CODEWITHSUNDEEP
csocketsunixtimetcp
greensher
greensher

Reputation: 295

Measure tcp-connection speed

I want to write simple unix-application that measures tcp-connection speed. So I have:

I thought that measurement on server is somthing like this:

clock_gettime(CLOCK_REALTIME, &start);
size = recv(csocket_fd, buf, BUFFER_SIZE, 0);
clock_gettime(CLOCK_REALTIME, &end);

but it seems like it's wrong way.

any suggestions?

Upvotes: 1

Views: 1359

Answers (2)

Jeremy Friesner
Jeremy Friesner

Reputation: 73051

On the server, when you receive the first data from the client, record the current time to a variable.

Also on the server, whenever you receive data from the client, add the number of bytes received to a counter variable.

Then at any time you want, you can calculate the cumulative average bytes-per-second speed of the connection by calculating (total_bytes_received)/(current_time - first_data_received_time); (Watch out for a potential divide by zero if current_time and first_data_received_time are equal!)

If you want to do something more elaborate, like a running average over the last 10 seconds, that's a little more involved, but computing the cumulative average is pretty easy.

Upvotes: 2

DarthCoder
DarthCoder

Reputation: 354

I have done a few assignments in networking and one thing that i noticed it is that it wouldn't work the way you are trying to. We have to complete a send-receive for the server to receive again and there are other factors that prevent us from doing it ... from MTUs to buffer sizes etc. I have used is netperf to benchmark bandwidths before[is this the speed you are talking about ?]. The code is open source.

Upvotes: 0

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