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 ? > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > Monetdb-developers mailing list > Monetdb-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/monetdb-developers -- | Dr. Stefan Manegold | mailto:stefan.maneg...@cwi.nl | | CWI, P.O.Box 94079 | http://www.cwi.nl/~manegold/ | | 1090 GB Amsterdam | Tel.: +31 (20) 592-4212 | | The Netherlands | Fax : +31 (20) 592-4199 | ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm _______________________________________________ Monetdb-developers mailing list Monetdb-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/monetdb-developers
