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Top Forums UNIX for Advanced & Expert Users Please advise good source of info about swapping Post 302614385 by sant on Wednesday 28th of March 2012 12:42:12 PM
Old 03-28-2012
Guys,
Thanks for your comments.

If you have Oracle, buy enough memory so that it should never swap

1) Does this mean that OS will not do unnecessary paging in background?

2) Does this mean that if I have 128Gb of RAM and if I am sure that my soft (for example Oracle) will not use more than 120Gb of RAM (SGA + PGA = 110Gb), I give 8 Gb for OS (kernel, etc) and I can set swap size 0 bytes ?

3) For 8Gb RAM and 8Gb swap how much memory I can eat (really)? As I understand I can 16Gb. Am I right?
Why there was a requirement to have swap the same size as RAM? Why not 3 size of RAM or 4 sizes of RAM?
The requirement to have swap the same size of RAM looks like swap not add space to memory but something like mirror RAM memory on a disk. In this case I would be able to eat 8Gb, not 16Gb.

Please comment

---------- Post updated at 11:42 AM ---------- Previous update was at 11:36 AM ----------

From your comments I can consider that swap is just something as additional slow memory ;-)
But from my current vision concept of swap is more important and indivisible with virtual memory concept.
 

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Glib::Flags(3)						User Contributed Perl Documentation					    Glib::Flags(3)

NAME
Glib::Flags DESCRIPTION
Glib maps flag and enum values to the nicknames strings provided by the underlying C libraries. Representing flags this way in Perl is an interesting problem, which Glib solves by using some cool overloaded operators. The functions described here actually do the work of those overloaded operators. See the description of the flags operators in the "This Is Now That" section of Glib for more info. HIERARCHY
Glib::Flags METHODS
scalar = $class->new ($a) o $a (scalar) Create a new flags object with given bits. This is for use from a subclass, it's not possible to create a "Glib::Flags" object as such. For example, my $f1 = Glib::ParamFlags->new ('readable'); my $f2 = Glib::ParamFlags->new (['readable','writable']); An object like this can then be used with the overloaded operators. scalar = $a->all ($b, $swap) o $b (scalar) o $swap (scalar) ref = $a->as_arrayref integer = $a->bool ($b, $swap) o $b (scalar) o $swap (integer) integer = $a->eq ($b, $swap) o $b (scalar) o $swap (integer) integer = $a->ge ($b, $swap) o $b (scalar) o $swap (integer) scalar = $a->intersect ($b, $swap) o $b (scalar) o $swap (scalar) integer = $a->ne ($b, $swap) o $b (scalar) o $swap (integer) scalar = $a->sub ($b, $swap) o $b (scalar) o $swap (scalar) scalar = $a->union ($b, $swap) o $b (scalar) o $swap (scalar) scalar = $a->xor ($b, $swap) o $b (scalar) o $swap (scalar) SEE ALSO
Glib COPYRIGHT
Copyright (C) 2003-2009 by the gtk2-perl team. This software is licensed under the LGPL. See Glib for a full notice. perl v5.12.1 2010-07-05 Glib::Flags(3)
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