55 lines
1.4 KiB
Python
55 lines
1.4 KiB
Python
|
"""
|
||
|
|
Try some models and see what they look like
|
||
|
|
Following this die could help https://en.wikichip.org/w/images/4/48/E5_v4_LCC.png
|
||
|
|
Using the following naming convention:
|
||
|
|
|
||
|
|
------
|
||
|
|
0 7
|
||
|
|
1 6
|
||
|
|
2 5
|
||
|
|
3 4
|
||
|
|
------
|
||
|
|
"""
|
||
|
|
import matplotlib.pyplot as plt
|
||
|
|
import numpy as np
|
||
|
|
|
||
|
|
nb_cores = 8
|
||
|
|
nb_slices = 8
|
||
|
|
|
||
|
|
cores = list(range(nb_cores))
|
||
|
|
slices = list(range(nb_slices))
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
def hit_jump_ring():
|
||
|
|
"""
|
||
|
|
- ini : initial cost
|
||
|
|
- core_step : cost to go from one core to the following (eg 0 to 1)
|
||
|
|
- ring_step : cost to go from one line to the other (eg 0 to 7)
|
||
|
|
|
||
|
|
Issue: on a same socket, we observe always the first 4 or last 4 patterns, but not mixed
|
||
|
|
"""
|
||
|
|
def hit(helper, slice, i, c, l):
|
||
|
|
if helper // (nb_cores/2) != slice // (nb_cores/2):
|
||
|
|
mini, maxi = min(slice, helper), max(slice, helper)
|
||
|
|
return i+l+c*(min(mini+nb_cores-1-maxi, maxi-mini-1))
|
||
|
|
else:
|
||
|
|
return i+c*abs(slice-helper)
|
||
|
|
|
||
|
|
ini, core_step, ring_step = 4, 1, 5
|
||
|
|
fig, axs = plt.subplots(nrows=1, ncols=8, figsize=(15, 5))
|
||
|
|
|
||
|
|
for i, helper in enumerate(range(8)):
|
||
|
|
axs[i].plot(cores, [hit(helper, slice, ini, core_step, ring_step) for slice in slices], "ro")
|
||
|
|
axs[i].set_title(f"helper = {helper}")
|
||
|
|
axs[i].set_ylabel("clflush_hit_time")
|
||
|
|
axs[i].set_xlabel("slice_group")
|
||
|
|
axs[i].set_ylim([0, 20])
|
||
|
|
|
||
|
|
plt.tight_layout()
|
||
|
|
plt.show()
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
hit_jump_ring()
|