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Level 4

3,057 points

Logic 9.1.2 HT Quad i7 performance solution!

Just got that from AppleCare:

They are aware of the performance problem on certain machines in certain setups and working on a solution. However you can enable the virtual cores on all Quad Core machines with this commandline in Logic 9.1.2!

Open Terminal.app from /Applications/Utilities and copy the following line into the window and press return:

defaults write com.apple.logic.pro MD_AllowVirtualCoresQuad -bool yes

You can then quit Terminal.app. Relaunch Logic and you should have twice the number of processing threads.

Warning: this preference can actually lower your performance or have a negative impact on stability (e.g. you get audio engine overloads). In this case you can disable it by using the following line in Terminal.app:

defaults write com.apple.logic.pro MD_AllowVirtualCoresQuad -bool no

Posted on Oct 15, 2010 11:31 AM

46 replies

Chendry

Level 1

0 points

Oct 16, 2010 1:12 PM in response to Blueberry

Wow! Applying the preferences write under 9.1.2, my 2010 3.33 Hexa is now getting a solid 123 tracks on the Evan Benchmark! Haven't really put the machine through its paces on other projects so I can't comment on general stability, but it all seems pretty good to me so far. (Knocks on wood)

Oct 16, 2010 1:47 PM in response to Brglfnk

D'oh. I just saw the second "all" pref. Now I see all 12 cores.
You have got to be kidding on the power of this thing now.
6-core results with HT enabled: 110 Tracks!
Stability is still in question but time will tell. Thanks so much for the pref write.

Brglfnk

Level 1

20 points

Oct 16, 2010 3:02 PM in response to Chendry

So, despite the thread title, this is not a quad core issue only?

Oct 16, 2010 3:12 PM in response to Brglfnk

No, not just quad core. All machines started to dogpile in. It is a hyper threading issue. So if your machine supports HT then it is your issue as well. Performance seems to be somewhat erratic on the benchmark I get sometimes 110-125 Tracks depending on reboot and launch states. Logic is still not scaling perfectly but it is very much improved.

spheric

Level 3

699 points

Oct 16, 2010 4:29 PM in response to BoyHowdyDoo

So I think it's safe to say that yes, Apple are very much aware of the situation, and while this update has fixed some of the models' issues, they're definitely still working on it.

I assume the .plist pref is there because it's being worked on, but not set by default because it's not entirely ready for prime time.

yildox

Level 1

48 points

Oct 16, 2010 11:54 PM in response to spheric

I have a question for you all .
I have just entered the magic line in the terminal but when I hit return this is the answer I am getting
-bash: com.apple.logic.pro: command not found

? Am I doing something wrong boys ?

yildox

Level 1

48 points

Oct 17, 2010 12:30 AM in response to yildox

Like with the HT working in L9.12 shouldn't 4 bars show up in the processor window instead of 2 ?I ask again am doing something wrong ?

Pancenter

Level 6

14,644 points

Oct 17, 2010 1:37 AM in response to yildox

I got the impression the mobile i7 does not behave the same as the desktop i7's, it's a different processor.

pancenter-

spheric

Level 3

699 points

Oct 17, 2010 2:10 AM in response to Pancenter

The desktop i7 is a quad-core with hyperthreading.

The laptop i7 is a dual-core with hyperthreading.

Oct 17, 2010 8:39 AM in response to Bee Jay

Bee Jay wrote:
Mike - so does 9.1.2, with whatever necessary options enabled, completely satisfy your long-standing gripes about multicore performance now? In other words, is it all good for you now?

I want to test it more, but so far it has been a vast improvement in performance and stability has been just fine. Assuming it stays this stable in regular use, I'm extremely happy with it.

Brglfnk wrote:
So what's this mean for folks looking to buy a new Mac for Logic? Is the increase in functional cores enough to put the new 2.4 octo ahead of the 3.2 quad? Is the hex now a better option?

There should be plenty of benchmarks being done (if they haven't already). The hex should be faster than the 2.4 octo, hard to say about the 3.2 quad. I got my 2.4 octo up to 112 tracks on the benchmark.

So at this point do we know for sure either way if this helps on the i7 laptops?

Brglfnk

Level 1

20 points

Oct 17, 2010 10:44 AM in response to Mike Connelly

Mike, since you’ve been leading the charge on this I’m taking that as authoritative as it gets. It now sounds like any of the new Mac Pro lineup ought to run Logic efficiently. This is a win for Logic users, music, this forum … and Apple itself … at least one customer frozen in the midst of transitioning to the Mac from the ‘dark side’ can now make that commitment with confidence. Thanks again to you, Blueberry, AppleCare, the developers, and the others who made this happen. To have a happier ending, we’d have to be pulled out of a hole in the ground in Chile… 😉

Message was edited by: Brglfnk

Oct 18, 2010 7:09 AM in response to Bee Jay

Bee Jay wrote:
Mike - so does 9.1.2, with whatever necessary options enabled, completely satisfy your long-standing gripes about multicore performance now? In other words, is it all good for you now?

One thing I did find out - looks like the 12 core machines only use 16 cores after changing that setting instead of all 24. So it looks like apple still has some work to do, but at least it seems like things are heading the right direction.

Tommykry

Level 1

0 points

Oct 18, 2010 10:26 PM in response to Mike Connelly

Hi all, sorry im not up on all this stuff, my 2 macs are:
Imac 20" duo core(not duo core 2) 2.0mhz osx 10.5.8 (Mid 2007) and
White 13" macbook 2.13ghz (last one with firewire 400)osx 10.5.8(july 2009)
Will the 9.1.2 update affect my macs?
Thanks,
Tommy

Oct 19, 2010 4:14 AM in response to Blueberry

is it possible to fix HT on the "32-Bit Audio Unit Bridge"?

Oct 19, 2010 6:10 PM in response to Tommykry

Your Mac's do not have hyper threading . Performance should remain the same. So you get bug fixes. That's a plus:)

Logic 9.1.2 HT Quad i7 performance solution!