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: 36.0
Reference cycles: 36.04
UOPS_RETIRED.ALL: 23.0
RETIRE_SLOTS: 23.0
UOPS_MITE: 0.0
UOPS_MS: 23.0
UOPS_PORT_0: 6.0
UOPS_PORT_1: 7.0
UOPS_PORT_2: 0.0
UOPS_PORT_3: 0.0
UOPS_PORT_4: 0.0
UOPS_PORT_5: 10.0
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: 36.0
Reference cycles: 36.03
UOPS_RETIRED.ALL: 24.0
RETIRE_SLOTS: 24.0
UOPS_MITE: 1.0
UOPS_MS: 23.0
UOPS_PORT_0: 5.0
UOPS_PORT_1: 8.0
UOPS_PORT_2: 0.0
UOPS_PORT_3: 0.0
UOPS_PORT_4: 0.0
UOPS_PORT_5: 10.0
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: 36.1
Reference cycles: 36.1
UOPS_RETIRED.ALL: 23.1
RETIRE_SLOTS: 23.1
UOPS_MITE: 0.1
UOPS_MS: 23.0
UOPS_PORT_0: 5.9
UOPS_PORT_1: 7.1
UOPS_PORT_2: 0.0
UOPS_PORT_3: 0.0
UOPS_PORT_4: 0.0
UOPS_PORT_5: 10.1
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: 36.01
Reference cycles: 36.01
UOPS_RETIRED.ALL: 23.01
RETIRE_SLOTS: 23.01
UOPS_MITE: 0.01
UOPS_MS: 23.0
UOPS_PORT_0: 5.99
UOPS_PORT_1: 7.01
UOPS_PORT_2: 0.0
UOPS_PORT_3: 0.0
UOPS_PORT_4: 0.0
UOPS_PORT_5: 10.01
DIV_CYCLES: 0.0
ILD_STALL.LCP: 0.0
UOPS_MITE>=1: 0.01