Source link: http://vdrums.com/forum/showthread.php?54703-Latency-Checker-for-MAC
Source date: November 25 2009, 02:33 PM
Checking DPC Latency Checker, I can see spikes at regular intervals when everything's standing still, and whenever I try to do something as simple as open or close a window, I get brutal spikes. Unfortunately they shows about the same DPC Latency behavior as before. So for critical Audio work you still have to fall back to the 'Standard VGA Drivers'. PS: Curiously the new driver version of the Broadcom drivers resembles what OS X reports as 'Firmware Version: 5.10.38.24'. Solving DPC Latency issues. Updates for some processes/drivers are often delivered via Windows Update. It's recommended that you ensure that your version of Windows is fully up to date should you encounter any DPC problems, you can update Windows by following these steps: Windows 7: Go to Start Programs Windows Update click 'Check for.
It would be nice if there were a Latency Checker similar to the DPC app but for MAC’s. If your a MAC user how do you check/compare latency for different setups? For instance, I would be curious to see the effects on latency using different settings in VST software and hosts or seeing the differences in built-in sound solutions as opposed to an external audio interface. Using a MAC is there an app for that or somewhere to compare numbers?
DPC is just providing kernel information from what I can see there’s no round-trip latency analysis.Apple provide their development IDE (Xcode) as an optional package on the OSX installation DVD. It includes a profiler called “Instruments” which appeared with Leopard that has “Templates” for analysing performance of applications including attaching to existing running processes.With Snow Leopard (Xcode 3.2) theres more tracing templates that you can do the normal profiling and also analyse efficiency of using multiple CPU cores for example.The profiling allows you to see where the application is spending the majority of it’s time for each thread, for each framework, etc.Is it MIDI->sound latency that you’re interested in? It is may be possible to make an application that creates a MIDI “ping” then listens for the audio output from the audio driver.
[tester app] — MIDI note –> { app to be tested } — Audio sound output –> [tester app]
Oddly I’m coding up a MIDI application for OSX and I will need to measure the latency by having the user hit when prompted for 10 hits then measure the time it takes to receive it (through the TD6V and then OSX). Only started today but have the TD6V talking to my application already.
Would need to look at the audio as Apple may prevent output being redirected to an application for copy protection
From another source (http://forums.macrumors.com/showthread.php?t=911502), dated Feb 24, 2011, 12:45 AM:
From a trivial amount of searching I already know that DPC is a Windows-only term. Since that particular way of working with drivers only exists on Windows, it is meaningless on MacOS.
What you really want for audio applications is to keep the latency down. MacOS has always been a strong platform for audio because they keep some real-time features around for things like this. Note, MacOS X is not a true real-time OS (there is no hard guarantee of latency and processor slices), but only has a few features from that set.
You need to actually try out your workflow on MacOS, and prove that it works for what you need it to. There is no single metric that is going to work like that.
The easiest way to do this is to
1. Get a small mixer. Behringer makes a few under $60.
2. Take the stereo output of your mac and feed it into channels 1 and 2 of your mixer.
Dpc Latency Checker Tool Windows 10
3. Plug in your guitar, mic, or line level input that you want to record into ch. 1 of the mixer. Keep the panning on this channel at center and then take one of the stereo outs of the mixer and feed it to the audio in of your mac. Be sure to let the mac or your DAW know that your input is now line level.
4. Now, in your DAW (in your case, garage band) mute the track you are recording to so that all that’s coming to ch. 2 and 3 of your mixer are the tracks already recorded as well as the click.
If, when clicking on “Check for Updates”, you get the message “Windows update cannot currently check for updates because the service is not running. You may need to restart your computer.”, here is a possible solution for the problem.
Dpc Latency Checker Online
1. On the left side of the Windows Update window, click “Change settings”.
2. Change the setting under the Important Updates from “Install updates automatically” to “Never check for updates”, or vise versa, depending on your setting.
3. Click Save.
4. Go back to the main Windows Update window and click “Check for Updates”. Problem should be solved.
5. Optional – The Important Updates setting can be changed back to the original setting.
Computer details:
Dpc Latency Windows 10
OS: Windows Vista Home Premium SP 2
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