10-20-2009
From the free man page:
Quote:
The -o switch disables the display of a "buffer adjusted" line. If the -o option is not specified, free subtracts buffer memory from the used memory and adds it to the free memory reported.
This answers your question - free thinks buffer memory is really free memory. Which is what I explained above.
Free means it is not absolutely required by an active process. The kernel uses 'extra' memory to facilitate operations - like I/O. Those are the buffers in question. It is kind of like luxury uptake of an unrequired resource, if that makes more sense to you.
What are you trying to figure out?
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi,
I am facing an interesting aspect of find command...
to be clear, we are running a small web server with oracle 8i database and Oralce9iAS on Sun E250 with Solaris 2.6
Over a period of time, the free memory ( displayed in 'top' utility ) drops down.. we could relate this to dedicated... (6 Replies)
Discussion started by: shibz
6 Replies
2. UNIX for Dummies Questions & Answers
In Solaris 2.6 and 8
How do I find out how much swap and memory is free?
Also how can I see how much memory each process is consuming?
Thanks in advance (2 Replies)
Discussion started by: expos
2 Replies
3. Programming
For example if i have the piece of code as follows:
CountryName = (char *)malloc((strlen(CountryName)+1)*sizeof(char));
memset(CountryName, 0, strlen(CountryName)+1);
CountryName = SOME VALUE
Now how do i free the memory after use of this code???? :confused: (3 Replies)
Discussion started by: jazz
3 Replies
4. AIX
Hi,
how to find free memory in aix? for installing oracle,I have used svmon but not getting proper output (1 Reply)
Discussion started by: manoj.solaris
1 Replies
5. Solaris
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
6. Solaris
Hi all,
Could please let me know how to get the more memory free space (not added the RAM) in local zone.
-bash-3.00# vmstat 2 5
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr s0 s1 s1 s1 in sy cs us sy... (3 Replies)
Discussion started by: murthy76
3 Replies
7. UNIX for Advanced & Expert Users
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. Programming
Hi guys.
I've a question, if we are using a syscall that receives a string allocated dynamicaly to a determined size, or NUL and it will allocate the apropriate size. We should free the memory or the OS will do it for us?
If a function returns a pointer we should free that poiter when we are done... (7 Replies)
Discussion started by: pharaoh
7 Replies
9. AIX
All,
AIX: 6.1 64 bits
How to find out Free memory available on AIX 6.1 64 bits
When I used :
svmon -G
size inuse free pin virtual mmode
memory 1048576 612109 191151 215969 549824 Ded-E
pg space 4325376 ... (1 Reply)
Discussion started by: a1_win
1 Replies
10. Solaris
If I understand your question correctly, you are asking for an explanation of Solaris memory manager. You'd better ask Oracle that question because you are talking about Solaris kernel internals.
The operating system kernel has no reason to kick a process's memory set out of real memory until... (4 Replies)
Discussion started by: hicksd8
4 Replies
LEARN ABOUT DEBIAN
empty-page
EMPTY-PAGE(1) ExactImage Manual EMPTY-PAGE(1)
NAME
empty-page - empty page detector of the ExactImage toolkit
SYNOPSIS
empty-page [option...] {-i | --input} input-file
empty-page {-h | --help}
DESCRIPTION
ExactImage is a fast C++ image processing library. Unlike many other library frameworks it allows operation in several color spaces and bit
depths natively, resulting in low memory and computational requirements.
empty-page counts dark pixels of a black and white image and decides with a threshold whether the page is most probably empty, and thus can
be removed from the image processing stream.
OPTIONS
-i file, --input file
Read image from the specified file.
-m n, --margin n
Set width of border margin to skip. For speed reasons, the margin has to be a multiple of 8. The default is 16.
-p x, --percentage x
Set fraction of permissible dark pixels. The default is 0.05 (5%).
-h, --help
Display help text and exit.
EXAMPLES
$ empty-page -i test.tif
The image has 75461 dark pixels from a total of 1060992 (7.11231%).
non-empty
EXIT STATUS
The exit status is 0 if the image is mostly white, 1 otherwise.
SEE ALSO
exactimage(7)
AUTHORS
Jakub Wilk <jwilk@debian.org>
Wrote this manual page for the Debian system.
http://www.exactcode.de/site/open_source/exactimage/
This manual page incorporates texts found on the ExactImage homepage.
COPYRIGHT
This manual page was written for the Debian system (and may be used by others).
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or (at
your option) any later version published by the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2.
empty-page 09/09/2013 EMPTY-PAGE(1)