Cache !

[Alexios Chouchoulas]

On Tue, 12 May 1998, Billy Nikolopoulos wrote:

> Den tha diafoniso mazi sou oti i cache kanei kalo. Se merikes omos
> periprtoseis opos sto diko mou mixanima kapoies fores den mou xreiazetai
> kai toso. paradeigma ena trexeis ena video arxeio den sou xreiazetai na
> to kaneis cache afou sinithow den prokeitai na to ksanadeis. To caching
> pou kanei einai thema leitourgikou i taxitita omos
> tou Linux den ofeiletai apoklistika stin cache (ksereis kalitera apo emena
> !)

  Prokeimenou na epitaxyneis to systhma sou me apeftheias elegxo tou disk
caching, prepei na ksereis para poly kala ti kaneis. Prepei na exeis
diabasei toulaxiston to kata Tannenbaum evaggelio kai ei dynaton na mporeis
na apaggeileis megala tmhmata tou kata Knuth.

  Epeidh oi perissoteroi koinoi thnitoi den exoume tetoia eftyxia (ta
evaggelia einai kai akriba), epitrepoume sto Linux na apofasizei poso disk
cache xreiazomaste. Ypothetoume oti to Linux kserei kati parapanw mia kai
aftoi pou to egrapsan mourmourizoun oloklhro to kata Tannenbaum (kai isws
kai to kata Knuth, h akoma kai Dijkstra) ston ypno tous kathe brady (pros
megalh dysareskeia tou ekastote syntrofou ths zwhs tous).

  Kai exoume dikio, giati ontws to Linux exei arketa kalo algorithmo gia to
megethos tou caching.

  Otan xreiasteis core, to disk cache the mikrynei amesws gia na apokthseis
osa siderenia daxtylidakia theleis. Otan exeis diathesimo core, to cache tha
megalwsei gia na katalabei osh mnhmh yparxei proxeirh.

  To basiko krithrio einai to ekshs, opws exei eipwthei sta newsgroups: h
mnhmh einai akribh. Ena leitourgiko pou den ekmetallevetai plhrws OLH th
mnhmh einai kako leitourgiko (can you say "Winblows"?). To Linux frontizei
na xrhsimopoiei oso perissoterh mnhmh ginetai oso kalytera ginetai.


> Eplizo me merika MB RAM akoma na min exo to idio problima !

  Mhpws tha prepei na eksetaseis kai thn ypologistikh sou isxy? En telei, an
h taxythta sou einai toso shmantikh, xrhsimopoihse arnhtiko nice gia na
afkshseis thn proteraiothta tou process pou sou xreiazetai. An sou einai
TOSO shmantikh h taxythta, anapse tou to real-time flag sto process (yparxei
akoma afto, alitheia? An nai, pws to anaboume? Pote den to exw
xrhsimopoihsei). An kai pali tipota den ginetai, elegse mhpws trexeis tipota
ogkwdeis daimones pou den prepei/den theleis na trexeis (px
rpc.{nfsd,mountd} se stand-alone mhxanhma).


Kalh tyxh!

-------------------------- ,o88,o888o,,o888o. --------------------------------
Alexios Chouchoulas         '88    ,88'   ,88'   http://www.vennea.demon.co.uk 
The Unpronounceable One    ,o88oooo88ooooo88oo,     alexios at vennea.demon.co.uk

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