You may want to use this controller instead of the default controller in very high post rate, throughput applications.

With this redis based input que post rate from a sequential free running post benchmark went from around 97 req/s up to 138 req/s on 4 core 2.0Ghz 8GB machine.

To use it just switch the controller's around. Rename que_input_controller.php to input_controller.php

You will also need to use the worker process which works through the queue. Which can be found in the scripts directory in the root emoncms folder. Change rpi in ./scripts/feedwriter:

RPI_BIN="/path/to/emoncms/scripts/input_queue_processor.php"
RPI_SCRIPT="input_queue_processor.php"