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In Delphi, I am writing client software for open source message brokers, and would like the transfer rates with a realistic upper limit of what can be achieved on my local computer, or between my computer and a remote server in my network.

Is there a simple tool for Windows and/or Linux which continuously sends and receives many simple TCP/IP messages of a defined size, and shows current statistics like messages/second, MB/second?

I know that I could write it myself, but maybe the answer is also helpful for non-programmers :)

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I think iperf can do what you want. A win32 binary is available here.

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Test TCP (TTCP) is a command-line sockets-based benchmarking tool for measuring TCP and UDP performance between two systems.

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