Network I/O

To measure the speed of data transfer through tcp/ip sockets between machines, say a Linux system acting as the receiver and a Windows system as a sender:

1. Open port 6001 (or pick another one) on the Linux machine you will use to run the receiver code.
2. Compile dimc_recv.c (with gcc).
3. Execute ./dimc_recv -- It will wait for a connection to be made from the other machine.
4. On a Windows machine, edit dimc_send.c and fill in the port number (6001) and the IP number of the Linux machine running the receiver code. Compile dimc_send.c with Windows Visual Studio (or modify the code to make it compile with gcc instead).
5. Run ./dimc_send, and see how long it takes (the time is printed at the end), or measure separately with the time command.
6. Calculate based on the link speed (e.g., 10 Mbps -- which is ten million bits, not bytes, per second) what the minimum transfer time is. If all is well, the test should come pretty close to this number.

Alternatively:

• Use the Tcl scripts dimc_server.tcl and dimc_client.tcl to perform a self-loop test on your machine (cheating, since the data never goes out onto the link, so this will likely report better performance).

Disk