Conference bulova::decw_jan-89_to_nov-90

3200.0. "GRAPHICS PROBLEMS - ANY HELP??" by WARNUT::YATES (Double Glazed DECWindows are best) Mon Aug 13 1990 08:06

Hello all,

I wonder if someone can help me here...I have a rather somcerning situation 
that I need to clarify as soon as possible.

My customer has a VAXStation 3100 and, also, under test, has a Sparc Station and 
a DECStation. The customer has already written C code on the VAXStation which 
uses X library calls to generate graphics, and is therefore (virtually) 
perfectly portable. The code has thus been moved to the DECStation and the Sparc
Station ... and it is here where the problems begin.

The Sparc Station (1) is able to run the code at the same speed as the
VAXStation - not very impressive for the customer. So, he decides to compile the
code on the DECStation, with expectations of something good. Unfortunately the 
DECStation runs the code even slower than the Sparc Station! 

I should like to understand the problems here ... does anyone have any input?
Are there certain tyopes of graphics code that the DECStation doesn't like, 
etc..???

The DECStation is a DECStation 3100.

Hope you can help.

Mark.

    Remember, the DECstation 3100 does not have a graphics accelerator.
    It is just a 8 plane frame buffer. The CPU does all the graphics
    work. On the VAXstation 3100 and the SPARCstation, the graphics
    accelerator offloads the cpu.