sin cpu

yidao620c · yidao620c · commit 8dae08f8fb18 · 2013-10-02T13:01:54.000+08:00
diff --git a/ch01_basic/at015_sincpu.py b/ch01_basic/at015_sincpu.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+# -*- encoding: utf-8 -*-
+# at015_sincpu: CPU正弦曲线
+"""
+    Topic: sample
+    Desc : CPU正弦曲线
+"""
+import itertools, math, time, sys
+
+__author__ = 'Xiong Neng'
+
+time_period = float(sys.argv[1]) if len(sys.argv) > 1 else 60   # seconds
+time_slice = float(sys.argv[2]) if len(sys.argv) > 2 else 0.04  # seconds
+
+N = int(time_period / time_slice)
+for i in itertools.cycle(range(N)):
+    busy_time = time_slice / 2 * (math.sin(2 * math.pi * i / N) + 1)
+    t = time.clock() + busy_time
+    while t > time.clock():
+        pass
+    time.sleep(time_slice - busy_time)
