Is Apple's new 8-core Mac Pro compatible with the UAD-1e?
Some users are experiencing problems with Apple Mac Pro computers and Logic 8, when used with UAD Powered Plug-Ins. The problems manifest as CPU spiking, and occasional halting of playback. They seem to occur more often on the 8-core model. We have determined that this problem stems from the unique way in which Logic 8 treats plug-ins on a track with no audio currently passing through it. We are currently examining workarounds but have no definitive solution at this time. Please note that other hosts besides Logic 8 work fine with UAD-1e on the Mac Pro models, including the 8-core.

Biensur tu as le dernier Uptate Logic qui date de quelques jours? 8.1.2 Je te vois parler de la version de Logic alors je te propose ça.

et que dit la conso CPU de tes Xeon… ce que je veux dire, c'est que les cartes à dsp type UAD pompent aussi dans la puissance de l'ordi. Un bypass des plugs UAD devraient donner une indication

52 pistes audio, voir en fait 104 si les pistes sont stéréo....ça commence à faire pas mal pour un disque dur,
si c'est un Raptor à 10 000 t/m OK, .....mais pour un basic 7200 t:m.....ça peut coincer...

Si tu peux, essaye de dispatcher tes fichiers audio sur plusieurs HD. Ne jamais oublier qu'il suffit qu'un fichier soit fragmenté pour que sa lecture en patisse, alors si tu essaye de lire 52 fichiers en même temps avec peut être plusieurs qui sont fragmentés, les soucis arrivent très vite et si en plus tu rajoutes un traitement en temps réel via des plugs alors là les soucis sont inévitables.....
Et aussi re-organise la mémoire de ton projet dans Logic et vide sa corbeille, dans bien des cas cela aide pas mal...
De plus j'ai remarqué que si tu utilises un environnement (celui de Logic) assez lourd et compliqué, ça suffit à le freiner pas mal...

Tiens nous au courant en tout cas , car comme toi je suis sur Macpro 2,66 et sur UAD...
Cordialement....

Re: Best setup for Logic 8 and Intel Mac
by sebastian1 on Thu Jul 10, 2008 9:17 pm

I have similar problems on 10.4.11 , Logic 8.02, 1 UADe, 4 core 2Ghz intel Mac.
When card performance hits aprox. 20-30% I start to get spikes, cpu ol errors etc.

Problems seem to get worse the more UAD plugs are used on buses, auxes, outputs or input channels.
Also combining UAD plugs with latency-causing Pi's like "linear phase EQ" in one channel strip might be a problem. To me somehow It all seems to be related to latency compensation.

I am a very experienced power user and I've tried every setting you can imagine.
I don't think this is an OS related issue - to be honest I've given up hope to resolve this...

I don't blame UA but it seems there is a certain incompatibility with intelmacs in general.
I am about to check if i can replace the beloved UA plugs with Waves API/JJP... I hate to say this,
but a reliable system is more important to me than (maybe) the 5% of quality loss .

Here are some things you can try to improve performance...

LOGIC SETTINGS:
You can adjust the CORE AUDIO settings in Logic. You should try changing the 'Process Buffer Range' to Large. This is suggested by Apple.
http://docs.info.apple.com/article.html?artnum=304970


UAD CONFIGURATION SETTINGS:

Under the UAD Performance Meter/ UAD Configuration... Set the UAD Configuration 'Force Logic LIVE mode'. The 'Force Logic LIVE mode' should be used whenever you want to add UAD-1 plug-ins on tracks in Logic while recording midi/audio parts instead of just at the mix stage.

Here are some things you can check in your system. Make sure that your audio interface buffer settings are at a minimum of 512 (or try 1024). Lower settings will cause jitter and audio artifacts. Experiment with MIN_GNT settings in the UAD Meter / File / Configuration. The MIN_GNT adjusts the priority of the PCI bus and may help to 'integrate' the UAD with your host app. Try to increate the MIN_GNT setting from 64 (default) to 128. NOTE: Make sure you do this with your audio application closed... Once you make the adjustment open the audio application run a session and see if this helps. If it does not help you can try adjusting the other way (decrease MIN-GNT value). Don't forget to close the audio application...THEN make the adjustment to the UAD...THEN open the audio application again. If moving the value UP or DOWN negatively effects your system then go back to the default value of 64.

I also received the following from a Logic/UAD user.. ' The i/o safety buffer was set on.... when I turn that one off it all got ALOT better'

Hello,
I am sorry you are having these problems. We realize that there has been numerous issues with the use of Mac Pro systems (8 core and 4 core) specifically with Logic Pro 8 (some users report less problems with Logic Pro 7...but still higher than normal CPU metering levels). These problems have been noted and we have posted warnings about the issues. Unfortunately there is no solution for Logic users are this time...thus our warning not to use this configuration. We have found that these problems can be solved in other host applications... mainly because in these other applications the user can manually limit the number of cores being used. The problems seem to be centralized on the host applications ability to manage the UAD DMA based DSP card along with all the other tasks, in conjunction with these new multicore Intel based Mac systems.

The suggestions I have sent you are only attempts to optimize performance on systems we know have shown to be problematic. I can only offer apology for the inconvenience as we do not have a specific solution at this time.

(pour répondre a kubrik)
En même temps, dans les autres sequencers ça ne marche que si tu désactives une partie des cœurs (si j'ai bien lu)
Alors avoir un 4 ou 8 cœurs pour le faire fonctionner a demi régime
ça donne du leste d'un coté pour brider de l'autre, c'est pas non plus l'ideal

Il est temps qu'ils le prouvent en délivrant des mac et surtout des softs sans Bugs.....

Reste que je suis comme un con avec mes cartes à 2500 boules + qques suppléments en logiciels, moi...

Fait chier d'être le cochon de payant, des fois...

Donc, voilà : soit je vire Logic (arf), soit je vire le MacPro (heu...), soit je vire les UAD-1 (faiche).

Vous feriez quoi, vous ?