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Questions tagged [virtual-memory]

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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What are the specific column headers for the “Mem-Info” dump after “oom-killer”

I'm running a Debian 8 Jessie development server. 16GB mem. I've looked at the other posts about oom-killer, but none are really pertinent to what I'm asking here I'm trying to track down what ...
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217 views

Windows Server 2016 pagefile does not increase

I apologize in advance if this is not clear enough to understand my problem, it's a bit long but I've done my best to make it understandable. I'm running an Exchange 2016 CU6 on a Windows server 2016 ...
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2answers
296 views

Error: No space left on device: (deleted)/dev/zero

**** Hoster something changed on hypervizor but said, that nothing was changed. The problem is not on the server anymore... **** Could someone help me to solve the following problem: If I want to ...
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110 views

Centos 6.8 kernel 2.6.32-642.el6.x86_64 crash at linux-2.6.32-642.el6.x86_64/mm/vmalloc.c: 630

I have intel servers running CentOS 6.8 as KVM host,and there was an OOPS or BUG occurs. kernel crash at kernel-2.6.32-642.el6/linux-2.6.32-642.el6.x86_64/mm/vmalloc.c: 630 Did anyone else have this ...
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2answers
250 views

Linux OOM-killer acting despite plenty available memory

Once a week or so the OOM-killer shoots down a postgres process in my server, despite that 'free' states it has plenty of available memory. I have read several threads here and there, but cant see ...
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14 views

Is it possible to trigger a delete/clear/compact action on the Transparent Huge Pages indicated by the /proc/meminfo value 'anonhugepages'?

Is it possible to trigger a delete/clear/compact action on the Transparent Huge Pages indicated by the /proc/meminfo value 'anonhugepages'? I'm running a Java application that is likely not tuned ...
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1answer
30 views

used (linux) memory not equal to sum of VmHWM? finding missing memory

I have a server (virtual) running Linux (Ubuntu 16.04 amd64). It has 8gb memory allocated, and it's all being used, but i don't know by what. root@server:~# free -k total used ...
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92 views

mprotect between two processes

I have mmaped shared memory (backed by /dev/shm) between two processes. 7ffff7ff3000-7ffff7ff7000 rw-s 00000000 00:16 176796 /dev/shm/shdmem One process is doing mprotect for ...
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270 views

Overcommiting Memory with KVM and Libvirt

TL;DR; What is the best practice for overcommiting memory with libvirt and kvm ? Long story - I have a small and underutilized server running multiple VMs (both host and guest running centos 7.4) ...
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2answers
420 views

VMWare not changing RAM on virtual machine

It's my first time posting on this platform so I'll try to be as detailed as possible with my question. This year I started working with servers and virtual machines for the first time, so I'm just ...
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2answers
97 views

Linux: How do I explicitly swap out everything possible?

This is essentially the reverse of "Linux: how to explicitly unswap everything possible?". I want to maximize the amount of available free memory before running a process I know will use system ...
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1answer
206 views

Different linux page cache behavior for servers doing the same work

I have two sets of servers w/128G memory, distinguished by when they were provisioned, that are behaving very differently while running the exact same daemon (elasticsearch). I am using elasticsearch ...
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178 views

hyper-v virtual machine dynamic memory warning

I have a virtual machine that uses dynamic memory in my hyper-v manager. startup memory: 1024 MB min: 1024 MB max: 4096 The memory demand (4300MB) of this vm is greater than the assigned memory (...
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1answer
67 views

Server responsiveness and swapping

I know how swapping basically works, why it's automatic and why it's generally a good thing. There is, however, a common scenario where I wish I had more control. I write LOB web applications with ...
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1answer
1k views

What is the default maximum value for /proc/sys/kernel/shmmax

I am having an amiguity as to what the maximum value in shmmax should be set. After having a look at my system's statistics, it shows the following: #cat /proc/sys/kernel/shmmax ...
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1answer
70 views

Ratio Recommended Paging Space

How would you find the approximate ratio of recommended paging space to RAM size? and does the currently allocated paging space= recommended? Where is the recommended paging space? I used the top ...
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1answer
717 views

Is there a point to having Windows manage the page file size and have a “dedicated” swap drive

On a SQL 2008R2 box we recently had a number of jobs fails for various reasons that were mostly memory related, including one stating the page file was full. The Windows 2008R2 VM had 16GB of RAM and ...
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1answer
338 views

On Linux (CentOS 7.2), why does ulimit -m not appear to restrict memory usage?

