RDTSCP - Throughput and Uops
With unroll_count=500 and no inner loop
Code:
0: 0f 01 f9 rdtscp
Show nanoBench command
Results:
Instructions retired: 1.0
Core cycles: 30.0
Reference cycles: 26.67
UOPS_EXECUTED.CORE: 21.0
RETIRE_SLOTS: 21.0
UOPS_MITE: 0.0
UOPS_MS: 21.0
UOPS_PORT_0: 4.0
UOPS_PORT_1: 5.25
UOPS_PORT_2: 0.0
UOPS_PORT_3: 0.0
UOPS_PORT_4: 0.0
UOPS_PORT_5: 4.75
UOPS_PORT_6: 7.0
UOPS_PORT_7: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.0
With unroll_count=500, no inner loop, and 1 NOP
Code:
0: 0f 01 f9 rdtscp 3: 90 nop
Show nanoBench command
Results:
Instructions retired: 2.0
Core cycles: 30.0
Reference cycles: 26.67
UOPS_EXECUTED.CORE: 21.0
RETIRE_SLOTS: 22.0
UOPS_MITE: 1.0
UOPS_MS: 21.0
UOPS_PORT_0: 4.5
UOPS_PORT_1: 5.0
UOPS_PORT_2: 0.0
UOPS_PORT_3: 0.0
UOPS_PORT_4: 0.0
UOPS_PORT_5: 4.5
UOPS_PORT_6: 7.0
UOPS_PORT_7: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 1.0
With loop_count=1000 and unroll_count=10
Code:
0: 0f 01 f9 rdtscp
Show nanoBench command
Results:
Instructions retired: 1.2
Core cycles: 30.0
Reference cycles: 26.67
UOPS_EXECUTED.CORE: 21.1
RETIRE_SLOTS: 21.1
UOPS_MITE: 0.1
UOPS_MS: 21.0
UOPS_PORT_0: 4.0
UOPS_PORT_1: 5.25
UOPS_PORT_2: 0.0
UOPS_PORT_3: 0.0
UOPS_PORT_4: 0.0
UOPS_PORT_5: 4.75
UOPS_PORT_6: 7.1
UOPS_PORT_7: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.1
With loop_count=100 and unroll_count=100
Code:
0: 0f 01 f9 rdtscp
Show nanoBench command
Results:
Instructions retired: 1.02
Core cycles: 30.0
Reference cycles: 26.67
UOPS_EXECUTED.CORE: 21.01
RETIRE_SLOTS: 21.01
UOPS_MITE: 0.01
UOPS_MS: 21.0
UOPS_PORT_0: 4.0
UOPS_PORT_1: 5.25
UOPS_PORT_2: 0.0
UOPS_PORT_3: 0.0
UOPS_PORT_4: 0.0
UOPS_PORT_5: 4.75
UOPS_PORT_6: 7.01
UOPS_PORT_7: 0.0
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.01