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[PrivCPU] improved step function performance by checking time every tenth cycle

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This commit is contained in:
Anton Lydike 2021-06-08 16:33:48 +02:00
parent 60a2a8d546
commit 3d07c97a52
1 changed files with 16 additions and 10 deletions
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26
riscemu/priv/PrivCPU.py
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@ -160,10 +160,9 @@ class PrivCPU(CPU):
def step(self, verbose=True):
try:
if self.cycle % 1000 == 0:
self._perf_counters.append((time.perf_counter_ns(), self.cycle))
self.cycle += 1
self._timer_step()
if self.cycle % 10 == 0:
self._timer_step()
self._check_interrupt()
ins = self.mmu.read_ins(self.pc)
if verbose:
@ -207,6 +206,9 @@ class PrivCPU(CPU):
self.pc = mtvec
if mtvec & 0b11 == 1:
self.pc = (mtvec & 0b11111111111111111111111111111100) + (trap.code * 4)
self.record_perf_profile()
if len(self._perf_counters) % 100 == 0:
self.show_perf()
def show_perf(self):
timed = 0
@ -214,19 +216,23 @@ class PrivCPU(CPU):
cps_list = list()
print(FMT_CPU + "[CPU] Performance overview:")
for time_ns, cycle in self._perf_counters[-11:]:
for time_ns, cycle in self._perf_counters:
if cycled == 0:
cycled = cycle
timed = time_ns
continue
cps = (cycle - cycled) / (time_ns - timed) * 1000000000
print(" {:03d} cycles in {:08d}ns ({:.2f} cycles/s)".format(
cycle - cycled,
time_ns - timed,
cps
))
#print(" {:03d} cycles in {:08d}ns ({:.2f} cycles/s)".format(
# cycle - cycled,
# time_ns - timed,
# cps
#))
cycled = cycle
timed = time_ns
cps_list.append(cps)
print(" on average {:.0f} cycles/s".format(sum(cps_list) / len(cps_list)) + FMT_NONE)
print(" on average {:.0f} cycles/s".format(sum(cps_list) / len(cps_list)) + FMT_NONE)
self._perf_counters = list()
def record_perf_profile(self):
self._perf_counters.append((time.perf_counter_ns(), self.cycle))