Experimental Physics and
Industrial Control System

Bakul Banerjee <[email protected]> · Wed, 17 Nov 1999 12:50:38 -0600

Dear Bob,

Can you please post the information (location of source and documentation)
for channel archiver?
Bakul.
Bob Dalesio wrote:

> The channel archiver was not meant as areplacement for SDDS. The
> toolset available in SDDS is more inline with Matlab, IDL, or
> other analysis tools. The channel archiver is meant to save data
> over time at the rate that the process can produce it - or at some
> rate that the facility wishes to keep it. I was under the impression
> that the SDDS data logging facility was somewhat rate limited to
> 1 Hz and that it was impracticle for saving Giga bytes of data over
> long periods of time. Is this so? In any case, it would be a worthwhile
> addition to the viewers available for the channel archiver to be able
> to produce SDDS format data in addition to the spreadsheet format that
> they already produce. There are currently three data viewers that are
> available in Beta release - xarr (unix/Motif), a windows NT plot similar
> to xarr, and a cgi server that runs through a browser. The latest version
> of the channel archiver, written by Kay Kasemir, runs under either UNIX
> or Windows and was tested on a Pentium 450 MHz PC collecting near 10K
> signals per second. At 10K, there is some loss due to channel access flow
> control being automatically turned on when the archiver is busy writing
> the data to disk.
>
> Could someone please clarify the data rates for SDDS logging?
>
>         Thanks,
>         Bob

--
Bakul Banerjee

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System