Added cpulimit daemon

sync_cpulimit.py

@@ -0,0 +1,25 @@
+import os
+import time
+import subprocess
+
+cpulimit_procs = {}
+worker_cpu_limit = int(os.environ.get("TAPIRIIK_WORKER_CPU_LIMIT", 4))
+
+while True:
+    active_pids = [pid for pid in os.listdir('/proc') if pid.isdigit()] # Sorry, operating systems without procfs
+    for pid in active_pids:
+        try:
+            proc_cmd = open("/proc/%s/cmdline" % pid, "r").read()
+        except IOError:
+            continue
+        else:
+            if "sync_worker.py" in proc_cmd:
+                if pid not in cpulimit_procs or cpulimit_procs[pid].poll():
+                    cpulimit_procs[pid] = subprocess.Popen(["cpulimit", "-l", str(worker_cpu_limit), "-p", pid])
+
+    for k in list(cpulimit_procs.keys()):
+        if cpulimit_procs[k].poll():
+            cpulimit_procs[k].wait()
+            del cpulimit_procs[k]
+
+    time.sleep(1)