# PX4 logging frequency

Source: https://forum.modalai.com/topic/3369/px4-logging-frequency
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2024-04-29 11:54:30 UTC by boga
Replies: 2 · Views: 1436

## boga · 2024-04-29 11:54:30 UTC

I need to log PX4 sensors and GPS data as fast as possible. Right now the logging intervals are too slow. I found this forum post: https://discuss.px4.io/t/high-speed-logging/25242/4 .

According to this post I should change the rates in this file: 
https://github.com/PX4/PX4-Autopilot/blob/main/src/modules/logger/logged_topics.cpp

But this means that have to recompile the whole PX4 firmware (right?) and then upload it. Isn't there an easier way? Isn't there a way to change the logging intervals from a configuration file or through parameters or something like that?

## Reply by Eric Katzfey (ModalAI staff) · 2024-04-29 15:59:56 UTC

@boga Which log topics specifically are you wanting to increase the rates on? There is a PX4 parameter SDLOG_PROFILE that can enable some high rate logging topics.

## Reply by Eric Katzfey (ModalAI staff) · 2024-04-29 16:02:58 UTC

@boga If SDLOG_PROFILE doesn't have what you are looking for then you can set up a custom set of log topics / rates from a file. You don't need to recompile PX4 to use it. https://docs.px4.io/main/en/dev_log/logging.html#sd-card-configuration