Do not adjust kernel-accel or scrypt-tmto for GPUs with unified memory, typically integrated GPUs in CPUs (APUs).
Redesign the "4-buffer" strategy to avoid overallocation from naive division by four, which can significantly increase memory usage for high scrypt configurations (e.g., 256k:8:1).
Update the scrypt B[] access pattern to match the new "4-buffer" design.
Allow user-specified kernel-accel and scrypt-tmto values, individually or both, via command line and tuning database. Any unspecified parameters are adjusted automatically.
Permit user-defined combinations of scrypt-tmto and kernel-accel even if they may exceed available memory.
Add support for lower iteration counts per kernel invocation than the default, enabling TMTO for low scrypt configurations, such as N=1024
Use TMTO 2 if it reaches 4 times the device processor count, instead of TMTO 1 always
Improve performance for low scrypt configurations (hash-mode 9300)
Fix unit test for 15700 with correct scrypt configurations
Disable CPU over subscription for SCRYPT based algorithms
