I suppose I could try llvm for Linux, I'm not sure if that exists on a Mac. But gcc is what I know. And it seems to do a pretty good job optimizing. For one thing, a lot of people (a number of them Intel employees) have worked hard on the Intel back end. paul On Aug 10, 2012, at 3:58 PM, <hvlems at zonnet.nl> wrote: Is gcc the only option you've got Paul? Gcc must satisfy a lot of terget platforms, may be optimal gets defined differently? -----Original Message----- From: <Paul_Koning at Dell.com> Sender: owner-hecnet at Update.UU.SE Date: Fri, 10 Aug 2012 18:37:47 To: <hecnet at Update.UU.SE> Reply-To: hecnet at Update.UU.SESubject: Re: [HECnet] AXP Emulation Yes, the makefile sets the optimize flags. It tells it to optimize pretty hard, but I'm redoing some tests with a later version. I'm also going to try (first time I've done that) profile directed optimizing. The simh code at one point used inline, but not any longer. It may be relying on recent compilers to do that automaticallly, I'll find out. paul On Aug 10, 2012, at 11:51 AM, <hvlems at zonnet.nl> <hvlems at zonnet.nl> wrote: Paul, so the makefile sets the compiler flags, right? So it might be worth figuring out how much effort the compiler puts in optimizing its output. Windows is a relative of vms, an ugly cousin but still family. Its growth is stunted, Windows 7 is the fifth version after W 3.5. VMS grew a lot faster, with more (end user) functionalty, more stability during its first two decades. Even then Windows 5.1 (aka XP) is stable and useful. Vista wasn't then again VMS 6.1 wasn't that mature either... Hans -----Original Message----- From: <Paul_Koning at Dell.com> Sender: owner-hecnet at Update.UU.SE Date: Fri, 10 Aug 2012 14:28:45 To: <hecnet at Update.UU.SE> Reply-To: hecnet at Update.UU.SESubject: Re: [HECnet] AXP Emulation In my case, gcc with the default makefile. I don't use VC (or the OS it runs on) unless serious force is applied... paul On Aug 10, 2012, at 3:02 AM, <hvlems at zonnet.nl> wrote: How was simh compiled? I used Visual C and the difference between running the compiler with optimization on or off made quite a difference for the generated code. And gcc might compile even faster codefiles. Hans -----Original Message----- From: Sampsa Laine <sampsa at mac.com> Sender: owner-hecnet at Update.UU.SE Date: Thu, 09 Aug 2012 23:07:24 To: <hecnet at Update.UU.SE> Reply-To: hecnet at Update.UU.SESubject: Re: [HECnet] AXP Emulation Why is SIMH so slow though? As far as I can understand, one MIPS is roughly one VUPS, correct? So how come I get 14 VUPS on the same host running SIMH whilst my Hercules install peaks at 180? Are the architectures that different (obviously they are) or what is it? Sampsa