Http/Apache server configuration

[Yannis Kotsinos]

On Wednesday 16 July 2003 11:26, Sidirourgos Lefteris wrote:
> On Wed, 16 Jul 2003, Giannis Stoilis wrote:
> > Sidirourgos Lefteris wrote:
> > > mhpws 3erete kanena link sto web me plhrofories sxetika me to ti 8elei
> > > enas web server? Dhladh, an ypo8esw oti 8elw ena mhxanhma gia
> > > http-servlets-database, exei ginei kapoia meleth poy leei oti
> > > xreiazesai toso mnhmh kai toso ypologisthkh dynamh gia tosa
> > > connection/day klp... Den moy kanei apla na moy peite: "megale bale
> > > poly mnhmh giati etsi exw akousei", 8elw kapoia meleth tekmiriwmenh poy
> > > na leei oti: "epeidh o apache shkwnei threads 8elei 10k gia ka8e thread
> > > kai ...". Mphkate sto nohma ;)

<snip>

> Profanws, den exw kapoio mhxanhma ayth thn stigmh poy trexei web
> services gia na kanw "ps xua". 8elw na agorasw ena, kai 8elw technical
> reports poy basizontai se ka8ara 8emata ylopoihseis twn en' logo
> texnologiwn kai na apantoyn sta erwthmata moy me tropo texniko
> kai episthmoniko. Sigoura yparxoun kai white papers apo benchmarks, apla
> rwthsa gia na dw mhpws 3erei kaneis kati kalo.
>
> lefteris

An kai ayto poy rwtas einai arketa asafes apo th fysh toy... Den nomizw pws 8a 
breis kati poy 8a einai _akribws_ oti zhtas. Yparxoyn men commercial stress 
programmata poy mporoyn na ypologisoyn to memory kai cpu load, alla pali ayta 
exoyn nohma mono se yparxonta systhmata kai efarmoges ka8ws nomizw pws 
katalabaineis oti otan milame gia java (read java's memory allocation) to pws 
akribws 8a ginei to implementation toy otidhpote[0] den einai amelhteo wste 
na 8ewreitai kai dedomeno se ena whitepaper. Kai an 8a breis kati tetoio 
mallon 8a anaferetai se kapoia barebones implementations ws apla mia endei3h 
kai proseggish.

Xondrika, se server me kammia 30aria kai bale sites (ena virtual host kai ena 
application server gia to ka8e ena) me apache kai tomcat to cpu load einai 
sxedon amelhteo kai proerxetai kyriws apo th bash. Alla, sto 8ema ths mnhmhs, 
opws 8a to perimenes, oi apaithseis einai megales. To mono poy mporei na se 
glytwsei - h na se kapsei an den to kaneis - einai na xrhsimopoihseis tis 
object-oriented texnikes an den 8es na deis to memory usage na anebainei 
geometrika ka8ws anebainoyn ta hits h oi virtual hosts soy. Koinws, na 
xrhsimopoieis oso to dynaton perissotera (koina) beans kai servlets meta3y 
twn virtual application server soy (allo 30 diaforetika objects kai allo 30 
copies toy idioy -> shared). Kai ayta 8a prepei na einai oso to dynaton 
beltistopoihmena. Me ayta ws dedomeno, se diafores koybentes gia to idio 8ema 
(nai empeirika), milame gia >= 512 mb mnhmhs (3ekinwntas). Panta endeiktika 
pare kai to output apo ton legameno server:


CPU states:  2.7% user, 22.6% system,  0.0% nice, 74.6% idle
Mem:   514092K av,  509636K used,    4456K free,       0K shrd,    7364K buff
Swap: 1934308K av,  508944K used, 1425364K free                247988K cached

PRI  NI  SIZE  RSS SHARE STAT  LIB %CPU %MEM   TIME COMMAND
 16   0  8864 2836  1988 S       0  2.0  0.5  61:20 interserver
 12   0 26728 2888  2184 S       0  0.4  0.5 129:14 interserver
 10   0 22204  16M 10480 S       0  0.1  3.3   1:17 java
  9   0  306M 163M  128M S      64  0.1 32.5   1:08 java

Pantws, opws eipe kai o giannis o stoilis, an tyxon breis kati endiaferon kane 
moy ena cc.

[0]: classic paradeigma: dokimase na grapseis ena servlet xrhsimopoiwntas mono 
strings kai to idio xrhsimopoiwntas mono stringbuffer

-- 
"An idea is not responsible for the people who believe in it."
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