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| 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 |
2502.0. "VMS server arc performance" by DECWIN::NORCROSS () Thu Mar 22 1990 17:36
I'm trying to get some feedback on some work that I have been doing
in the VMS server related to arcs.
In many cases arcs do not conform to the X specification in the current
VMS V2.1 server - in other words the correct pixels are not
always lit. MIT did some work on arcs in release 4 which addresses
this problem and which speeds up the rendition in many cases as well.
I have fitted these changes into the VMS server along with some minor
performance improvements of my own.
Some of the results on monochrome VS 2000 and VAXstation II/GPX are
posted at the end of this memo. In most cases arc drawing performance has
increased, however there are some cases where performance has decreased.
The most serious performance degradation occurs on the GPX displaying :
* large circles and ellipses (500 pixel diameter) with zero-line-width
* ellipses with non-zero-line-width
* dashed ellipses with non-zero-line-width
What I want to know is: are these types of arcs used very often where
performance is very critical? Are people willing to take a decrease in
speed for these cases in order to get both "correctness" and a speed
increase for the smaller, more common cases.
The performance numbers are from X11perf. These tests were done on
standalone systems...Your mileage may vary. The first set of numbers are
from a monochrome VS2000; the second set from a VAXstation/GPX. The first
column of numbers contains the results in operations per second (ops/sec)
that occured running the new arc improvements. The second column contains
the results on the current DECwindows V2.1 (ops/sec). The third contains
the ratio of the new arc performance to the current server performance.
For example, 10-pixel circles are 6.6 times faster for the r4 arc
algorithms than the current V2.1 server.
Results ratios on SCANPROC are similar to the results on the GPX.
Please note that these numbers are not final and we are still looking
at ways to improve performance.
-AnnMarie
================================================================================
Monochrome VS2000
Test MIT r4 DECW V2.1 Ratio
arc code
(ops/sec) (ops/sec) r4 : V2.1
1-pixel circle 2410.0 NA NA
10-pixel circle 1430.0 217.0 6.6 : 1
100-pixel circle 325.0 112.0 2.9 : 1
500-pixel circle 73.7 52.1 1.4 : 1
100-pixel dashed circle 37.9 31.8 1.2 : 1
100-pixel dbl-dash circle 26.4 20.4 1.3 : 1
10-pixel wide circle 44.5 21.3 2.1 : 1
100-pixel wide circle 10.1 4.9 2.1 : 1
500-pixel wide circle 2.2 0.8 2.8 : 1
100-pixel wide dashed circle 3.2 4.0 1 : 1.25
100-pixel wide dbl-dash circle 2.7 2.3 1.2 : 1
10-pixel partial circle 727.0 239.0 3.1 : 1
100-pixel partial circle 192.0 151.0 1.3 : 1
1-pixel solid circle 50000.0 8210.0 6.1 : 1
10-pixel solid circle 650.0 189.0 3.4 : 1
100-pixel solid circle 79.2 58.8 1.3 : 1
500-pixel solid circle 14.8 27.8 1 : 1.9
10-pixel fill chord partial circle 338.0 177.0 1.9 : 1
100-pixel fill chord partial circle 78.4 83.8 1 : 1.1
10-pixel fill slice partial circle 316.0 140.0 2.3 : 1
100-pixel fill slice partial circle 71.2 67.5 1.1 : 1
10-pixel ellipse 1240.0 250.0 5.0 : 1
100-pixel ellipse 225.0 117.0 2.0 : 1
500-pixel ellipse 45.1 54.9 1 : 1.2
100-pixel dashed ellipse 46.3 37.8 1.2 : 1
100-pixel dbl-dashed ellipse 32.3 24.1 1.3 : 1
10-pixel wide ellipse 21.8 23.8 1 : 1.1
100-pixel wide ellipse 3.4 5.2 1 : 1.6
500-pixel wide ellipse 0.7 1.1 1 : 1.5
100-pixel wide dashed ellipse 1.4 4.7 1 : 3.4
100-pixel wide dbl-dashed ellipse 0.9 2.8 1 : 3.1
10-pixel partial ellipse 734.0 242.0 3.0 : 1
100-pixel partial ellipse 222.0 156.0 1.4 : 1
10-pixel filled ellipse 661.0 196.0 3.4 : 1
100-pixel filled ellipse 105.0 59.7 1.7 : 1
500-pixel filled ellipse 20.6 21.2 1 : 1
10-pixel fill chord partial ellipse 370.0 189.0 2.0 : 1
100-pixel fill chord ellipse 110.0 103.0 1.1 : 1
10-pixel fill slice partial ellipse 350.0 152.0 2.3 : 1
100-pixel fill slice ellipse 101.0 81.2 1.2 : 1
================================================================================
VAXstation II/GPX
Test MIT r4 DECW V2.1 Ratio
(ops/sec) (ops/sec) r4 : V2.1
1-pixel circle 1630.0 NA NA
10-pixel circle 1130.0 287.0 3.9 : 1
100-pixel circle 226.0 208.0 1.1 : 1
500-pixel circle 45.2 132.0 1 : 2.9
100-pixel dashed circle 71.8 171.0 1 : 2.4
100-pixel dbl-dash circle 57.8 171.0 1 : 3.0
10-pixel wide circle 48.3 21.6 2.2 : 1
100-pixel wide circle 12.3 5.3 2.3 : 1
500-pixel wide circle 2.8 1.0 2.8 : 1
100-pixel wide dashed circle 3.4 4.2 1 : 1.2
100-pixel wide dbl-dash circle 2.9 3.7 1 : 1.3
10-pixel partial circle 652.0 274.0 2.4 : 1
100-pixel partial circle 192.0 227.0 1 : 1.2
1-pixel solid circle 50900.0 7550.0 6.7 : 1
10-pixel solid circle 841.0 72.3 11.6 : 1
100-pixel solid circle 248.0 58.8 4.2 : 1
500-pixel solid circle 30.8 30.7 1 : 1
10-pixel fill chord partial circle 394.0 186.0 2.1 : 1
100-pixel fill chord partial circle 148.0 99.7 1.5 : 1
10-pixel fill slice partial circle 375.0 148.0 2.5 : 1
100-pixel fill slice partial circle 144.0 78.5 1.8 : 1
10-pixel ellipse 987.0 287.0 3.4 : 1
100-pixel ellipse 219.0 208.0 1.1 : 1
500-pixel ellipse 48.1 131.0 1 : 2.7
100-pixel dashed ellipse 87.4 172.0 1 : 2.0
100-pixel dbl-dashed ellipse 69.2 172.0 1 : 2.5
10-pixel wide ellipse 27.9 23.8 1.1 : 1
100-pixel wide ellipse 3.6 5.7 1 : 1.6
500-pixel wide ellipse 0.8 1.3 1 : 1.6
100-pixel wide dashed ellipse 1.4 5.0 1 : 3.57
100-pixel wide dbl-dashed ellipse 0.9 4.3 1 : 4.7
10-pixel partial ellipse 657.0 273.0 2.4 : 1
100-pixel partial ellipse 224.0 226.0 1 : 1
10-pixel filled ellipse 861.0 205.0 4.2 : 1
100-pixel filled ellipse 285.0 74.5 3.8 : 1
500-pixel filled ellipse 54.3 33.7 1.6 : 1
10-pixel fill chord partial ellipse 413.0 197.0 2.1 : 1
100-pixel fill chord ellipse 182.0 115.0 1.6 : 1
10-pixel fill slice partial ellipse 392.0 159.0 2.5 : 1
100-pixel fill slice ellipse 177.0 90.2 2.0 : 1
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