# Environment Variables used by CIAO

- `CIAO_DEBUG_LEVEL`: An interger value accessible using `CIAO::debug_level()` call. Currently, CIAO follow the following usage conventions:
  - 20 < debug_level ≤ 20: Generate CIAO internal debug messages
  - 10 < debug_level ≤ 20: Generate CIAO tools debug messages
  - 0 < debug_level ≤ 10: Generate component-level debug messages

- `CIAO_DUMP_SAMPLE_HISTORY`: This environment variable was added for lack of component configuration support. Set it to 1 to turn on the dumping of performance samples to stdout in some performance test components.

Last modified: Sun Nov 30 20:29:14 Mountain Standard Time 2003