perf stat -e [event,...] COMMAND [ARGS]

(Example usage) perf stat -e cycles:u,instructions:u,cache-references:u,cache-misses:u ./matmul

(Some useful events)
 cycles:u - Total cycles (Be careful of what happens during CPU frequency scaling with respect to performance)
 instructions:u - Retired instructions
 cache-references:u - Usually, indicates LLC accesses, and it may include prefetch, coherence message depending on your CPU
 cache-misses:u - Usually, indicates LLC misses
 L1-dcache-load:u - L1 cache load accesses
 L1-dcache-load-misses:u - L1 cache load misses
 L1-dcache-stores:u - L1 cache store accesses
 L1-dcache-store-misses:u - L1 cache store misses