message: add note to README.md for CL_MEM_DUMP_THRESHOLD_MB
diff: @@ -144,6 +144,13 @@ To set the threshold at which a warn-level log message is generated for a long-r
  CL_EVENT_MAX_MICROSECS=1000
  ```
  +To set the threshold at which a queue dump will occur, use the env var `CL_MEM_DUMP_THRESHOLD_MB`. When the process reaches this level of memory allocation a dump will occur, but this will only occur once. Queue dumps can be found in `/tmp` once they are complete. For example, to set the threshold to 16000 megabytes:
  +
  +```
  +CL_MEM_DUMP_THRESHOLD_MB=16000
  +```
  +
  +
  ## Logging
  Logging can be enabled by setting the environment variable `RUST_LOG`. This can be set to one of the following levels,
  