v7.4.1 (Jan 9, 2023)

Version 7.4.1, Jan 9, 2023

* global free pool: disabled.  Benefit for single-thread user applications
    was modest, and it causes too much contention in a critical section
    when the user application is multi-threaded.
* GrB_mxm: revised task creation heuristics for sparse-times-sparse for
    better performance.  "chunk" and "very_costly" had been tuned in v7.3.x
    for sparse-times-dense but this slowed down sparse-times-sparse.  The
    new heuristic keeps the chunk & very_costly parameters for
    sparse-times-dense but restores the prior values for
    sparse-times-sparse from v7.2.0 (Aug 8, 2022).  See
    Source/GB_AxB_saxpy3_slice_balanced.c.