Sponsored Content
Full Discussion: out of memory?
Operating Systems Linux out of memory? Post 302678731 by methyl on Sunday 29th of July 2012 03:24:01 PM
Old 07-29-2012
As a rule of thumb swap should be roughly equal to installed memory and at least twice the size of the largest process. It is no longer necessary to make swap twice memory (as was required with early unix). Linux uses swap continuously to optimise memory by swapping pages. If swap is too low, the Operating System will fail to function efficiently and may even stall.

With a rogue cron it is easy to exceed the kernel maximum number of files open by one user. If it is a root cron you are heading for a crash.
 

9 More Discussions You Might Find Interesting

1. Programming

how to round up a memory address(memory alignment problem)

Hi, I try to marshal a unsigned int and a char * into a buffer, and then unmarshal them later to get them out. I need to put the char * in the front and unsigned int at the end of the buffer. However, my system always give me "BUS ERROR". I am using Sun Sparcs Sloris 2.10. My code to marshal... (6 Replies)
Discussion started by: nj302
6 Replies

2. HP-UX

How can I get memory usage or anything that show memory used from sar file?

Refer from title: How can i get memory used or anything that can show memory from sar file example on solaris:- we can use sar with option to show memory used at time that sar crontab run. on HP-UX, it not has option to see memory used. But i think it may be have some parameter or some... (1 Reply)
Discussion started by: panithat
1 Replies

3. AIX

ulimits max locked memory virtual memory

Hi, Would any one be so kind to explain me : are ulimits defined for each user seperately ? When ? Specialy what is the impact of : max locked memory and virtual memory on performance of applications for a user. Many thanks. PS : this is what I can see in MAN : ulimit ] ... (5 Replies)
Discussion started by: big123456
5 Replies

4. Solaris

How to find Total and Free Physical Memory and Logical Memory in SOLARIS 9

Hi, Im working on Solaris 9 on SPARC-32 bit running on an Ultra-80, and I have to find out the following:- 1. Total Physical Memory in the system(total RAM). 2. Available Physical Memory(i.e. RAM Usage) 3. Total (Logical) Memory in the system 4. Available (Logical) Memory. I know... (4 Replies)
Discussion started by: 0ktalmagik
4 Replies

5. Programming

How to deal with lots of data in memory in order not to run out of memory

Hi, I'm trying to learn how to manage memory when I have to deal with lots of data. Basically I'm indexing a huge file (5GB, but it can be bigger), by creating tables that holds offset <-> startOfSomeData information. Currently I'm mapping the whole file at once (yep!) but of course the... (1 Reply)
Discussion started by: emitrax
1 Replies

6. Solaris

restrcit physical memory with zone.max-locked-memory

Is it possible to restrict physical memory in solaris zone with zone.max-locked-memory just like we can do with rcapd ? I do not want to used rcapd (1 Reply)
Discussion started by: fugitive
1 Replies

7. UNIX for Advanced & Expert Users

Out of Memory error when free memory size is large

I was running a program and it stopped and showed "Out of Memory!". at that time, the RAM used by this process is around 4G and the free memory size of the machine is around 30G. Does anybody know what maybe the reason? this program is written with Perl. the OS of the machine is Solaris U8. And I... (1 Reply)
Discussion started by: lilili07
1 Replies

8. Solaris

relationship or difference between entitled memory and locked memory

Hello solaris experts, Being new to solaris containers, from Linux, feeling difficulty in understanding certain concepts. Hope somebody can help me here. I understand that, & some questions .... Locked memory -- memory which will not be swapped out at any cause. is this for... (0 Replies)
Discussion started by: thegeek
0 Replies

9. Solaris

[DOUBT] Memory high in idle process on Solaris 10 (Memory Utilization > 90%)

Hi Experts, Our servers running Solaris 10 with SAP Application. The memory utilization always >90%, but the process on SAP is too less even nothing. Why memory utilization on solaris always looks high? I have statement about memory on solaris, is this true: Memory in solaris is used for... (4 Replies)
Discussion started by: edydsuranta
4 Replies
SWAPON(8)						     Linux Programmer's Manual							 SWAPON(8)

NAME
swapon, swapoff - enable/disable devices and files for paging and swapping SYNOPSIS
/sbin/swapon [-h -V] /sbin/swapon -a [-v] [-e] /sbin/swapon [-v] [-p priority] specialfile ... /sbin/swapon [-s] /sbin/swapoff [-h -V] /sbin/swapoff -a /sbin/swapoff specialfile ... DESCRIPTION
Swapon is used to specify devices on which paging and swapping are to take place. Calls to swapon normally occur in the system multi-user initialization file /etc/rc making all swap devices available, so that the paging and swapping activity is interleaved across several devices and files. Normally, the first form is used: -h Provide help -V Display version -s Display swap usage summary by device. Equivalent to "cat /proc/swaps". Not available before Linux 2.1.25. -a All devices marked as ``swap'' swap devices in /etc/fstab are made available. Devices that are already running as swap are silently skipped. -e When -a is used with swapon, -e makes swapon silently skip devices that do not exist. -p priority Specify priority for swapon. This option is only available if swapon was compiled under and is used under a 1.3.2 or later kernel. priority is a value between 0 and 32767. See swapon(2) for a full description of swap priorities. Add pri=value to the option field of /etc/fstab for use with swapon -a. Swapoff disables swapping on the specified devices and files. When the -a flag is given, swapping is disabled on all known swap devices and files (as found in /proc/swaps or /etc/fstab). NOTE
You should not use swapon on a file with holes. Swap over NFS may not work. SEE ALSO
swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8) FILES
/dev/hd?? standard paging devices /dev/sd?? standard (SCSI) paging devices /etc/fstab ascii filesystem description table HISTORY
The swapon command appeared in 4.0BSD. Linux 1.x 25 September 1995 SWAPON(8)
All times are GMT -4. The time now is 03:57 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy