IMPORTANT: The Open Ephys GUI documentation has migrated to a new site – please visit https://open-ephys.github.io for the most up-to-date information.

CPU Meter

At the upper left of the main GUI window is a "CPU" meter. This is meant to indicate whether the system is being overloaded by processing demands. (This meters the CPU in your desktop/laptop, NOT the Opal Kelly FPGA inside the Open Ephys system.)

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To the right of the CPU and disk-full meters is a time, reported in ms. This time controls (but does NOT precisely present) the size of the buffer that Open Ephys GUI uses to process data. If you click on it, you can change this buffer size, which can either improve your overall processing load or make it faster (if more intense) for low-latency closed-loop work. There are more details at Acquisition board data latency .