Re: lug-bg: Elegantly wasting system resources (Was: problem)

[ochinko@xxxxxxxxxxxx (Petko Boukov)]

Vizh komandata ulimit i file-a /etc/security/limits.conf Povecheto sistemi
po default sa taka natroeni, che shte zaspqt neprobudno pri izpylnenie na
programa ot sorta:

int main()
{
  fork();
  main();
}

Ako si ogranichil obache maksimalniq broj procesi na user-a s podoben red
v /etc/security/limits.conf

haralampi            hard    nproc            64

to mashinata shte ostane na kraka. Analogichno mozhesh da regulirash
maksimalnata golemina na stack-a, pametta za proces, procesorno vreme,
otvoreni file-ove...

Petko

-----Original Message-----
From: George Danchev <danchev@xxxxxxxxx>
Date: Sat, 15 Dec 2001 14:54:23 +0200
To: lug-bg@xxxxxxxxxxxxxxxxxx
Subject: Re: lug-bg: Elegantly wasting system resources (Was: problem)

> On Friday 14 December 2001 21:59, you wrote:
> > Ops gaden problem, pokazva li nqkakvi dumpove na dipleq ili v syslog-a?
> > Ili prosto se rebootva? Q probvai da si napravish nqkoq programa deto
> > tovari procesora i vig kak se dargi, primerno da smqta chisla s mnogo znaci
> > sled dec zapetaq. 
> Taka, bratq... zna4i az reshih malko da si poigraq s resourses na systemata. 
> Da kazhem imame user "haralampi"  na edi koq si sistema (nqma root prava). 
> Ssh-va se remote ili ima fizi4eski dostyp i se log-va local-no s 
> prostosmyrtniq username "haralampi" ... tova ne e ot golqmo zna4enie...
> 
> kompilira si, volno ili nevolno, slednata _brainless_ anti programka: 
> (znam 4e e lame, no "haralampi" i haber si nqma ot C ;-)
> 
> -----test.c--------------
> main()
> {
> float x,y,z;
> x=20.5123456789034567;
> y=30.3343255346567767;
> z=40.2245454345654655;
> while (y<50)
>     {   
> 	if (x<1000)
> 	    {
> 	    x=x*y*x*y;
> 	    z=x*y+x/y+y/x+x+y;
> 	    printf("x1=%50.30f\n", x);
> 	    printf("z1=%50.30f\n", z);
> 	    }
> 	else
>             {
> 	    x=x/y+y/x;
> 	    z=x*y-x/y-y/x+x+y;
> 	    printf("x2=%50.30f\n", x);
> 	    printf("z2=%50.30f\n", z);
> 	    }
>     }
> }    	    
> -------------------------------------
> 
> 
> Sled tova pak bez da iska haralampi q startiram taka:
> ---------avalanche.sh------
> #!/bin/bash
> z=0;
> while [ $z != 1 ] ; do
> ./test &
> done
> ----------------------------
> 
> Okazva se 4e se polu4avat razli4ni rezultati v zavisimost ot tova dali e  
> startiran ./avalanche.sh v xterm/konsole/gnome-terminal ili v TTY.
> (sled izvestno vreme izliza i slednoto syobstenie pri opit da se podade 
> nqkakva komanda kym sistemata: 
> bash: fork: resourse temporaly unavailabel) , koeto e normalno :).
> 
> Interesno mi e kakvo polu4avate vie i kak ste reagira root v takava 
> sitruaciq... Razbira se root ne mozhe da pokazhe 4erven karton na haralampi 
> samo za tova 4e se u4i da programira na C ili pravi podobni gluposti  
> svyrzani s habene na system resources. 


-- 

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