Member Avatar for MasterOfDevil

Hi,
I dont sure that I am posting the thread to right place.
I want to test user bandwith over an application that installed to user's computer.

There are online test tools , but I must I need java source code for implementing to our application.

Can anyone help about this?

Thanks;

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  • Latest Post Latest Post by Gasper11

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As is asking for a local bandwidth test and as and noted, a client/server transfer and counting bytes is the basic approach. To make results reliable: run a short warm-up, then a measured transfer long enough to get past TCP slow-start (5–15 seconds), measure on the receiving endpoint with System.nanoTime(), and compute throughput as bitsPerSecond = (totalBytes * 8) / elapsedSeconds (convert to Mbps by dividing by 1_000_000). Separate upload and download tests; do not assume a single short burst is representative.

Practical tuning and pitfalls: use a continuous random byte stream (avoid disk reads if disk might bottleneck), use large app buffers (32KB–64KB), tune socket buffers via setSendBufferSize/setReceiveBufferSize, and prefer java.nio.channels for high-throughput paths. Beware of OS or firewall shaping, CPU limits, and JVM GC pauses when interpreting low results. If testing many small messages, consider disabling Nagle only when appropriate; otherwise send larger writes to avoid packetization overhead. For saturated-link tests, running multiple parallel streams gives a more realistic maximum.

If a known baseline is needed, compare results with a dedicated tool such as iperf3. Java socket reference: java.net.Socket. iperf3 info and downloads: iperf3.

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Member Avatar for JamesCherrill

You could use a server application at one end, client at the other. Transfer a load of (random?) data from one to the other and see how long it takes. Java has full support for making connections across a network, start with a look at Sockets and ServerSockets in the Java API. You'll also find loads of stuff on the web about how to use Java Sockets for network communications.

Member Avatar for Gasper11

I think you should use Socket and InputStream objects. then, the whole point is to count bytes from InputStream, untill -1 appear.

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