poll

[Alexios Chouchoulas]

On Fri, 2 May 1997, Giannis Tsakiris wrote:

> malista! kai giati egw edw kai ena xrono sxedon nomiza oti n
> tv_usec antiprosopeve ari8mo ekatostwn tou defteroleptou ???

  Ma afou grafei usec (otan grafeis monades metrhshs sto latiniko alfabhto
to 'u' mimeitai to ellhniko mi, opote "micro")! :-)


> (apokliontas tin etsi apo metriseis POLY megalis akrivias)

  Poso megalhs akribeias? Opws egrapsan ki alloi, o kernel exei hardwired
clock rate 100Hz, opote den mporeis na exeis megalyterh akribeia apo afto.
Par'ola afta sto POSIX h akribeia orizetai se microdefterolepta gia logous
mellontikhs epektashs kai platform independence.

  An theleis metrhseis MEGALHS akribeias, sou synistw na koitakseis sta FTP
sites gia ena paketo pou kanei to Linux real time. Dystyxws den thymamai
onomata klp, alla an psakseis ta archives tou c.o.l.a. gia real time mallon
tha to breis.


> wstosw, dokimasa tin akrivia tis select() se ena sparcstation 1+
> kai paratirisa oti i akrivia tis einai aparadekti gia times stin
> timeval mikroteres twn 10.000 microsecond.

  Pragmati! Kai pali kalh akribeia bgazei. Kathe systhma exei dikh tou,
diaforetikh akribeia stous timers. Eksartatai apo to hardware kai to
software. H select() einai POSIX symbath, opote prepei na kalyptei ola ta
systhmata. Koinws, dinei megalyterh akribeia ap'oti xreiazetai.


Alexios Chouchoulas          '88    ,88'   ,88'     alexios at vennea.demon.co.uk
The Unpronouncable One      ,o88oooo88ooooo88oo,              axc at dcs.ed.ac.uk

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