Re: chekcpoints, BUFFER settings, and optimization
In article <66madi$osk@cssun.mathcs.emory.edu>, Serafim Fonseca
<inf@dpx20.growela.pt> writes
>}
>} In article <881611278.1353908229@dejanews.com>,
>} jneugebauer@ameritrade.com writes
>[...]
>
>
>David Williams writes
>
>[...]
>} ># Shared Memory Parameters
>} >
>} >LOCKS 100000 # Maximum number of locks BUFFERS 5000 # Maximum number
>}
>} BUFFERS 5000!!
>} Run onstat -b and look at the last line it will end in page size
>} either 2048 bytes or 4096 bytes (2 or 4K).
>}
>} I would up BUFFERS by 100Mb and run sar -p 1 1 / sar -q 1 1
>} make sure you are not getting paging/swapping. Keep on increasing
>} by 100Mb unti paging starts then set it to the highest value which
>} has no paging.
>}
>} Run onstat -g ath. Are there kaio threads running. If so set
>} NUMAIOVPS=1. Otherwise increase NUMAIOVPS to the number of disks you
>} have (up to 32).
>}
>} Set cleaners = 6 (same as NUMCPUVPS). Page cleaner threads only queue
>} i/o (pass it to kaio threads or AIO VPs) they do not actually do the
>} I/O.
>}
>
>Is this a rule? To have the same number of cleaners as the number of
>NUMCPUVPS.
>My machine has 1 NUMCPUVPS and I've CLEANERS=8 should I change that?
>
Yes, cleaners threads run on cpu vps. Hence with 1 CPU VP only 1 can
be active at any one time. More than 1 is a waste of time.
>
>Thanks
>Serafim Fonseca
>
>
>==========================================================================
> Serafim Fonseca e-mail: sf@growela.pt
> Growela Portuguesa Calcado, Lda. phone : +351 2 9866300
> S. Pedro Avioso, Castelo fax : +351 2 9812212
> 4470 Maia - PORTUGAL
--
David Williams