Cpu Or Hard Drive Speed?, Trouble w/ Logic Options

[whickus]

I love using Logic, but I'm having trouble with it lately. When doing projects in 24bit/96KHz with about 3 audio tracks and 5 instrument tracks my Audio meter (on the Logic system performance gauge) goes into the red, but the CPU meter is at less than half. About half the time it'll actually overload and stop. Here's my setup:

Dual 867 G4, OS 10.3.5, 768MB ram, Logic Big Box 5.5, seperate 7200 rpm 40GB ATA/100 hard drive for audio files.

I know Logic Big Box (same as Logic Express) does not take advantage of dual processors, but it seems like a single 867 G4 should be able to handle more than 3 audio tracks and a couple instruments.

My question is: Is my problem the hard drive or CPU or something else? Just wondering if anyone has any suggestions.

Thanks for any help.

[lepetitmartien]

I've spoken to Emagic and they say Big Box and Express don't have "Multi Processor Support" (it also says this on their website). How would OS X use both processors in this case?

I don't know what emagic has done, but processor usage is MACH kernel in the Core OS X matters, it's no application business as it was in OS 9. I don't see the benefit of doing so (if it's possible, the guy at emagic may be wrong But if it's the case it's clearly to bother users by actually limiting the power they can use on their computer, which is baaaaaaad. Not that Digidesign does that with protools and the coreaudio driver, which from an Mbox to a $300000 system can't play itunes while having a Protools session open… mad!

Ooops… I wans ranting… and I've browsed emagic website in the logic flavours comparison charts… You're right.

Shame on them! you're usung only one processor. :sad which means your logic scramble the raw power for a goal, thanks emagic!

That explains par of the problem.

"Also, have you disabled journaling on the drive hosting the files? If not, you SHOULD."

How do I go about doing this and what is the benefit?

Journalling is a OS feature, it's a way to manage hard drives (especially ones with sensitive data on, or your system drive.

Journaling permits in case of crash to return to a previous "healthy" state of the drive to minimize consequences. The trade-off is that performances are slightly lower but it's more prone to be seen on disk intensive operation. Digidesign warned officially to not journalise drives where you are working on midi/audio and keep the system elsewhere on a journaled drive.

Now, journalising is decided when you format the drive. To start it or stop it after that, open the Apple Disk Utility, select the drive and press the relevant button on top right.

The processor stuff explains a lot… Now maybe journalling is on on the relevant drive (keep it on the system drive), but there can be also another reason… If you never let your computer on all night too, it wont run its BSD clean up routine, trash the logs, etc. Also each time you install something, whatever it is on OS X, repair your authorizations!!!!!!!!!!!!!!!!

To repair authorizations, use the disk utility.

And to run the scripts for maintenance, you can do so with MacJanitor, you can leave your computer on one night a week. But you can use OnyX (download) which is free and allows you to tweak a few other things. Xupport which is a shareware as even more tricks in its bag.