Trying to squeeze a lot out of one question here -- please bear with me.
Although the MongoDB man pages make several useful recommendations about system settings like ulimit ...
1
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1answer
67 views
Using Linux /proc/meminfo to avoid overloading server via swapping
I am trying to find a metric to use that will tell me if starting another process estimated to use N bytes of memory will have an adverse impact on system performance.
I know that the /proc/meminfo ...
1
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1answer
53 views
Is it bad if your Virtual Bytes count is high in an application pool in IIS?
Related to What does Virtual Bytes mean in Worker Processes pane in IIS7.5 Manager?
I have a server running a few different sites. We're seeing some performance and memory issues.
When I go to ...
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2answers
58 views
virtual memory optimization on exchange server 2010
Hi I did some Google searching but came up blank
I know mycomputer/computer > Properties > advance System settings > Advance[tab] > Settings[Performance] > Advance [Tab] > Change > customsige
...
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1answer
146 views
How to find out who used all RAM (UPDATED)?
Sometimes I find that 100% of my small Debian machine's RAM is used, but I can't figure out how to find this leak: top show that all memory is used, but I can't find any process that consumed this ...
1
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1answer
91 views
How much space is in a Solaris /tmp filesystem?
On Solaris, the /tmp filesystem is a filesystem of type "tmpfs". It's implemented in the kernel by allocated space from the virtual memory pool. That means allocation interacts with the available RAM ...
1
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1answer
106 views
CentOS webserver memory overflow - cannot log in
Few days ago, my CentOS 6.2 webserver with ISPconfig 3 went down to the extent I wan't able to log in via SSH nor using a console. The console was full of messages "out of memory, killing process, ...
2
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0answers
32 views
How to interpret increasing SHR reported by top?
The man page for top defines SHR as:
t: SHR -- Shared Mem size (kb) The amount of shared memory used by a
task. It simply reflects memory that could be potentially shared with
other ...
0
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2answers
214 views
Linux out of memory on VPS
On my VPS (CentOS) 4GB ram (2 + 2 dynamically assigned when needed) and i have tomcat running with following options JAVA_OPTS="-Xms256m -Xmx2048m -XX:MaxPermSize=256m".
Now when i try to start ...
1
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1answer
168 views
100GB Virtual Memory on 64GB server without swap [duplicate]
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 ...
1
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2answers
227 views
Where's the Swap File/Partition?
I'm investigating the virtual memory configuration of a Debian based Amazon EC2 instance, and as my background isn't in system admin, I'm slightly confused by what I'm seeing.
We're using MongoDB, ...
1
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0answers
51 views
Getting the virtual memory address for (major) page faults
On a Linux (Cent OS 5) system, I have a process that accesses a large amount of memory mapped files. The process is generating a large amount of page faults because the aggregated size of the mapped ...
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4answers
122 views
Fast small static file serving on a VPS - avoiding the Disk
I need to serve a large number of very small static files (e.g. 1Million, ~1KB), from a VPS. My current favoured approach is Nginx, but my main concern is hitting slow VPS disks.
Is there an ...
2
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0answers
86 views
virtual memory commited
After a server bounce happens, and after around 40-45 days time period, we receive continuous “Committed Virtual Memory” alerts which indicates the usage of swap space in the magnitude of >4GB
This ...
3
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1answer
81 views
How do you measure the memory footprint of a set of forked processes?
Say I've got a process using 200MB of memory, and it fork()s:
python -c "import os; data='x'*200000000; os.fork(); raw_input()"
Programs like 'top' will show each process using 200MB, with very ...
3
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0answers
40 views
How can I measure disk cache churn on Linux? [duplicate]
Possible Duplicate:
Is there a way to get Cache Hit/Miss ratios for block devices in Linux?
I have a file server which serves out large (25GB-1TB+) files over the network from local ...
0
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1answer
62 views
Windows Memory being freed before limit is hit during a load test
I'm running a load test on a .NET web application over a LAN. The server hosting the web app is a VM, Windows Server 2008 R2, with 2 GB of RAM and a 3GB limit for virtual memory. No other web ...
0
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0answers
48 views
Mounting shared memory in XCP/ XEN Server,for storing VM [duplicate]
Possible Duplicate:
Mounting shared memory in XCP/ XEN Server,for storing VM
Requirement
vm with 2HDD
OS will be installed on hdd 1 and required data on HDD 2
I want all my VM ...
5
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2answers
431 views
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 ...
9
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1answer
243 views
Ballooning occuring on SQL server
From what I understand ballooning should occur only when the host begins to run out of physical memory, somewhere above 90% usage. I have an SQL server running in a three node cluster (64 GB RAM in ...
0
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1answer
645 views
Mysql using high VIRT memory and RES is compartively
is there a way to reduce the VIRT mem usage?
I am not sure what the reason is for such high usage.
It has reached upto 12g as well.
Using top command
Tasks: 348 total, 1 running, 344 sleeping, 0 ...
3
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1answer
255 views
What is shrink_slab, and why is it showing up in /var/log/messages?
I'm investigating some application issues on a Linux system and noticed this around the time of the most recent problem, but not close enough to be definitively related:
Jun 7 17:51:49 localhost ...
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1answer
108 views
Is there a way to manually provide virtual memory?
Virtual memory is disabled by the hoster in one of the Windows VServers I use to avoid heavy disk access. At the same time, the RAM provided is only 1GB, which is insufficient for an application I'm ...
1
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2answers
1k views
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 ...
7
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4answers
2k views
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 ...
0
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2answers
242 views
Windows server 2003 Programs losses ram on minimizing
This is the oddest thing I've ever had on a OS.
I run several programs that uses up to 1 gb ram.
But if i minimize the program the ram useage of it decreases too 100 mb!
It means i lost 900 mb ram ...
1
vote
2answers
227 views
Cannot change pagefile size on Windows 2008
I have a windows 2008 (virtual) machine, which I want to add a pagefile to. However, any time I try to set the page file size, after a reboot it jumps back down to 0. Why is this?
1
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1answer
703 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
158 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
89 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
287 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 ...
2
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3answers
5k 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?
1
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1answer
203 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
455 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.
...
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2answers
4k 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
458 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
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1answer
216 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 ...
0
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2answers
381 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
372 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 ...
1
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2answers
567 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 ...
1
vote
2answers
666 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 ...
1
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2answers
724 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
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1answer
5k 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 ...
6
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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
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1answer
723 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
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1answer
161 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
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1answer
542 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 ...
