I've got a couple of Unix questions...


#1: Consider the following:

   ~$ /usr/bin/time --format="%C\n%E wall time, %P CPU, %M KB maximum" 
./Prog1
   ./Prog1
   0:15.27 wall time, 89% CPU, 1608592 KB maximum

The program *actually* used about 400MB of RAM. So WTF is %M actually 
measuring? Because it sure as hell isn't "maximum resident set size of 
the process during its lifetime, measured in Kilobytes".

(Also, why do %D, %K and %X all return 0 for every program?)

More generally, how do I make time tell me HOW MUCH RAM WAS USED?



#2: You can compile a C++ program with

   g++ program.c++

However, for reasons beyond my comprehension, the result is always named 
"a.out". You can tediously fix this using the -o option. Alternatively, 
you can write a makefile:

   prog1: prog1.c++
     g++ prog1.c++ -o prog1

   prog2: prog2.c++
     g++ prog2.c++ -o prog2

   prog3: prog3.c++
     g++ prog3.c++ -o prog3

Is there any way of automating this absurd tedium?

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