A graphics processing unit kernel describes a unit of parallel work executed across many hardware threads. AI kernels implement operations such as matrix multiplication, attention, normalization, sampling, and data movement.
Kernel quality often determines whether theoretical hardware performance becomes usable. Efficient implementations manage memory layout, synchronization, numerical precision, parallelism, and the architecture-specific instruction set.
ELI5
A graphics processing unit kernel is a small program designed to run the same kind of operation across many pieces of data in parallel. AI software uses kernels for heavy mathematical work and moving data efficiently.
For example, one kernel can multiply large blocks of numbers across thousands of hardware threads. A well-designed kernel keeps those threads busy and avoids wasting time moving data back and forth through slow memory.
