Peri CGI se perl kai C

[Alexios Chouchoulas]

On Tue, 11 Apr 2000, Christos Ricudis wrote:

> H diafora yparxei, alla an o kabrianis katalabe me to mati th diafora metaksy
> 0.011 kai 0.020 seconds, egw 8a paw na ginw kalogia sto timbuktu. Opoiadhpote
> shmantikh diafora yparxei sthn taxythta metaksy C kai perl cgi-scripts mallon
> ofeiletai sto gegonos oti h perl einai interpreted glwssa, kai oxi sto oti
> prepei na shkwseis ton interpreter (osoi kseroyn pws ginetai to demand page
> loading sto linux 8a katalaboyn giati).

  Einai peripou interpreted glwssa. Sthn arxh tou script o parser metafrazei
to script se endiamesh glwssa gia grhgorh ektelesh. Gia megala scripts, afto
prosthetei gero overhead ston xrono ekkinhshs enos script (to kserw apo
peira, ena Sun 4/310 de xairetai poly otan tou zhtas na treksei CGI me 9-10
MEGALA modules required ston kwdika -- alla afou ksekinhsei, ola pane
kala).

  Me tis kainouries Perl (5.004 kai meta;) mporeis na kaneis compile to
script sou ek twn proterwn se bytecode kai na glytwseis ta (arketa
shmantika, polles fores) overheads. O interpreter ermhnevei byte-code opws
to P-System [1] kai h Java.

  Xrhsimopoieis to B::ByteCode(?), to mod_perl, Linux (gia grhgoro
fork(2)/exec(2)) ki ena grhgoro 486 kai to bottleneck metatopizetai stis
syndeseis me th database.


> Wstoso mesa sto overhead toy http transaction, kai tou database transaction poy
> ginetai apo pisw, nomizw pws opoiadhpote diafora mallon 8a xanetai sto 8orybo.
> Gnwmh moy einai oti perissotera 8a kerdiseis an xrhsimopoihseis kapoia me8odo
> gia persistent database connections sto cgi script sou (eite fastcgi, eite IPC
> se ena programmataki poy ka8etai kai kanei serve requests gia to CGI sou), para
> apo to na ksanagrapseis to CGI se C

  Pragmati. Yparxei diafora apo Perl se C, alla *kai* sth C tha eprepe na
kaneis ta idia pragmata gia na eisai swstos. Kai h Perl einai bolikh gia
CGI.

A.


[1] Hlektroniko loukoumi s'opoion to thymatai. Extra loukoumi s'opoion to
    xrhsimopoihse mesa stous teleftaious eksh mhnes. :-)

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