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Finally, one of the main purpose of the new CLASS file types was to
increase the data rate to the output file. Fig. shows
this rate for the old and new types. We can see (top-left) that, with
the old file type, this rate was decreasing when writing more and more
spectra, e.g. (with 16384 channels per spectrum) falling from 1300
spectra written per second (for the first thousands of spectra) to 300
when writing the
500,000ths. This is fixed with the new file
types: the data rate is constant over the number of spectra written
(top-right).
Again on the figure (bottom-right), with the new file types, we can
observe that the data rate is allways the same for a given number of
channels. For a low number of channels (), we can observe
that the USER time has an effect on this rate. But for higher number
of channels, the rate is dominated by the SYSTEM time: it decreases
linearly with the amount of data written. Typical values are: