[LG Optimus 2x] TrymHansen:
HOW TO USE:

In its simplest form, the app is a benchmark. You start a CPU-test at a specific frequency for a specific time-period and get the average Mflops-result. If you are going to compare different kernels, it will give you a normalized to 1Ghz result as well. Different kernels usually have different frequency-tables, so test them at the closest steps you can find, then compare the normalized result.

The more useful aspect of it is to test if a specific frequency is stable at a specific voltage. The app only allows to test the frequencies in the voltage table - because if it is stable at those frequencies it will be stable at all other frequencies which fall within those voltage-steps. If you have undervolted too much, the phone will usually reboot pretty quickly. If you have undervolted "on-the-edge", the phone will likely freeze. If you have undervolted so that it is basically stable, but sometimes fails, you'll either get a crash to the desktop or MTT will inform you of a calculation error. If you are testing for stability you need to test for at least 60 minutes to have any confidence in the result, I've had several tests fail after 45-50 minutes.

It can also be used to see what impact, if any, undervolting has on the processors' power-consumption. After you have made sure a frequency/voltage-pair is stable, you can run a battery-test and compare it to an identical test at stock voltage. This will simply run from a full(ish) battery to a certain battery percentage, and give you how long it was able to run. Since the battery-percentage is pretty loosely coupled to the actual battery-charge, it will also give figures for consumption per minute or second. This kind of test should also be run over a long a period as possible to get accurate results. Measuring from 100% to 90% will only give you an indication, prone to error. You can not compare a test between, say 100->50 and 100->20, because the discharge rate varies with the charge-level.

For most accurate testing and benchmarking: enable flightmode, unplug the device, freeze any apps which may run in the background, uninstall everything you don't need, wait 3 minutes after booting before testing, do not touch the screen or move the device while a test is running. Even then there are Android quirks which will cause some variation in the results. Therefore the same test should be repeated as many times as you can afford.

The major enemy of stability, assuming you have enough voltage, is heat. Make sure to test the device under the same conditions as it will be used. If you're going to overclock on a hot summer's day, test it on a hot summer's day. MTT dims the screen to minimize the impact it has on the battery and heat-generation, be aware that your device will be hotter when the screen is at normal brightness.

Stability tests should also be performed at different battery-levels. If your device is stable when the battery is fully charged, it does not automatically mean it will be stable when it is almost discharged.

MTT logs all succesfull tests (max 200 lines.) If you enable "Store log on sdcard" in preferences the log will be saved to /sdcard/MTT_Log.txt.