| Title: | DECWINDOWS 26-JAN-89 to 29-NOV-90 |
| Notice: | See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit |
| Moderator: | STAR::VATNE |
| Created: | Mon Oct 30 1989 |
| Last Modified: | Mon Dec 31 1990 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3726 |
| Total number of notes: | 19516 |
Hi,
I have an application that calls X$DRAW_LINES. The array to be plotted is
6000 points. If I try to plot all 6000 points in one call I get an error and
program crashes This always happens if I try to plot more than 4093 points.
If I modify the program to plot 4000 points in one DRAW_LINE call and the rest
(2000) in another call, it also works OK. Is there a limit to the size of the
array that can be plotted by DRAW_LINES? If so, where is it documented? 4093
is quite close to 4096 (largest number that can be represented by 12 bits).
I have a workaround (limit size of array passed to X$DRAW_LINES), but am not
sure if I found a bug or not. Anyone else seen this?
I can post the code and plot data if anyone is interested (FORTRAN code).
(VMS 5.1)...
==========================================================================
$R DECW/NODEB
file :
maxx = 431.0000
minx = -1150.000
buffer_len = 6001
maxx = 1.000000
minx = 1.6663890E-04
buffer_len = 6001
[_XInputArrival - input buffer pointer not empty during processing]
[ - state: 2 flags: 0 stopDepth: 0]
%SYSTEM-F-BADPARAM, bad parameter value
%TRACE-F-TRACEBACK, symbolic stack dump follows
module name routine name line rel PC abs PC
00073D3E 00073D3E
8015B8EF 8015B8EF
0006B9B5 0006B9B5
0006B7D5 0006B7D5
00081328 00081328
PLOT_THE_BUFFER PLOT_THE_BUFFER 6641 000000C4 00001D38
DECW$MAIN DECW$MAIN 37 000000B1 000010B1
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1167.1 | PRNSYS::LOMICKAJ | Jeff Lomicka | Tue Jul 25 1989 10:58 | 7 | |
I asked a similar question in DECWINDOWS_PROGRAMMING with XDrawSegments. When I had about 2040 segments - XLIB would I/O error. I never got any reply. | |||||
| 1167.2 | STAR::ORGOVAN | Vince Orgovan | Tue Jul 25 1989 20:09 | 6 | |
All of the XDrawFoobar routines are limited by the server's
maximum request size. If you ask in X conference on RDVAX
someone should be able to tell you how to figure out how
to translate the max request size into the maximum number
of Foobars that you can draw.
| |||||
| 1167.3 | Should be fixed in DECWindows V2 | STAR::BMATTHEWS | Wed Jul 26 1989 11:35 | 9 | |
Actually I believe that this problem is fixed in DECWindows V2. Vince or Jackie can correct me if I am wrong but my quick reading of the Xlib sources indicates that xlib will break out large requests if possible into sizes the server can take. If the semantics of the request are such that breaking a single xlib request into multiple x11 protocol requests is not possible then those requests are limited by the maximum request size allowed by the server. Bill | |||||
| 1167.4 | I'll try it again under DECWindows V2 | GIDDAY::CULLEN | Andrew Cullen, TSC New Zealand | Wed Jul 26 1989 23:51 | 5 |
Thanks for the replies. I shall install VMS 5.2 and DECwindows 2.0 FT1
this weekend to see if problem disappears.
Cheers,
Andrew
| |||||
| 1167.5 | POBOX::CHALTAS | Basketball is a peaceful planet! | Thu Jul 27 1989 10:34 | 8 | |
I found this problem LONG ago -- most systems have some kind of
limit -- UIS has a limit of 32K points, for instance.
I did notice that on a DS3100 that the limit was somewhere in exccess
of 16K (the limit of my test program).
George
| |||||