python - Configuring client throughput in simple TCP server -


i given sample project goes this:

  1. client connects server b.
  2. a sends packet b, b returns same packet a.
  3. client sending throughput configurable
  4. measure turnaround time per packet.

now step 3 confusing me.

using python, way can think of "configuring throughput" set delay between characters in string.

  1. take string "test"
  2. start timer, send "t" server, , have server return it.
  3. once server returns it, stop timer , log it.

then call sleep() determined amount of time (this configurable part)

then same letters

e s  t

logging, time in-between.

however, seems silly, because not @ affecting relationship between client , server, setting delay between characters being sent.

or missing something? there way of "configuring" client a's throughput, , if so, mean?

thank you.

you can make client a's throughput configurable - on broader window of 1 second. first of sending single packets 1 characters going 'negatively affect' throughput, because payload way small compared headers attached.

the way can achieve decent measurable throughput sending mss packets (typically 1460 bytes in ethernet environments). can follows - send 'bursts' of 'n' packets per second. eg. if need throughput of 14600 

burstsize = 10 in range(burstsize):     sock.write(data)

every 1 second. how achieve - 1 second? it's bit tricky , hard accurate - this.

do time.time() before for, time.time() after for , after simple select remaining time. (that's way of introducing delay). broad skeleton

while true:     t1 = time.time()     in range(burstsize):         sock.write(1460)     t2 = time.time()     if t2 - t1 < 1.0:         tout = 1.0 - (t2-t1)         select.select([], [], [], tout) #

this simplistic - should give fair idea how go it.

measuring turnaround time every packet quite hard - , doesn't tell accurately latency in network tcp, because influenced tcp flow control. better use udp measure turnaround time, if interested in understanding underlying network characteristics bandwidth/latency.


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