I have two machines currently, a beefy Dual Xeon Supermicro PC and a Hackintosh 6-core 3930k DAW running Digital Performer 9.02. Audio interface is MOTU 424 card with a 2408mk3.
I could use some help diagnosing what looks to be a real time performance issue. I'm trying to play back a sequence at a 256 buffer. When it gets to a section of the music that's very active, the "Processing" bar in DP goes from barely there to being completely pegged solid red with dropouts and dragging tempo.
Here's what I've tried:
- I think I've eliminated the PC sample machine as being the culprit. The CPU does not get above 33% during playback with no dropouts or visible spikes of any kind. Also, running DPC latency checker while playing back the sequence hardly changes and hovers around 60us, stays in the green the whole time.
- Back on the DAW side, HW Monitor seems to suggest that the CPU is throttling down during the tough section. This to me suggests the bottleneck is not the CPU, it seems like something is locking the CPU so it can't process.
- In DP, I've eliminated all plugins. The only plugin that is active in the session is VE PRO.
- If I switch to a buffer of 512, all is well and the processing never spikes. I could stay here, but I'd really like to have a bit better latency. If I can diagnose the spike, my current CPU should be able to handle this no problem.
Is there anything like LatencyMon or DPC Latency Check for OSX? What steps am I missing for diagnosing the spike?
Edit: I'm only using one instance of Ve Pro as that seems to get the best performance, with a total of 34 channels of audio being sent back to the DAW. Also, the machines are connected via LAN directly, no switch in between.
Thanks for your time.