[Discuss-gnuradio] sending periodic signals in tunnel.py

[Jane Chen]

Hi all,

 

Memory: 1008.6MiB

CPU: Processor 0: 2.8GHz and Processor 1:2.8GHz

OS: 2.6.27.23-78.2.50.fc.i686 (Fedora 9)

GNU Radio: neither 3.1.3 nor 3.2. (I download the gnuradio in the trunk several months ago.)

 

I have two machines, A and B ( the same systems as shown above).

I would like to send out signals periodically (every 4.5ms) from A to B in the MAC layer of the tunnel.py in the gnuradio-examples folder. I implemented this idea after the “while 1” in the “main_loop” for MAC. It took a while (a few hundreds millisecond) to repeat the loop. I think that Python might be too slow to be implemented the periodic signals so that the tunnel.py could not send the signal every 4.5ms. Right? Can anyone give me some hints to let me know if I can send out the signal every 4.5ms in tunnel.py? I would really appreciate any suggestions.

 

Thank you,

Jane

 

Codes in tunnel.py:

while 1:

        now=datetime.datetime.now()

        now_second=now.second

        now_usecond=now.microsecond

        now_time=(now_second)*1000000+now.microsecond

        print "While_1 now_time = %d"  % (now_time)

        # send out a packet to a client here

 

Results of Print:

While_1 now_time = 20754893 microsecond

While_1 now_time = 20755001

While_1 now_time = 20951609

While_1 now_time = 20952030

While_1 now_time = 20979402

While_1 now_time = 20979804

While_1 now_time = 21202578

While_1 now_time = 21453420

While_1 now_time = 21486651

While_1 now_time = 21653691

While_1 now_time = 22124831

While_1 now_time = 22284597

While_1 now_time = 22485948

While_1 now_time = 22682929

While_1 now_time = 22683291

While_1 now_time = 22800091