07-13-2013
Isn't it Linux philosophy to not think of swap before the last piece of memory is used up? And answer question "why is paging so slow" with "get more RAM"?
So simply assume 0, and for safety buy more RAM!
10 More Discussions You Might Find Interesting
1. Solaris
Hello
there are different opinions on how to get the swap space on Solaris.
some say: swap -s and the space= used + available
others say swap -l (donno how they get the swap size)
other say 'top' command
others say using format command (in print sub-command)
Could you please advise on... (1 Reply)
Discussion started by: melanie_pfefer
1 Replies
2. Red Hat
Hi,
I need to set a locale to my linux machine which has redhat enterprise linux 4
how should I do that.
And also when i did locale -a, I have got three versions for each locale type
with different .extensions like utf8,iso88951 and soon
which file should I use for setting locale.
... (1 Reply)
Discussion started by: eamani_sun
1 Replies
3. UNIX for Dummies Questions & Answers
There are two servers where my machine is connected. Is there any type of link formed between my machine and server machine? (1 Reply)
Discussion started by: palash2k
1 Replies
4. Programming
Hi,
I have written a c program to find cos() of a value , its not working, I am getting value of "val " as 0000.
#include<stdio.h>
#include<math.h>
main()
{
float val;
val = cosf( 1.570796);
printf("\nval = %f",val);
} (9 Replies)
Discussion started by: shashi
9 Replies
5. HP-UX
How do I check if the root and swap are mirrored on my HP9000 machine?
Thank you,
N. (33 Replies)
Discussion started by: NicoMan
33 Replies
6. UNIX for Dummies Questions & Answers
I tried using the mail command on one of our Linux machines to send email, and it works fine. I tried using the same command on another one of our Linux machines, and it didn't work (no error message was returned either).
The machine that works has the following version information:... (2 Replies)
Discussion started by: sllinux
2 Replies
7. Shell Programming and Scripting
Hi
I tried running the code
scrname=`whence $0 | sed -e 's/\.\///g'`
where $0 is substituted by cm_dsjobrun.sh
in unix env then the value it returns me is
SCRNAME=/data/ds/dpr_ebicm_uat/etl/cm3_0/scripts/shell/cm_dsjobrun.sh
whereas i ran the same code on linux env
The value... (9 Replies)
Discussion started by: vee_789
9 Replies
8. Shell Programming and Scripting
Hi All
I have fired a command in linux
table=`echo ${file_name} | awk '{FS="/"; print $NF}' | awk '{FS="."; print $1}'`
where file_name has
/data/ds/dpr_ebicm_uat/backfill/temp/etl_app_info.csv
/data/ds/dpr_ebicm_uat/backfill/temp/etl_app_jobs.csv ... (10 Replies)
Discussion started by: vee_789
10 Replies
9. Red Hat
I am using Linux RHEL5 64 bit and installed oracle 11g.
I want to check ODBC connection , i had modified odbc.ini file
when i use this command -isql
I am getting following error .
bash: isql: command not found
Kindly help (5 Replies)
Discussion started by: roopalidalvi231
5 Replies
10. UNIX for Beginners Questions & Answers
Hello,
I am on a Mac and trying to clean up some monthly files with a very simple SED:
sed '3,10d;/<ACROSS>/,$d' input.txt > output.txt
(from the input, delete lines 3 - 10; then delete from the line containing <ACROSS> to the end of the file)
then output to output.txt
Even when I try... (2 Replies)
Discussion started by: verbatim
2 Replies
LEARN ABOUT DEBIAN
dphys-swapfile
DPHYS-SWAPFILE(8) System Manager's Manual DPHYS-SWAPFILE(8)
NAME
dphys-swapfile - set up, mount/unmount, and delete an swap file
SYNOPSIS
dphys-swapfile setup|swapon|swapoff|uninstall
DESCRIPTION
dphys-swapfile computes the size for an optimal swap file (and resizes an existing swap file if necessary), mounts an swap file, unmounts
it, and and delete it if not wanted any more.
OPTIONS
There is only one parameter, an command, which can be either of these:
setup Tells dphys-swapfile to compute the optimal swap file size and (re-)generate an fitting swap file. Default it 2 times RAM size. This
can be called at boot time, so the file allways stays the right size for current RAM, or run by hand whenever RAM size has changed.
swapon and swapoff These run the swapon and swapoff commands on the swapfile. Note that direct swapon/off from /etc/fstab is not possible,
as that is (at least on Debian) done in the same script that mounts /var (which is where the swap file most likely resides). And we
need to do our setup between those actions. So pass up /etc/fstab, and do our own swapon/off.
uninstall
Gets rid of an unwanted swap file, reclaiming the disk space.
CONFIG
The config file /etc/dphys-swapfile allows the user to set up the working environment for dphys-swapfile.
This config file is a sh script fragment full of assignments, which is sourced. Standard sh syntax rules apply. Assignments are:
CONF_SWAPFILE
Set where the swap file should be placed. Defaults to /var/swap. It is unlikely that you will need to change this, unless you have
very strange partitioning, and then you will most likely be using an swap partition anyway.
CONF_SWAPSIZE
Force file size to this. Default is 2*RAM size. This is unlikely to be needed, unless in strange diskspace situations. Note that
swap enabled and smaller than RAM causes kernal-internal VM trouble on random systems.
CONF_SWAPFACTOR
Set the relation between RAM and swap size. Must be an integer. Defaults to 2 which means swap size = 2 * RAM size
CONF_MAXSWAP
Set maximum size of the swap file in MBytes. Defaults to 2048 which was the former kernel limit for the swapfile size and is now a
limit to prevent unusual big swap files on systems with a lot of RAM.
FILES
/etc/dphys-swapfile
user config
$CONF_SWAPFILE
the swap file, target of the whole action (defaults to /var/swap)
EXAMPLES
dphys-swapfile is usually run at system startup and shutdown from an /etc/init.d (or /etc/rc.d) script, such as this (minimal) one:
#!/bin/sh
# /etc/init.d/dphys-swapfile - automatically set up an swapfile
# author franklin, last modification 2004.06.04
# This script is copyright ETH Zuerich Physics Departement,
# use under either modified/non-advertising BSD or GPL license
case "$1" in
start)
/sbin/dphys-swapfile setup
/sbin/dphys-swapfile swapon
;;
stop)
/sbin/dphys-swapfile swapoff
;;
esac
exit 0
If an sysadmin wants to have his swapfile in annother place, say /var/run/swap, he can use:
In /etc/dphys-swapfile:
CONF_SWAPFILE=/var/run/swap
AUTHOR
franklin@phys.ethz.ch, http://www.phys.ethz.ch/~franklin/
D-PHYS Swapfile Tools 2006.09.15 DPHYS-SWAPFILE(8)