Allow task tuning within the same process

[GregoryKimball]

When benchmarking with the KVIKIO_TASK_SIZE and KVIKIO_NTHREADS, I observed that changes to these variable don't seem to take effect if kvikIO has already been initialized in a process. For instance, if I loop over KVIKIO_NTHREADS in python, all of the reads seem to use the default values. However, if I set KVIKIO_TASK_SIZE and KVIKIO_NTHREADS before launching the python process, then they appear to work as intended.

Is it possible for KVIKIO_TASK_SIZE and KVIKIO_NTHREADS to be updated dynamically within a process?

[wence-]

You should use the programmatic interface rather than relying on environment variables:

import kvikio.defaults

kvikio.defaults.num_threads_reset(required_number_of_threads)

kvikio.defaults.task_size_reset(required_task_size)