QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Minimizing RAM usage in QNX4 |
| Ref. No. |
QNX.000009632 |
| Category(ies) |
Installation, Filesystem, Configuration |
| Issue |
What steps can be taken to minimize RAM usage?
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| Solution |
From "use Fsys" notice that the options '-c', '-f', '-i', '-l', '-t', and '-C' will configure the memory usage of Fsys.
Run the system (or model thereof) with the default Fsys configuration, use it under normal/peak loads,and then use the results from "fsysinfo" to see what the maximum usage of inodes, files, locks, and threads were, and use these as a hint to configure lower values for the target. File locking ('-l') is usually a good candidate for shrinking.
Using '-c0' will still make a 32k cache by default, but even this is probably too small to be of much use, and if you can afford 64-128k it is usually a good assignment for memory. |
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