I have set ulimit -m 1000000 for my shell, then started a process that consumes a bunch of memory (a simple python script from https://unix.stackexchange.com/questions/99334/how-to-fill-90-of-the-free-...
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1answer
61 views

Server appears to have little free memory despite apparent low memory usage in userspace

A Linux server I administer has been experiencing serious performance degradations as of late, becoming particularly apparent several weeks after each time it is rebooted. In particular Jenkins jobs ...
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16 views

Can I allocated different physical memory to an ESXi Hypervisor without using vShere config?

I have a Virtual RHEL Linux 5 machine that I run, along with many others, off of a VMware ESXi Hypervisor. My processes on the VM stop unexpectedly. I look into the messages log and see something ...
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1answer
85 views

Ubuntu memory consumption

I've got the following output of the free -m command screenshot So as far as I understand, 6501MB is available for using. The problem is that I have a cron job executing some SQL and I've noticed ...
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1answer
1k views

Slab reclaimable memory is not freed when needed

Correct me if I am wrong, but to my understanding slab reclaimable holds cached kernel objects which can be freed if needed. So if application needs to allocate more space, even if the 'free' memory ...
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3k views

VirtualAlloc() failed: [0x00000008] Not enough storage is available to process this command [closed]

I keep getting the following error in my PHP error text for Xampp on Windows 10. Using WordPress as the CMS. Feeling like I have tried everything but hoping there is at least one person here that ...
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1answer
1k views

Linux Mint: Python process gets “MemoryError” before swap is even close to fully used

I'm attempting to run a Python script that requires a lot of Virtual Memory. I'm on Linux Mint 17.3 64 bit and Python 2.7. As the Python process grows, I can see (using free -m) the amount of RAM ...
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1answer
564 views

Is there a way to check if my Virtual Memory Paging is “System Managed”

For one of our applications, we need to configure virtual memory on a Windows Machine to be system Managed. This can be done manually under System Properties -> Performance (Settings...) -> ...
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711 views

System process: high virtual memory usage

Azure virtual machine (3,5 Gb) with Server2012 running 2 IIS8 sites. At some time after reboot, System (pid 4) Private Virtual Memory reaches limit (15 Gb) with 2004 event: Windows successfully ...
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106 views

Does an NFS client incur read/write page faults proportional to bytes read to/written from server?

Perhaps my knowledge of virtual memory has been supplanted by too much other junk. Recently I ran some database benchmark tests where all data was to be stored on an NFS server and accessed via NFSv3 ...
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1k views

Linux vm.vfs_cache_pressure affect page cache or not?

I want to limit page cache in linux. Some documents say increase vm.vfs_cache_pressure to control the kernel reclaim memory. I try, but not work. Linux/Documentation/sysctl/vm.txt say "Decreasing ...
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79 views

Does Microsoft SQL Server have something similar to 'sqlite:///:memory:'?

Python 2.7 SQLAlchemy Microsoft SQL Server Management Studio 10.50.2500.0 Microsoft Analysis Services Client Tools 10.50.2500.0 Microsoft Data Access Components ...
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0answers
938 views

Linux max. value for vm.max_map_count

I'm planning to increase significantly the default value of 65k max mappings; let's say multiply by 10. Assuming we have enough memory on the machine is there anything I should take care of doing that?...
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1answer
739 views

Why does Windows Server 2012 R2 Standard edition show only 20% of my available memory?

Fellow Techies-- I have a LENOVO x3650 X6/x64 based Windows server with 4 18 cores/36 logical processors-- with installed physical memory (ram) @1.5 TB, total virtual memory @1.5 TB. However, I am ...
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270 views

File writes stall during heavy disk I/O on Linux box

I have two processes running on my box => A and B. Whenever there is heavy disk I/O activity caused by writing large files to the disk by process A, I see that file writes in process B are stalling ...
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1answer
467 views

Available virtual memory size is less then pagefile size

When Windows runs out of memory commit size it starts showing 'Low memory' window and performs slowly. This low-memory warning is not directly related to free physical memory amount. One can have 7Gb ...
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1answer
647 views

Increase of Virtual Memory after update of CentOS7

I have made system updates on CentOS7 and now my Virtual Memory is full used. Before the updates the virtual memory was completely empty/swap Why? Is it a problem? How can I decrease the virtual ...
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1answer
59 views

How do you know when server memory needs to be increased?

