Are there any short term targets that will show benefit? Regards,
Matthew -------- Original Message -------- Subject: [Flightgear-devel] multi-threading / CPU usage From: James Turner <[EMAIL PROTECTED]> To: FlightGear developers discussions <flightgear-devel@lists.sourceforge.net> Date: 03/10/08 09:51 AM > On 3 Oct 2008, at 13:48, Matthew Tippett wrote: > >> Speaking of which, another call out for multithreading... The GPU >> isn't the limiting factor in our tests, the CPU is. Even mid-low end >> systems have 2-4 cores these days, and with the multi-display demo we >> are continually capped by one CPU. > > I have a long, long, long term plan to improve multi-threading > support, by enforcing subsystems to *only* communicate via the > property tree, which has light-weight locks thanks to some work by > Mathias. With a dependency graph between subsystems (which I want to > add for other reasons any way) it would then become possible to run > any 'clean' subsystem on a pool of worker threads (maybe just one, > maybe more). > > I'm sure there's some other locking that would be required for global > state (eg, the AIManger objects), and of course there's awkward cases > that will never be clean (especially instruments that touch the scene > graph) but it still seems a worthwhile goal. It'd be worth identifying > which subsystems are the big time sinks (FDM? AItraffic?) to > prioritise this. > > Another thing that would work well is to proxy all nasal script > invocations to a Nasal helper thread - again this assumes scripts > basically interact with the sim via properties (which they already do) > and that any system functions they call are thread safe - not very > hard to do. As more and more functions get moved to nasal, this might > become a very easy way to balance the CPU usage. > > James ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
