Any plan to support TBB 2021.1.1

[sunpoet]

task_scheduler_init is deprecated and being removed in TBB 2021.1.1. Is there any plan to support newer TBB?
Thanks.

[eddelbuettel]

Please see HISTORY.md. From the 2.1.0 release:

• Use of Intel's Thread Building Blocks (TBB) will be discontinued in the future. It is now disabled by default Disable TBB by default #1762
• No longer building release artifacts with Intel's Thread Building Blocks (TBB) enabled Remove building 'without_tbb' artifacts #1825

[Shelnutt2]

Hello @sunpoet , as @eddelbuettel has pointed out, we have disabled the use of TBB by default and will likely be removing support for it in the an upcoming release over the next couple months. As such we don't plan to upgrade the version at this time.

We've replaced the use of TBB with our own internal threadpool implementation that uses standard C++ threading. While TBB provided a nice workpool implementation and good concurrency primitives, we did have a number of issues with it. The two major issues that led us to work to remove it was:

1. The thread pool size could only be initialized once per process. This means in long-lived applications like MariaDB, or python shells a user couldn't adjust the TBB thread count over time or based on work load without restarting the process.
2. TBB did not like the main process being forked, this caused problems with python multi-process concurrency models and with packages like dask.

[sunpoet]

@eddelbuettel @Shelnutt2 Thanks for the quick and detailed answer. Currently the FreeBSD port databases/tiledb is built with TBB enabled unconditionally. I'll disable it later.