MonetDB: default - allow fixed number of partitions using --set ...

Niels Nes Niels.Nes at cwi.nl
Sun Dec 2 12:19:48 CET 2012


On Sun, Dec 02, 2012 at 12:03:54PM +0100, Fabian Groffen wrote:
> On 02-12-2012 11:51:30 +0100, Niels Nes wrote:
> > Changeset: 6e166ce6744e for MonetDB
> > URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=6e166ce6744e
> > Modified Files:
> > 	gdk/gdk_utils.c
> > 	gdk/gdk_utils.h
> > 	monetdb5/optimizer/opt_mitosis.c
> > Branch: default
> > Log Message:
> > 
> > allow fixed number of partitions using --set mito_parts=?
> 
> isn't this the same as --forcemito + gdk_nr_threads=?
no. That sets the number of threads and for small table still enables
mitosis. But this allows setting the number of created partitions. 
Its a hack to experiment and test more optimal (nr) of paritions and/or
partition sizes.

Niels
> 
> -- 
> Fabian Groffen                              fabian at monetdb.org
> column-store pioneer               http://www.monetdb.org/Home



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-- 
Niels Nes, Centrum Wiskunde & Informatica (CWI)
Science Park 123, 1098 XG Amsterdam, The Netherlands
room L3.14,  phone ++31 20 592-4098 	sip:4098 at sip.cwi.nl
url: http://www.cwi.nl/~niels   e-mail: Niels.Nes at cwi.nl
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