Does simh use threads to handle MP processors? I have other SIMH versions (vaxmp and turbovax) that uses threads to take advantage of CPU cores.
I looked through your 782 code and did not see any threads handle that vaxmp and turbovax uses. Tim -----Original Message----- From: Simh <simh-boun...@trailing-edge.com> On Behalf Of Matt Burke Sent: Saturday, April 6, 2019 6:18 PM To: simh@trailing-edge.com Subject: Re: [Simh] VAX 8200/8250 On 06/04/2019 21:28, Timothy Stark wrote: > I was surprised to see that! Very good news!! Good job! I will try that > soon. > > For 8250/8350, you need two MP processors. Does vax820 emulate two MP > processors like VAX-11/782? > No, but I have got another branch which does. It's a fairly nasty hack just to test the theory. Basically the two processors are run in lock-step and it saves/restores the context of each CPU between instruction cycles. There's a lot of overhead in that so the performance is quite poor once you start the secondary CPU. Bob Supnik created a simulator for the SiCortex SC1 several years ago which shows a better way to do multiple processors in lock-step but that would involve significant changes to the VAX CPU and MMU modules. Matt _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