I have a VPS running a few websites for clients. Running free -h shows the following: ~$ free -h total used free shared buffers cached Mem: 994M ...
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2answers
589 views

Virtualization limits for Ubuntu Server 14.04 LTS with KVM?

Essentially I'm after something like this: Virtualization limits for Red Hat Enterprise Linux with KVM but for Ubuntu Server 14.04 LTS. I'm trying to create some KVM guests with very large 1TB+ RAM ...
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2answers
2k views

MSSQL 2008 r2 Express: there is insufficient system memory in resource pool 'internal' to run this query

I'm experiencing this error during the lifecycle of my DotNetNuke Installation. I've change the hosting server and now I've got a Windows Server 2012 with IIS 8 an SQL server 2008 r2 Express running ...
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933 views

linux system slab cache proc_node_cache usage too large

My system run java program only, at some time the memory usage increase very quickly to a very hight percentage: memory usage of java : PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ ...
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3answers
3k views

Linux virtual memory tuning to workaround disk I/O issue

I am having a problem with a Linux server that it is writing to much to disk, thus I am having a slow response time due to a big IO wait. I already check smart values for the disks and are OK. This is ...
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Why is my server using swap even though there is lots of RAM available? [duplicate]

My server has 24 cores, 16 GB RAM, and 8 SSDs on raid 0 (I think). I've noticed it is now using a low of swap space, even though there is plenty of RAM available. load average: 2.70, 2.54, 2.50 Mem: ...
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3answers
129 views

Load balancing for a running server process with sessions

I'm developing a server application that accepts incoming connections and works with client applications. The customer wants to have two machines working: in case one goes offline, the second will ...
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1answer
571 views

Can high disk cache usage lead to external fragmentation and ultimately to page allocation failures?

We're getting page allocation failures on a Linux server (3.2 kernel). We've been told the problem is directly related to the high use of the memory for cache; this would lead to external ...
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0answers
346 views

What is using all of my memory on Ubuntu 12.04?

I keep getting alarms from Rackspace telling me that my memory usage is too high, but I can't seem to find the culprit. I ran top SHIFT + M to see top output sorted by memory, and this is what I get (...
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1answer
25k views

What is nonpaged pool?

I have a Server 2008 R2 that I maintain on a day-to-day basis. The server is good and operating fine but it keeps sending me event 2019 error logs. "The server was unable to allocate from the system ...
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1answer
687 views

MongoDB: big size of mapped memory

I'm not expert in mongo memory management but some things confuse me. I use Mongo 2.4.9 and I have a replica sets for three nodes. I have performed db.serverStatus().mem and see that size of mapped is ...
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3answers
2k views

How can I keep important VMs in memory without disabling swap?

VM Host -> Xenon E5-2440 w/ 48G mem... Everything runs CentOS6.5 (2.6.32-431) I have 4 guest VMs running each w/ 2G of memory. Their disk images are local files. The host machine is also running a ...
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3answers
1k views

High Memory 64bit server, not using all ram

I have several high memory linux servers running centos 64bit, and after 10-20 days of uptime I have noticed on all of these servers they dont actually use all the ram available to then (they all have ...
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116 views

Stack , data and address space limits on an Ubuntu server

I am running an Ubuntu server which has around 5000 users. The users are allowed to SSH in to the system. So in order to cap the memory used up by a process I have capped the address space limits ...
3
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1answer
4k views

Large virtual memory size of ElasticSearch JVM

I am running a JVM to support ElasticSearch. I am still working on sizing and tuning, so I left the JVM's max heap size at ElasticSearch's default of 1GB. After putting data in the database, I find ...
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1answer
14k views

Running out of memory, or running out of disk space?

I'm running a database loading process (osm2pgsql) which is failing: Processing: Node(17404k 148.8k/s) Way(1351k 6.38k/s) Relation(9520 29.94/s)way_done failed: ERROR: could not extend file "base/...