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Memory Requirements
The table below lists the memory requirements of selected functions of
Bitplane and SVI software packages. UNIX systems are best operated in a
mode where all operations are performed using physical RAM. As soon as
swapping (i.e. writing parts of the memory to disk) starts to become heavy
the system may slow down drastically.
| Bitplane Software: Memory
Requirements |
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Symbol, Formula |
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Image Size in Pixels |
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small |
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large |
| Dimensions |
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| Width (x) |
X |
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256 |
512 |
512 |
512 |
1024 |
1024 |
2048 |
| Height (y) |
Y |
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256 |
512 |
512 |
512 |
1024 |
1024 |
2048 |
| Depth (z) |
Z |
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10 |
30 |
40 |
120 |
100 |
100 |
300 |
| Bytes/Pixel |
B |
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1 |
1 |
1 |
1 |
1 |
2 |
2 |
| No. of Channels |
C |
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1 |
1 |
2 |
2 |
1 |
3 |
3 |
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| Function |
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Memory
Requirement in Megabytes (MB) |
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| Size of Raw Data Set |
S |
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0.7 |
7.9 |
21.0 |
62.9 |
104.9 |
629.1 |
7'549.7 |
| Huygens
(all in RAM), can be reduced by dividing image |
24
* S / B |
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15.7 |
188.7 |
503.3 |
1'509.9 |
2'516.6 |
7'549.7 |
90'597.0 |
| Huygens
(minimum) |
6
* S / B |
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3.9 |
47.2 |
125.8 |
377.5 |
629.1 |
1'887.4 |
22'649.2 |
| Shadow
Projection |
S
+ x * y * 4 / B * C |
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0.9 |
8.9 |
23.1 |
65.0 |
109.1 |
635.4 |
7'574.9 |
| APV:
Shadow |
S
+x * y * z * (C+2) * 4 / B |
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8.5 |
102.2 |
188.7 |
566.2 |
1'363.1 |
1'677.7 |
20'132.7 |
| APV:
Ray |
S |
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0.7 |
7.9 |
21.0 |
62.9 |
104.9 |
629.1 |
7'549.7 |
| APV:
Perspective |
3
* S |
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2.0 |
23.6 |
62.9 |
188.7 |
314.6 |
1'887.4 |
22'649.2 |
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| MM, May 7, 1997 |
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| Example: The "Shadow Projection"
function of a 512 x 512 x 120 x 2 Channel image takes 65 MB or RAM |
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How much RAM does my system have?
To determine the amount of physical memory available on your system we
suggest to use the performance tools which can be found as follows:
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from the toolchest of your desktop click on "System" and select "System
Manager"
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click on "System Performance" and choose "View System Resources" or "View
Memory Usage" (IRIX 6.3 or later)
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use the UNIX command "hinv" to determine the amount of physical RAM of
your system (all operating systems)
Last Modification, May 98, MM
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