How To Limit Memory Use

--memory-limit

The Rerun Viewer can not yet view more data than fits in RAM. The more data you log, the more RAM the Rerun Viewer will use. When it reaches a certain limit, the oldest data will be dropped. The default limit it to use up to 75% of the total system RAM.

You can set the limit by with the --memory-limit command-lint argument, or the memory_limit argument of rr.spawn.

--drop-at-latency

If you have multiple processes generating log data to Rerun it could happen that the Viewer builds up a backlog of unprocessed log messages. This can induce latency and also use up memory, which --memory-limit cannot fix. To handle this case, you can use rerun --drop-at-latency 500ms to start ignoring new data if the input buffer exceeds 500ms of data.

This is a rarely used feature, and is mostly documented here for completeness.