Let's see the timing with the two done in reverse order. OS cache could account for some of that difference.
Blake McBride
On Tue, Apr 22, 2014 at 5:05 PM, Eliot Miranda eliot.miranda@gmail.comwrote:
Hi All,
I should write a blog post on this, but I can't wait...In recent days I've written a script to build a Cog VMMaker image from Squeak 4.5. See http://www.squeakvm.org/svn/squeak/branches/Cog/image. This has allowed me to run the current Cog VM against Spur side-to-side.
To build a Cog VMMaker image on my 2.2GHz Intel Core i7 MacBook Pro using the current Cog VM takes about 2 and a half minutes:
McStalker.image$ time oscfvm CogVMMaker.image BuildSqueak45Image.st real 2m30.671s user 2m15.683s sys 0m5.283s
To build the equivalent image using Spur takes about 1 and a half minutes: McStalker.image$ time spurcfvm CogVMMaker-spur.image BuildSqueak45Image.st real 1m34.943s user 1m23.666s sys 0m6.810s
Comparing:
94.943 - 150.671 / 150.671 * 100 -36.99 83.666 - 135.681 / 135.681 * 100 -38.34 150.671 / 94.943 1.59 135.681 / 83.666 1.62
that's about a -37% speedup, or 1.6x faster.
best, Eliot