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Re: [enterprise] Maskiner med 128 GB RAM - erfaringer



On Mon, 4 May 2009, Troels Arvin wrote:

17 Apr 2009 16:08:50 +0200 skrev Hanne Munkholm:
jeg endte
med at konkludere at det var flush af RAM der tilsyneladende "hængte"
systemet i intervaller, og det hjalp også en del at skrue på parametrene
/proc/sys/vm/dirty_background_ratio og
/proc/sys/vm/dirty_expire_centisecs.

Er der noget nyt i sagen? Er det endt på, at justeringer i ovennævnte er
tilstrækkeligt?

Hej Troels.

Ja det er dér jeg er endt. Der kan godt være en tendens til at I/O
"hænger" lidt stadigvæk, men ikke i en grad der gør maskinen ubrugelig.
Så vi har pt. ikke foretaget os mere. Maskinen i brug ;) Og det er
stadig langt hurtigere at køre noget på den, hvor det kan være i RAM,
selvom I/O performance måske ikke er optimal, end det er at køre det på
en maskine med mindre RAM og skulle dele data op i små bidder og skrive
og hente til og fra disk.

Så brugerne er holdt op med at brokke sig, næste chance for at
eksperimentere kommer med næste maskine af samme slags. Lige nu lugter
det af at der snart kommer én til.

Med venlig hilsen / Best regards
--
Hanne Munkholm                      Email: sslug@sslug
Systemadministrator                 Tlf: +45 35 32 13 49

Bioinformatik-centret
Københavns Biocenter, Biologisk Institut
Ole Maaløes Vej 5, 2200 København N


 
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