Mac vs Win => 52% faster on Mac *** fixed in v3 ***

[Zom-B]

Ok guys...
something that really shocked me hard after I just tested the Mac Build of 2.4.8:

Win 4x3GHz => 179k sps
Win 2x2.8GHz => 94k sps
Mac 2x2.8GHz => 143k sps

I used latest 2.4.8 beta on Vista 64 vs Mac OS 10.5.
Render Mode was pure PT, without fancy extra stuff.
iMac with Bootcamp is the 2x2.8Ghz machine.
3x3Ghz is a AMD PC, that scales fine with results of iMac@win !

2 possibilities for this I could imagine:
1) Mac Build is buggy and does faster samples by taking "shortcuts" that result in biased rendering
2) Win Build was compiled badly since a long time, and wastes a lot of potential!

Please investigate here! A "fixed" win build would give us a +52% speed bonus
without any new crazy scientist stuff to be integrated!!!

[Godzilla]

Could you send the scene to me? I have a similar processor to the one you used in your test (4 x 3.4Ghz) and I'm running windows.

[pixie]

Fix fix fix!

[Zom-B]

Could you send the scene to me? I have a similar processor to the one you used in your test (4 x 3.4Ghz) and I'm running windows.

you got PM

[Godzilla]

2.4.7-
4m 16s, 410.41 SPP, 420k S/S

2.4.8
4m 13s, 271.30 SPP, 280k S/S


Not really a noticeable difference in noise, but some weird artifacts appeared on the 2.4.8 (And some artifacts disappeared from the 2.4.7 version).

Run on Windows 7 using a 3.38 Ghz Quad-core (Intel Q6700).

[Zom-B]

in mac vs win test you also see difference in noise!!
Here samples are way higher for 2.4.7, also new artifacts on the left side of the chrome bold.

[lycium]

new crazy scientist stuff

Well, this will definitely be looked at today!

[fused]

new crazy scientist stuff

Well, this will definitely be looked at today!

Lol, your turn mr. Ludwig. I just made indigo 170% faster.

roflcopter

[lycium]

Lol, your turn mr. Ludwig. I just mad indigo 170% faster.

roflcopter

Do it for the Windows build

[fused]

Do it for the Windows build

Uh.... I currently have other stuff todo, err.... or so.

[fused]

We have tested it on our office mac (2x2.4 Ghz) and we can confirm:

Win7: 95k samples/s
OSX 10.6: 123k samples/s

edit:
comparing indigo console:

Win7: 99k samples/s
OSX 10.6: 144k samples/s

edit 2:
2.4.7 vs. 2.4.8 on Win7 (no GPU):

2.4.7: 89k samples/s
2.4.8: 99k samples/s

[Zom-B]

Ok, I justed re-benchmarked my Win 2x2.8 System, with higher sps -.-
So the total Speed gain "dropped down" to +53%...
Sorry for that, I updated the first post!

Maybe somebody could do a Win vs Linux Benchmark on the same machine?!

[lycium]

I did a Win vs Linux benchmark back in 2.4.4 days or so, with Linux running in the VM, and it was still faster. Don't remember by how much, but the take-away point is that GCC is kicking Visual C++ compiler really hard!

We've done some tests at the office with different compilers and are considering making a change there, since 50% is really worthwhile (and it would be nice to use a single compiler on all platforms).

[Borgleader]

I did a Win vs Linux benchmark back in 2.4.4 days or so, with Linux running in the VM, and it was still faster. Don't remember by how much, but the take-away point is that GCC is kicking Visual C++ compiler really hard!

We've done some tests at the office with different compilers and are considering making a change there, since 50% is really worthwhile (and it would be nice to use a single compiler on all platforms).

w00tles I'm assuming this speed upgrade has chances to boost the GPU beta too?

[Zom-B]

I'm assuming this speed upgrade has chances to boost the GPU beta too?

This is something I hope too!
Also the GPU integration of BiDir could be retested after updating the compiler.
The OpenCl render Mode could benefit too!