ESP32-S2-Saola-1 算圆周率
<div class='showpostmsg'><p>习惯上，我用算圆周率来比较MCU的性能。因为python支持大整数运算，圆周率计算正好用到大整数，可以初步体现出MCU的整数计算性能。</p><p> </p>
<p>下面程序是在以前microython的圆周率计算程序上稍作修改，将时间函数ticks_ms()改为monotonic()。程序需要先保存到文件，然后import 执行（circuitpython 不支持 execfile函数）。如果直接粘贴，大概率假死，这应该是系统的bug。</p>
<p> </p>
<pre>
<code class="language-python">from time import monotonic
def calc_pi(places=100):
extra = 8
one = 10 ** (places+extra)
t, c, n, na, d, da = 3*one, 3*one, 1, 0, 0, 24
while t > 1:
n, na, d, da = n+na, na+8, d+da, da+32
t = t * n // d
c += t
return c // (10 ** extra)
def pi_t(n = 500):
t1 = monotonic()
calc_pi(n)
t2 = monotonic()
return t2 - t1
print('calc pi 100 bits:', pi_t(100), 's')
print('calc pi 1000 bits:', pi_t(1000), 's')
print('calc pi 5000 bits:', pi_t(5000), 's')
</code></pre>
<p> </p>
<p>运行效果</p>
<p> </p>
<p></p>
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<p> </p>
<p>在ESP32-S2上，1000位比ESP32快，5000位慢，感觉没有发挥ESP32-S2性能，内存部分还可以提高优化效率。等circuitpython正式版出来再正式比较。</p>
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