[Monetdb-developers] About monetdb's thread

kun ren renkun.nwpu at gmail.com
Fri Jul 30 03:42:21 CEST 2010


Thanks, professer Stefan.I will do my exprierment on linux.

2010/7/29 Stefan Manegold <Stefan.Manegold at cwi.nl>

> Hi Kun Ren,
>
> we do not know of a simple way (e.g., system call) to find out the number
> of
> CPU cores on a Windows system, hence, we set the default number of threads
> in the MonetDB kernel to 1.
>
> You can overrule this by starting mserver5 with an extra command line
> option
> "--set gdk_nr_threads=<N>" or adding a line "gdk_nr_threads=<N>" to you
> monetdb5.conf file.
> In either case, <N> shoudl be the number of threads you'd like to have
> (should not be larger than the number of CPU cores).
>
> However, we do not know how well the multi-threading works on Windows. We
> rely on pthreads, and their implementation on Windows might not be as
> efficient and/or stable as on Unix-like systems ...
>
> Hope this helps you further ...
>
> Stefan
>
> On Fri, Jul 23, 2010 at 09:33:21AM +0800, kun ren wrote:
> > Dear all,
> >    hello,all, I download the windows installer of monetdb,and install,and
> > then start MonetDB server, my computer has 4 cpus.and with 32bit windows
> xp
> > ,but the MonetDB server only start one thread.when I run MonetDB in Linux
> > with 2 cpus, it start 2 threads. so why? why I am in Windows xp with 4
> cpus,
> > it only create 1 thread ?
>
> >
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> --
> | Dr. Stefan Manegold | mailto:Stefan.Manegold at cwi.nl |
> | CWI,  P.O.Box 94079 | http://www.cwi.nl/~manegold/  |
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