From b4f4b6667913c1727f0312f8515861e3535bf1cd Mon Sep 17 00:00:00 2001
From: David Wilson <dw@botanicus.net>
Date: Wed, 4 Jul 2018 17:38:34 +0000
Subject: [PATCH] tests: make cpu_load.py more random.

---
 tests/soak/cpu_load.py | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/tests/soak/cpu_load.py b/tests/soak/cpu_load.py
index ed473b15..8890272c 100644
--- a/tests/soak/cpu_load.py
+++ b/tests/soak/cpu_load.py
@@ -4,12 +4,26 @@ Put the machine's CPUs under pressure to increase the likelihood of scheduling
 weirdness. Useful for exposing otherwise difficult to hit races in the library.
 """
 
+import ctypes
 import multiprocessing
+import os
+import time
+
+LIBC = ctypes.CDLL('libc.so.6')
+sched_yield = LIBC.sched_yield
+
 
 def burn():
-    while 1: pass
+    while 1:
+        a, b, c = os.urandom(3)
+        n = int(((ord(a) << 16) |
+                 (ord(b) << 8) |
+                 (ord(c) << 0)) / 1.6)
+        print(n)
+        for x in xrange(n): pass
+        sched_yield()
 
-mul = 2
+mul = 1.5
 count = int(mul * multiprocessing.cpu_count())
 print count