Coredumps and swap - was part of Solaris Mem Consumption Post: 302223763

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Operating Systems Solaris Coredumps and swap - was part of Solaris Mem Consumption Post 302223763 by Neo on Monday 11th of August 2008 10:22:36 AM

08-11-2008

Administrator

jlliagre,

You are playing with semantics.

Swap slows you down because it is used instead of RAM..... we don't need to play semantics.

As folks agree, let's move on.

(1) The 2XRAM rule of thump for swap is a legacy artifact from days gone bye bye. RAM is cheap.

(2) There is no compelling reason to use swap if you invest in cheap memory, you will have better performance.

(3) There is no compelling reason to use swap for dump space. If you must dump, you have other choices than swap.

That is all that we have been saying. This is the days of very cheap RAM. Use RAM not swap is what reborg and I have been advising - and in defense of this position of "Use Cheap RAM Not Swap for Better Performance" we were sidetracked with a red-herring argument about dump and swap.

Honestly, you are an unwitting champion of fallacy, (you use a lot fallacy in counterpoint) because you just did the same thing with your statement:

"The default configuration for Solaris is to dump in swap." This sets up another fallacy to many readers that there is something "good" in default configs.

This point is simply another fallacious argument, because there little inherently "good" about default configurations. If so, we should all leave the root password blank, which is also a default configuration in some systems; or leave the IP address 10.0.0.1 (or what ever it is, etc), or we should leave our hostname... etc etc.

My point is a friendly one. You have great technical ideas, and are a strong contributor, but you support your good ideas with logical fallacies. I don't think you mean to do it; but you use fallacy in your counterpoints, and this is something that annoys me when *anyone* does it. Also, it distracts from the core discussion, because we have to deal with fallacies, which defies logic.

If you had of not reacted so strongly with fallacy to reborg's list, but instead commented without a fallacy in your rebuttal, I would have never joined it, as I don't do this as much as I did 10 years ago .... I leave it to the everyday system admin guys like reborg whom personally manages more servers that most could imagine!

In other words, keep up the great work, but learn to see what is fallacy and when you use it in your debate points, and then evolve toward not using fallacious logic or implications. Wikipedia is a great place to learn the basics.

Neo

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LEARN ABOUT DEBIAN

vzcalc

vzcalc(8)							    Containers								 vzcalc(8)

NAME

       vzcalc - calculate resource usage of a container

SYNOPSIS

       vzcalc [-v] CTID

DESCRIPTION

       This  utility  displays	the  share  of the host system resources a particular container is using. If the container is running, the current
       usage is displayed. High utilization values (>100%) mean the system is overloaded (or the container has an invalid configuration).

       Current
	      Shows the amount of the resources consumed by the container at a given time.

       Promised
	      Shows the resources soft limit values "promised" for a given container.

       Max    Shows the resources hard limit values "promised" for a given container.

       If the -v option is specified, the following additional information is also displayed:

       Low Mem
	      The part of memory residing at lower addresses and directly accessed by the kernel (only makes sense for 32-bit architectures).

       Total RAM
	      Total memory.

       Mem+Swap
	      Amount of memory available for applications (both RAM and swap space).

       Alloc Mem
	      Standard memory allocations made for applications in a container.  This is a more "virtual" system resource  than  RAM  or  RAM  and
	      swap.

       Num. Proc
	      Number of processes.

OPTIONS

       -v     Display additional information.

EXIT STATUS

       Normally, the exit status is 0. On error, the exit status is 1.

LICENSE

       Copyright (C) 2000-2009, Parallels, Inc. Licensed under GNU GPL.

OpenVZ								    10 Dec 2009 							 vzcalc(8)

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