Otan o server kanei thrashing

[Christos Ricudis]

, Harris Kosmidhs wrote:

> On 9/3/2010 12:25 μμ, Thanasis wrote:
>> on 03/09/2010 11:57 AM Harris Kosmidhs wrote the following:
>>> On 8/3/2010 2:46 μμ, Christos Ricudis wrote:
>>>> apo th stigmh pou arxiseis na exeis thrashing, ksexna to. To kolpo
>>>> einai na to kaneis monitor PRIN arxisei to thrashing, wste na deis
>>>> ti to prokalei. mia kalh lysh einai na apenergopoihseis teleiws to
>>>> swap. (egw genika de bazw pote swap se server machines).
>>>
>>> γιατί;;
>>>
>> Δεν εξήγησε το γιατί πιο κάτω;
>
> λέει
> apo th stigmh pou arxiseis na exeis thrashing, ksexna to. To kolpo einai
> na to kaneis monitor PRIN arxisei to thrashing, wste na deis ti to
> prokalei. mia kalh lysh einai na apenergopoihseis teleiws to swap. (egw
> genika de bazw pote swap se server machines). Ean to systhma arxisei na
> mhn exei mnhmh, o OOM killer 8a arxisei na skotwnei opoio process 8ewrei
> ypey8yno gia thnkatastrofh. polles fores einai to la8os process alla
> toulaxiston einai mia kalh arx, kai mporeis na deis apo ta kernel logs
> ti exei skotwsei to OOM.
>
> Ναι ίσως έχεις δίκιο. Απλά θεώρησα ότι το "Ean to systhma arxisei na mhn
> exei mnhmh," μπορεί να συμβει με ή χωρίς swap (αν υποθέσουμε ότι και το
> swap γεμίσει).
>
> Αλλά γιατί να φτάσεις στο σημείο να κάνει ο OOM kill processes αντι να
> βάλεις κάποια GB swap;


Epeidh de 8a se boh8hsoun pou8ena.

Prosekse oti de milame gia thn periptwsh enos desktop mhxanhmatos sto 
opoio p.x mporei na einai 8emito na kaneis swap-out to resident set tou 
firefox oso xrhsimopoieis to thunderbird. Milame gia ena server 
mhxanhma, sto opoio synh8ws otan o apache p.x. arxizei na kanei swapout, 
to mono pou katafernei einai na mazepsei sthn oura akoma perissotera 
requests pros eksyphrethsh pou piezoun akoma perissotero mia hdh asxhmh 
katastash. Genika se tetoies periptwseis prepei apla na tou dineis osh 
ram xreiazetai, kai na mh xrhsimopoieis ka8olou swap.