Threading to ping 254 IP addresses in parallel batches
Threads - What why and how example from a Well House Consultants training course
More on Threads - What why and how [link]
Source code: fullrange Module: Y302
from threading import Thread
"""Threading demo to test out all 254 possible hosts on a
class C network via ping, in batches of 15 at a time
This code runs individual and parallel pings.
Since ping is implemented differently on different
versions of Linux and Unix, you may need to change
your ping options and the regular expression that it
matches to get the correct results """
def __init__ (self,ip):
self.ip = ip
self.status = -1
pingaling = os.popen("ping -q -c2 "+self.ip,"r")
line = pingaling.readline()
if not line: break
igot = re.findall(testit.lifeline,line)
self.status = int(igot)
testit.lifeline = re.compile(r"(\d) received")
report = ("No response","Partial Response","Alive")
MAX_PARALLEL = 15
pinglist = 
top = 254
# start off up to MAX_PARALLEL threads. Once the number
# of threads has reached MAX_PARALLEL, wait for one to complete
# before starting the next. On the very last host, await
# completion of all the threads.
# Because some threads are going to take much longer that
# others, this demonstration performs in spurts and there
# will often be a lot of completed pings for live systems
# awaiting reaping.
for host in range(1,top+1):
ip = "192.168.200."+str(host)
current = testit(ip)
waitfor = 0
if len(pinglist) > MAX_PARALLEL: waitfor = 1
if host == top: waitfor = len(pinglist)
for reap in range(waitfor):
pingle = pinglist
pinglist = pinglist[1:]
print "Status from ",pingle.ip,"is",report[pingle.status]
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