polars.threadpool_size() int[source]#

Get the number of threads in the Polars thread pool.


The threadpool size can be overridden by setting the POLARS_MAX_THREADS environment variable before process start. (The thread pool is not behind a lock, so it cannot be modified once set). A reasonable use-case for this might be temporarily setting max threads to a low value before importing polars in a pyspark UDF or similar context. Otherwise, it is strongly recommended not to override this value as it will be set automatically by the engine.