On Fri, Apr 30, 2010 at 01:33:08PM -0400, dariuszs wrote:
Hi, On processors that support SMT technology if Logical Processors are enabled your software segfaults,
Could you be more specific and verbose? Does "it" (I suppose you mean MonetDB, in particular MonetDB5/SQL) segfault always (i.e., as soon as you start mserver5 or merovingian), or only under particular circumstances/workloads/situations? I.e., how (if at all) could we reproduce the segfault(s)? (We cannot do much about problems without detailed description how to reproduce them ...) In case we cannot reproduce the segfault, can you run MonetDB in a debugger and report where/how/why it segfaults?
if you disable Logical Processors it works but then you use half of the available memory. Dariusz.
How exactly do you come to the conclusion that MonetDB only uses half of the (physically) available memory in case Logical Processors ("Hyperthreading") are disabled? How are Logical Processors related to physical memory usage? Stefan
Martin Kersten wrote:
Nafees Ur Rehman wrote:
Hi,
Does monetdb has support for parallel processing? If some can guide me on that.
What kind of parallel processing do you have in mind? It runs the queries in parallel on a multi-core engine. regards,Martin
Regards Nafees Ur Rehman
-- | Dr. Stefan Manegold | mailto:Stefan.Manegold@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 |