Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Can i delete this file ?
Top Forums UNIX for Beginners Questions & Answers Can i delete this file ? Post 303033543 by Neo on Monday 8th of April 2019 02:05:15 AM
Old 04-08-2019
If a user boots a system without swap, the system will still boot and Linux will dynamically allocate memory, and is very good at it.

Yes, this could cause the system to run slower (not using swap) and thrash, but it can still be done.

Quote:
Thrashing can occur when total virtual memory, both RAM and swap space, become nearly full. The system spends so much time paging blocks of memory between swap space and RAM and back that little time is left for real work. The typical symptoms of this are obvious: The system becomes slow or completely unresponsive, and the hard drive activity light is on almost constantly.


So the "absolute" answer "NO" is not really accurate.

It can be done and the system will work if swap is turned off, but your performance could dive and the system thrash.

Is it a good idea? Well, that depends on the constraints the user is working under, but if it is working well now, why do it?

I have ran many Linux servers over the years with zero swap and they work fine, but I like to have a lot of memory in servers.

There is nothing wrong with experimenting; but you need to be careful of course if the system is a production system with critical apps in real or near-real time.

It does not hurt (if the system is not critical to production) to turn swap off if you really need to reclaim the disk space and for some reason don't want to add more disk space.

Having said that, both memory and disk space is pretty cheap these days, so why torture yourself about all this?

Is this a mission critical production server that you do not want to bring down to add disk space or memory?

Why not add more memory and / or disk space?

Thanks.
This User Gave Thanks to Neo For This Post:
vbe
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Delete block of text in one file based on list in another file

Hi all I currently use the following in shell. #!/bin/sh while read LINE do perl -i -ne "$/ = ''; print if !m'Using archive: ${LINE}'ms;" "datafile" done < "listfile" NOTE the single quote delimiters in the expression. It's highly likely the 'LINE' may very well have characters in it... (3 Replies)
Discussion started by: Festus Hagen
3 Replies

2. Shell Programming and Scripting

How to delete a string pattern in a file and write back to the same file

I have a control file which looks like this LOAD DATA INFILE '/array/data/data_Finished_T5_col_change/home/oracle/emp.dat' PRESERVE BLANKS INTO TABLE SCOTT.EMP FIELDS TERMINATED BY '|' OPTIONALLY ENCLOSED BY '"' TRAILING NULLCOLS (................. ..................) How can i edit the... (1 Reply)
Discussion started by: mwrg
1 Replies

3. Solaris

Before I delete any file in Unix, How can I check no open file handle is pointing to that file?

I know how to check if any file has a unix process using a file by looking at 'lsof <fullpath/filename>' command. I think using lsof is very expensive. Also to make it accurate we need to inlcude fullpath of the file. Is there another command that can tell if a file has a truely active... (12 Replies)
Discussion started by: kchinnam
12 Replies

4. Homework & Coursework Questions

how to delete core file (file created due to apps crashed)

1. The problem statement, all variables and given/known data: When looking for corefiles, include any file with core in its name. (Some UNIX/Linux systems add the PID of the process that created the core to reduce the chances of overwriting an already existing core file that might be needed. The... (6 Replies)
Discussion started by: s3270226
6 Replies

5. Shell Programming and Scripting

Delete a pattern present in file 2 from file 1 if found in file 1.

I have two files File1 ==== 1|2000-00-00|2010-02-02|| 2| 00:00:00|2012-02-24|| 3|2000-00-00|2011-02-02|| File2 ==== 2000-00-00 00:00:00 I want the delete the patterns which are found in file 2 from file 1, Expected output: File1 ==== (5 Replies)
Discussion started by: machomaddy
5 Replies

6. Shell Programming and Scripting

Need unix commands to delete records from one file if the same record present in another file...

Need unix commands to delete records from one file if the same record present in another file... just like join ... if the record present in both files.. delete from first file or delete the particular record and write the unmatched records to new file.. tried with grep and while... (6 Replies)
Discussion started by: msathees
6 Replies

7. UNIX for Dummies Questions & Answers

To delete the oldest files in a file when file count in the folder exceeds 7

Hi All, I need to delete the oldest file in folder when the file count in the folder exceed 6 ( i have a process that puts the source files into this folder ) E.x : Folder : /data/opt/backup 01/01/2012 a.txt 01/02/2012 b.txt ... (1 Reply)
Discussion started by: akshay01987
1 Replies

8. Shell Programming and Scripting

Compare two string in two separate file and delete some line of file

Hi all i want to write program with shell script that able compare two file content and if one of lines of file have # at the first of string or nothing find same string in one of two file . remove the line in second file that have not the string in first file. for example: file... (2 Replies)
Discussion started by: saleh67
2 Replies

9. Red Hat

Need Script to ZIP/SAVE & then DELETE Log file & DELETE ZIPS older than 12 months

ENVIROMENT Linux: Fedora Core release 1 (Yarrow) iPlanet: iPlanet-WebServer-Enterprise/6.0SP1 Log Path: /usr/iplanet/servers/https-company/logs I have iPlanet log rotation enabled rotating files on a daily basis. The rotated logs are NOT compressed & are taking up too much space. I... (7 Replies)
Discussion started by: zachs
7 Replies

10. UNIX for Dummies Questions & Answers

Delete files whose file names are listed in a .txt file

hi, I need a help. I used this command to list all the log files which are for more than 10 days to a text file. find /usr/script_test -type f -mtime +10>>/usr/ftprm.txt I want all these files listed in the ftprm.txt to be ftp in another machine and then rm the files. Anyone can help me... (8 Replies)
Discussion started by: kamaldev
8 Replies

LEARN ABOUT HPUX

swapmem_on

swapmem_on(5)							     OBSOLETE							     swapmem_on(5)

NAME

       swapmem_on - OBSOLETE kernel tunable parameter

DESCRIPTION

       The tunable is obsolete.  Processes will always be allowed to use pseudo-swap space if it is available.

       In previous versions of HP-UX, system configuration required sufficient physical swap space for the maximum possible number of processes on
       the system.  This is because HP-UX reserves swap space for a process when it is created, to ensure that a running process never needs to be
       killed due to insufficient swap.

       This  was difficult, however, for systems needing gigabytes of swap space with gigabytes of physical memory, and those with workloads where
       the entire load would always be in core.  This tunable was created to allow system swap space to be less than core memory.   To	accomplish
       this,  a  portion  of  physical	memory	is  set aside as "pseudo-swap" space.  While actual swap space is still available, processes still
       reserve all the swap they will need at fork or execute time from the physical device or file system swap.  Once	this  swap  is	completely
       used,  new  processes  do  not  reserve	swap, and each page which would have been swapped to the physical device or file system is instead
       locked in memory and counted as part of the pseudo-swap space.

WARNINGS

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters						     swapmem_on(5)
All times are GMT -4. The time now is 08:44 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy