03-21-2005
Buffer Cache
What is the "Buffer Cache" used for?
10 More Discussions You Might Find Interesting
1. Filesystems, Disks and Memory
anybody please tell me how do i get all the information
about buffer cache in hp-ux .if anybody familiar with the system
call them please specify .
i found the extern variables in /sys/buf.h . but that didn't help .:) (2 Replies)
Discussion started by: vish_shan
2 Replies
2. UNIX for Advanced & Expert Users
i have a serious doubht about the assignment of memory
in hp-ux system .
i read from somewhere that the page allocation in
hp-ux is not unified unlike compaq .
i wanted to know in hp-ux kernel ,once the pages are
assigned for the univarsal buffer cache... (2 Replies)
Discussion started by: vish_shan
2 Replies
3. Solaris
Does anyone know how the unix buffer / cache is set in a Solaris based system ?
( I presume it is a kernel based setting )
I notice from SAR -d that my read cache is consistently at 100% but my write cache frequently falls below 65%. What does this mean. Should I be tuning the write cache and... (1 Reply)
Discussion started by: jimthompson
1 Replies
4. Red Hat
hi everyone,
can any one help change the buffer cache size in redhat and suse?? this error i got when i installed oracle 10g and it went well and when i try to mount the database using startup cmd it says too many buffer cache parameters (error code : ora-1034)
thnq in advance (0 Replies)
Discussion started by: gsr_kashyap
0 Replies
5. UNIX for Dummies Questions & Answers
Hi,
Is it possible to reduce the amount of buffer cache in the memory allocation of a Unix Server? If so where can I do that?
Also, does buffer cache count as tied up memory, or will it decrease as more memory is requested by other programs. (1 Reply)
Discussion started by: dehuang83
1 Replies
6. Filesystems, Disks and Memory
Hi,
I am trying to understand the role of buffer cache in block I/O.
I am monitoring /proc/meminfo, my question is does the value of 0 for 'buffers', mean that any subsequent disk read issued by a process, would get the data physically from the disk, and not an allocated buffer for the block?
... (1 Reply)
Discussion started by: jake24
1 Replies
7. Linux
Hi all
I saw in Microsoft web site www.SysInternals.com a tool called CoreInfo from able to print out on screen the size of the Data and Instruction caches of your processor, the Locigal to Physical Processor mapping, the number of the CPU sockets. etc..
Do you know if in Linux is available a... (2 Replies)
Discussion started by: manustone
2 Replies
8. Linux
Hi All,
could any one point out any open source test-suites for "File cache" testing and as well as performance test suites for the same. Currently my system is up with Linux/ext4.
Regards
Manish (0 Replies)
Discussion started by: hmanish
0 Replies
9. UNIX for Advanced & Expert Users
I was reading a book on UNIX internals "The design of the UNIX Operating system." There are two memory structures that are confusing me:
1) Buffer cache
2) Inode cache
My questions are
1) Does a process get both buffer cache and Indoe cache allocated when it opens/creates a file?
2) if no,... (1 Reply)
Discussion started by: sreeharshasn
1 Replies
10. Shell Programming and Scripting
Moderators,
Please excuse if I am in the wrong section.
I have a question that someone may know the answer to. We know that a current bash shell keeps a record of all commands in a buffer. When the shell is terminated this buffer is written out to ~/.bash_history for the user.
I know... (2 Replies)
Discussion started by: jaysunn
2 Replies
LEARN ABOUT DEBIAN
cache::null
Cache::Null(3pm) User Contributed Perl Documentation Cache::Null(3pm)
NAME
Cache::Null - Null implementation of the Cache interface
SYNOPSIS
use Cache::Null;
my $cache = Cache::Null->new();
See Cache for the usage synopsis.
DESCRIPTION
The Cache::Null class implements the Cache interface, but does not actually persist data. This is useful when developing and debugging a
system and you wish to easily turn off caching. As a result, all calls return results indicating that there is no data stored.
CONSTRUCTOR
my $cache = Cache::Null->new( %options )
The constructor takes cache properties as named arguments, for example:
my $cache = Cache::Null->new( default_expires => '600 sec' );
See 'PROPERTIES' below and in the Cache documentation for a list of all available properties that can be set. However it should be noted
that all the existing properties, such as default_expires, have no effect in a Null cache.
METHODS
See 'Cache' for the API documentation.
SEE ALSO
Cache
AUTHOR
Chris Leishman <chris@leishman.org>
Based on work by DeWitt Clinton <dewitt@unto.net>
COPYRIGHT
Copyright (C) 2003-2006 Chris Leishman. All Rights Reserved.
This module is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either expressed or implied. This program is free software;
you can redistribute or modify it under the same terms as Perl itself.
$Id: Null.pm,v 1.4 2006/01/31 15:23:58 caleishm Exp $
perl v5.12.4 2011-08-05 Cache::Null(3pm)