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We aim to track here where are the limitations depending on the
context (number of channels per spectrum, number of spectrum per
file).
Figure:
USER vs SYSTEM time for the NEW and SINGLE CLASS output
file types.
|
Fig.
shows that:
- with the NEW file type, there was always a point where the
USER time was equal to the SYSTEM time when writing more and
more spectra (e.g. they were equal for 30,000 spectra of 4096
channels).
- in the same context, USER time became a limiting factor a high
number of spectra, e.g. it was
order of magnitude
higher than the SYSTEM time when writing 524,288 spectra with
4,096 channels.
- the above point is not true anymore with the current version
of CLASS, and the USER time is allways lower than the
SYSTEM time (typically a half with 4,096 channels per
spectrum).
We can conclude that now (on the test machine), the SYSTEM time is the
limiting factor. The data rate is limited by both the hard disk driver
(software) and its writing speed (hardware). There is no easy way to
act on this time except from using a more performant hardware.
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Up: Times
Previous: SYSTEM time
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Gildas manager
2023-06-01