V6 User Manual 1.00.book - Studio General

The Profiling WindowThe profiling window contains the parameters used to fine-tune the performance of hard disk accesses for Pyramix.These parameters are not intended for user modifications, and Merging cannot guarantee the proper functionalityof Pyramix when modifications are made in this window.VS3 Profiling windowCache lengthThis is the size of the playback buffers allocated in the host PC’s RAM. Pyramix allocates one buffer per track. Whenthe audio playback is started, all the buffers are completely loaded by reading the data from the hard disk beforethe actual playback starts. Increasing the buffer size offers the benefit of a larger immunity against short term harddisk access stalls and other operating system slow-downs at the cost of longer latency at initial playback start.ThresholdDuring playback, the audio data is read from the playback buffers, which are thus progressively emptied. Whenthe amount of data in a buffer falls below the threshold value, new data is read from the hard disk to refill thebuffer.Request sizeThis parameter determines how much data is read from the hard disk when the threshold level is reached. Oneoption is to completely fill (To Cache Length), the other option is to load a defined amount of data (Bursts of).Stall ThresholdWhen the amount of data falls below the stall threshold, this means that the system has serious performanceproblems. Playback will be temporarily stopped, while a stall warning is issued.Round loops to Video FramesThis option, which is enabled by default, rounds the start and the end point of a playback loop to complete videoframes. The start point will always be rounded down, and the end point will always be rounded up, so that theloop will always contain at least the initial range intended for the loop.Record cache lengthTroubleshooting : The I/O Status window 28 - 555