Collision reduction through just-in-time resource allocation

A solid-state drive (SSD), comprising:

• a flash memory comprising a plurality of semiconductor memory dies arranged into die sets connected to channels with each die set coupled to a separate channel, each semiconductor memory die further comprising flash memory cells arranged into garbage collection units (GCUs) allocated and erased as a unit;
• a controller circuit configured to direct a transfer of data between the flash memory and an external client device coupled to the SSD via a host interface responsive to data transfer commands supplied by the external client device, the data transfer commands comprising read commands and write commands;
• and
• a command collision manager circuit coupled to the controller circuit comprising a command scheduler which sequentially directs the data transfer commands to the flash memory in a selected ratio of a first type of command to a second type of command responsive to a predetermined selection by the controller circuit to store data to and retrieve data from the flash memory in accordance with the selected ratio, the command collision manager circuit further operative to monitor an occurrence of collisions between competing commands, to adjust the selected ratio to implement a different, second selected ratio of the first type of command to the second type of command responsive to the occurrence of collisions exceeding a predetermined threshold, and to subsequently store data to and retrieve data from the flash memory in accordance with the different, second selected ratio.

A method comprising:

• storing data to a main memory comprising memory cells arranged on dies arranged as die sets accessible using parallel channels responsive to write commands;
• reading the data from the main memory responsive to read commands;
• executing the write commands and the read commands in accordance with a first selected ratio of the read commands to the write commands;
• monitoring for collision events among the read commands and the write commands;
• and
• adjusting the first selected ratio to provide a different, second selected ratio of the read commands to the write commands responsive to a total accumulated amount of the collision events exceeding a predetermined threshold;
• and
• subsequently storing data to the main memory and reading the data from the main memory in accordance with the second selected ratio.