Matthew and Robby, I just checked the memory usage of the windows 7 64 bit version of DrRacket (version 5.2.0.7--2011-12-23(188f868/a) [3m].) Despite the obscurity of the problem, the fix was made quickly. It works great. I checked both single and twin CPU usage.
The quick responses of PLT keeps amazing me. I can remember times (long ago) when it sometimes took half a year to convince and to prove to an expensive company that its system had a bug, let alone the time required to fix it. I know you are a team rather than a company, but nevertheless ...; I hope your funds for maintenance and further development of Racket and more profound scientific studies in informatics are not in danger. I am sure that, whatever expenses may be involved, the benefit for research and the world certainly exceeds the costs. Thanks very much. Jos -----Original Message----- From: Matthew Flatt [mailto:mfl...@cs.utah.edu] Sent: miƩrcoles, 21 de diciembre de 2011 19:36 To: Jos Koot Cc: users@racket-lang.org Subject: Re: [racket] cpu usage of DrRacket We tracked this down to a Win64-specific problem with the recent JIT switch from x87 to SSE for floating point --- now fixed. Thanks for the report! At Wed, 14 Dec 2011 13:52:05 +0100, "Jos Koot" wrote: > I see that after starting up, DrRacket constantly uses between 40 and 60 % > of my two CPUs, even with empty definitions window and before doing anything > by myself. > > I use: > Welcome to DrRacket, version 5.2.0.6--2011-12-10(6fae172/a) [3m] > without debugging and without preserving stacktrace. > Language determined by #lang line. > Disabling online expansion does not decrease CPU usage. > > What may be the reason for DrRacket to use so much CPU at moments I would > expect it to be idle? > Thanks, Jos _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users