Frame rate going down with threads?

General Discussion
1

Friends

I´m build a simple application in Panda3d who´s call to server with urllib2. Well i send a request to server with threads but my frame rate goig down a lot when a thread is run … so why? I use threads for preserve my frame rate. What happend?

import direct.directbase.DirectStart
from direct.gui import *
from direct.gui.DirectGui import *
from panda3d.core import *
from direct.stdpy.threading import *
from direct.interval.IntervalGlobal import *

import socket, urllib2
from urllib import urlencode
from time import time
from sys import exit

# urllib boost
realsocket=socket.socket
def socketwrap(family=socket.AF_INET, type=socket.SOCK_STREAM, proto=0):
	sockobj=realsocket(family, type, proto)
	sockobj.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
	return sockobj
socket.socket=socketwrap

# servers
url={"ugb":"xxx.server1", "palhaco":"xxx.server2"	}
dados={"nome":"Donovan Grey"}
texto=OnscreenText(text="Waiting...", mayChange=True, pos=(-0.5, 0.8), style=2, scale=0.05, align=TextNode.ACenter)


# Call server as Threads
ioLock=Lock()
class CallServer(Thread):
	def __init__(self, local):
		Thread.__init__(self)
		self.local=local
	def run(self):
		global url, dados, texto
		anterior=time()
		request=urllib2.Request(url[self.local], urlencode(dados))
		resposta=urllib2.urlopen(request)
		ioLock.acquire()
		texto["text"]=resposta.read()+":"+str(time()-anterior)
		ioLock.release()


palhacoThread=None
ugbThread=None

# see if thread already run. if true dont run interrupt
def callThread(nome="palhaco"):
	global palhacoThread, ugbThread
	thread=None
	if nome=="palhaco"	:	thread=palhacoThread
	elif nome=="ugb"	:	thread=ugbThread
	
	if thread==None or thread.join():
		thread=CallServer(nome)
		Parallel(Func(thread.start), Wait(1.5)).start()
	else:
		print "Thread already in run!"

palhacoButton=DirectButton(text=("Call Palhaco", "Call Palhaco", "Call Palhaco"), scale=0.1, pos=(0.8,0,0), command=callThread, extraArgs=["palhaco"])
ugbButton=DirectButton(text=("Call UGB", "Call UGB", "Call UGB"), scale=0.1, pos=(0.8,0,-0.2), command=callThread, extraArgs=["ugb"])

base.disableMouse()
base.accept("escape", exit)
run()
2

It’s normal for the frame rate to go down, a least a little, when you use threads. This is because your CPU is now sharing time between the original, main thread and your new thread.

You can mitigate this a little by using TPLow for your thread priority, but to do this, you have to use Panda’s threading interfaces directly (that is, use PythonThread instead of using direct.stdpy.threading).

David

3

Thread.setDaemon(True) helps a lot
Thanx