init

tools/mkpoints.py

@@ -0,0 +1,26 @@
+#!/usr/bin/python
+
+import sqlite3
+import sys, os
+import numpy as np
+
+output_file = 'points.db'
+
+if os.path.exists(output_file):
+  print "found old db, erasing"
+  os.unlink(output_file)
+
+create = 'CREATE TABLE points (point_id integer primary key, x float, y float)'
+
+sqconn = sqlite3.connect(output_file)
+sqc = sqconn.cursor()
+sqc.execute(create)
+
+for i in xrange(int(1e6)):
+  rx = np.random.rand() * 2 - 1
+  ry = np.random.rand() * 2 - 1
+  sqc.execute('INSERT INTO points VALUES (NULL, ?, ?)', (rx, ry))
+
+
+sqconn.commit()
+sqconn.close()

tools/multi/forktest.py

@@ -0,0 +1,22 @@
+#!/usr/bin/python
+
+import os
+import time
+
+def work():
+  j = 0.0
+  for i in xrange(10000000):
+    j = j + j/2.0
+
+
+
+pid = os.fork()
+if pid != 0:
+  print "i spawned %d and am working" % pid
+  work()
+else:
+  print "i am spawn, and am working"
+  work()
+  os._exit(0)
+
+print "parent done"

tools/multi/pool.py

@@ -0,0 +1,12 @@
+#!/usr/bin/python
+
+from multiprocessing import Pool
+
+def f(x):
+  return x*x
+
+if __name__ == '__main__':
+  pool = Pool(processes = 4)
+  result = pool.apply_async(f, (10,))
+  print result.get()
+  print pool.map(f, range(10))

tools/multi/smp.py

@@ -0,0 +1,24 @@
+#!/usr/bin/python
+
+from multiprocessing import Process, Lock
+
+def f(l, i, d):
+  d['a'] = 'shutup'
+  print 'hello world', i, d
+  j = 0.0
+  for i in xrange(1000000):
+    j = j + j/2.0
+
+if __name__ == '__main__':
+  lock = Lock()
+
+  d = {'a': 1, 'b': 2}
+
+  ps = []
+  for num in range(2):
+    ps.append(Process(target=f, args=(lock, num, d)))
+
+  for p in ps: p.start()
+  for p in ps: p.join()
+
+  print d

tools/multi/threadtest.py

@@ -0,0 +1,22 @@
+#!/usr/bin/python
+
+import thread, time
+
+def work():
+  j = 0.0
+  for i in xrange(10000000):
+    j = j + j/2.0
+
+def child(tid):
+  print "%d start" % tid
+  work()
+  print "%d  stop" % tid
+
+def parent():
+  i = 0
+  while True:
+    i += 1
+    thread.start_new(child, (i,))
+    if raw_input() == 'q': break
+
+parent()