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SRT4C.BWR -- Beware file for SORT V4C
COPYRIGHT (C) 1981 BY
DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE
INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR ANY OTHER
COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY
THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.
SRT4C.BWR -- Beware file for SORT V4C Page 2
The following is a problem in Release 4.
SORT may be unable to sort VERY large files.
It will fail with ?DEVICE OR DATA ERROR.
This is caused by SORT trying to open 52 large temporary files. If
these files are larger than 512 pages then TOPS-20 requires that the
SUPERINDEX page of each large file be resident in the JSB. The
problem is that the JSB is not large enough to hold 52 SUPERINDEX
We believe that this is a monitor problem that should be fixed in a
future release. Until then there are three possible solutions:
1. This solution will only work with stand-alone or FORTRAN SORT, it
will not work with COBOL SORT. Use the new switch /MAX-TEMP-FILES to
limit the number of temporary work files to 15.
2. Rebuild the monitor with a bigger JSB. This might not be possible
in all cases. To do this:
In STG.MAC change the definition of NJSBPG from 50 decimal to say 75
decimal and rebuild. If you have enough space there will be no
problem, if not you will get an overlap error during loading.
3. The other solution is to change SORT to use less temporary files.
While this will always work it will result in worse performance even
for files that do not have this problem.
The fix is: in SRTPRM.MAC change the definition of MX.TMP from 26 to
[END OF SRT4C.BWR]