Question

I have a question relates to PHP and Java programming.
I am going to develop a web application to do a unit testing.
PHP is the language that I’ll use for the web and will executes the exec() function.
as I read, the function returns the output of execution, ok I do need it.
but it’s not enough, I also think if I can get how much memory are used during the execution.
the web will run in an Apache web server in a Linux native operating system (orefered in Ubuntu).

This is the second case:
if there is a Java source which contains a program in which requires the user input during the execution, how can I execute it via a web server with also pass all the lines which may act as the user input?

the next problem is, the exec() function only accepts parameters in line.
How if I want

so, if there is any idea how to do that things?

Answer 1

The /usr/bin/time program (documented in time(1)) can return the amount of memory used during execution:

$ /usr/bin/time echo hello
hello
0.00user 0.00system 0:00.00elapsed ?%CPU (0avgtext+0avgdata 2512maxresident)k
0inputs+0outputs (0major+205minor)pagefaults 0swaps

You can see that the echo(1) program required 2.5 megabytes of memory and ran very quickly. Larger programs will be more impressive:

$ /usr/bin/time jacksum --help
Unknown argument. Use -h for help. Exit.
Command exited with non-zero status 2
0.08user 0.03system 0:00.87elapsed 12%CPU (0avgtext+0avgdata 57456maxresident)k
25608inputs+64outputs (92major+4072minor)pagefaults 0swaps

jacksum is a Java-based program, so it took 57 megabytes to tell me I screwed up the command line arguments. That’s more like it.

You might also find the BSD process account system worthwhile. See lastcomm(1), sa(8), and dump-acct(8) for more information.