NOP - Throughput and Uops
With unroll_count=500 and no inner loop
Code:
0: 90 nop
Show nanoBench command
Results:
Instructions retired: 1.0
Core cycles: 0.25
Reference cycles: 0.15
UOPS_EXECUTED.THREAD: 0.0
RETIRE_SLOTS: 1.0
UOPS_MITE: 1.0
UOPS_MS: 0.0
UOPS_PORT_0: 0.0
UOPS_PORT_1: 0.0
UOPS_PORT_5: 0.0
UOPS_PORT_6: 0.0
UOPS_PORT_23: 0.0
UOPS_PORT_49: 0.0
UOPS_PORT_78: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.25
With loop_count=1000 and unroll_count=10
Code:
0: 90 nop
Show nanoBench command
Results:
Instructions retired: 1.2
Core cycles: 0.24
Reference cycles: 0.14
UOPS_EXECUTED.THREAD: 0.1
RETIRE_SLOTS: 1.1
UOPS_MITE: 0.02
UOPS_MS: 0.0
UOPS_PORT_0: 0.0
UOPS_PORT_1: 0.0
UOPS_PORT_5: 0.0
UOPS_PORT_6: 0.1
UOPS_PORT_23: 0.0
UOPS_PORT_49: 0.0
UOPS_PORT_78: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.01
With loop_count=1000, unroll_count=10, and padding (redundant prefixes)
Code:
0: 40 rex 1: 40 rex 2: 40 rex 3: 40 rex 4: 40 rex 5: 40 rex 6: 40 90 rex nop
Show nanoBench command
Results:
Instructions retired: 1.2
Core cycles: 0.24
Reference cycles: 0.14
UOPS_EXECUTED.THREAD: 0.1
RETIRE_SLOTS: 1.1
UOPS_MITE: 0.0
UOPS_MS: 0.0
UOPS_PORT_0: 0.0
UOPS_PORT_1: 0.0
UOPS_PORT_5: 0.0
UOPS_PORT_6: 0.1
UOPS_PORT_23: 0.0
UOPS_PORT_49: 0.0
UOPS_PORT_78: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.0
With loop_count=100 and unroll_count=100
Code:
0: 90 nop
Show nanoBench command
Results:
Instructions retired: 1.02
Core cycles: 0.26
Reference cycles: 0.16
UOPS_EXECUTED.THREAD: 0.01
RETIRE_SLOTS: 1.01
UOPS_MITE: 1.01
UOPS_MS: 0.0
UOPS_PORT_0: 0.0
UOPS_PORT_1: 0.0
UOPS_PORT_5: 0.0
UOPS_PORT_6: 0.01
UOPS_PORT_23: 0.0
UOPS_PORT_49: 0.0
UOPS_PORT_78: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.26
With loop_count=100, unroll_count=100, and padding (redundant prefixes)
Code:
0: 40 rex 1: 40 rex 2: 40 rex 3: 40 rex 4: 40 rex 5: 40 rex 6: 40 90 rex nop
Show nanoBench command
Results:
Instructions retired: 1.02
Core cycles: 0.21
Reference cycles: 0.12
UOPS_EXECUTED.THREAD: 0.01
RETIRE_SLOTS: 1.01
UOPS_MITE: 0.01
UOPS_MS: 0.0
UOPS_PORT_0: 0.0
UOPS_PORT_1: 0.0
UOPS_PORT_5: 0.0
UOPS_PORT_6: 0.01
UOPS_PORT_23: 0.0
UOPS_PORT_49: 0.0
UOPS_PORT_78: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.0