[HECnet] SIMH performance on OS X vs Linux

[sampsa at mac.com]

3.7-1 on OS X, 3.9 on the Linux ones - might explain the difference.

Ohhhh, just did a 'file' on the binary I've been using (it worked so didn't feel the need to compile a new one):

bash-3.2$ file simh-vax 
simh-vax: Mach-O executable i386

In any case, I don't mind the overhead of the small Linux VM underneath them and they will soon all be on a large-ish server in a colo rack as I sell my apartment. Sampsa might leave London, but SAMPSACOM stays behind :)

sampsa


On 31 Dec 2012, at 21:41, Cory Smelosky <b4 at gewt.net> wrote:


On 31 Dec 2012, at 14:40, sampsa at mac.com wrote:

On 31 Dec 2012, at 20:46, Cory Smelosky <b4 at gewt.net> wrote:


On 31 Dec 2012, at 08:26, sampsa at mac.com wrote:

I noticed that Linux SIMH is about twice as fast on OS X.

KUHAVX got about 12 VUPS when running natively on a Core i5 iMac, 24 when in a Linux VM on the same hardware. Pretty weird.

Really?   I've gotten 20 VUPS on both.

Which version of OS X?


10.7.5 (Darwin 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64)

and

10.6.8 (10.8.0 Darwin Kernel Version 10.8.0: Tue Jun   7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64 x86_64


Interesting.

Which version of SIMH and do you remember to SET CPU IDLE?

--
Cory Smelosky
http://gewt.net/ Personal stuff!
http://gimme-sympathy.org/ My permanently-a-work-in-progress pet project.