In preparing the annual report on the Public Ada Library for
the Defense Information Systems Agency, I have run some programs
to come up with PAL usage statistics. These numbers, with an
explanation of how they were derived, are going into the report.
The report will be placed into the PAL when it is ready.
During March 1998, users from 500 organizations transferred
44,516 files from the main PAL site at Washington University Archive.
This site was down for about 10 days during March 1998 due to
a disk crash, so these figures reflect about 20 days of activity.
From April 97 to March 98 (the last year), users from 5,432
organizations transferred 515,923 files from the main PAL site.
There were several periods of down time, adding up to about one
month (a little less).
From September 93 to March 97 (from the time PAL statistics
gathering was started to before the last year), users from
6,378 organizations transferred 827,415 files from the 3 PAL
sites at Washington University Archive, Walnut Creek CDROM, and
CNAM. Statistics gathering changed in April 97 due to the
difficulty in gathering the information from all the PAL mirror
The total level of PAL activity from September 93 to March 98
recorded in the logs is:
users from 8,964 organizations in 108 countries transferred
1,343,338 files from the PAL system
The logs are available in the PAL itself. The Ada CDROM which
just came out contain the logs through Feb 98 (Mar 98 data is not
Activity of the mirror sites (automatic transfers by the mirrors)
has already been subtracted from these counts. FYI, counting the
mirror activity, 2,084,174 files were transferred from Sep 93 to
The PAL currently contains over 600 assets, ranging from
small reusable components to compilers to 14-week courses to
100+ page reports. I have not yet counted all the authors,
but there are hundreds of them. These authors are largely
members of the reuse community, the software engineering
community, and the Ada community (if you feel a need to classify
The Walnut Creek Ada CDROM that was just released contains about
50% (by volume) of the PAL and over 80% (by asset count). The
PAL is currently about 2.4G bytes in size (mostly compressed,
so this comes to over 20G total), and the Ada CDROM is about
1.3G bytes in size (also mostly compressed, so this comes to
about 10-12G total).
Details will be presented in the upcoming PAL annual report.
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Opinions expressed are my own and not necessarily those of anyone else.