Week 4 - 120 lab
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- a few more things about makefiles:

	to specify gcc as the compiler (not cc):
		CFLAGS= -ansi -std=c99 -pedantic -Wall -Wextra -O -g
		CC=gcc

- more on gdb

- practice with linked lists:

Here are the list files we were created in class this week.
	Makelist
	list.h
	list.c
	listDriver.c
You can download them onto your unix account easily with the command "wget":
>wget http://www.cs.jhu.edu/~joanne/cs120/code/Makelist
	Download all of those (use exact filename URLs), as well as the
	myRand.h and myRand.c files.

Write and test these other list functions:
	addTail
	sort (bubble sort is probably easiest)
	size

A mergesort function for a list would also be very interesting because it's
easier to merge (no extra memory) than with an array.  However, this probably
works best with a double linked list.  So maybe creating a doubly linked list
is a good exercise as well...




> memusage --help
Usage: memusage [OPTION]... PROGRAM [PROGRAMOPTION]...
Profile memory usage of PROGRAM.

   -n,--progname=NAME     Name of the program file to profile
   -p,--png=FILE          Generate PNG graphic and store it in FILE
   -d,--data=FILE         Generate binary data file and store it in FILE
   -u,--unbuffered        Don't buffer output
   -b,--buffer=SIZE       Collect SIZE entries before writing them out
      --no-timer          Don't collect additional information through timer
   -m,--mmap              Also trace mmap & friends

   -?,--help              Print this help and exit
      --usage             Give a short usage message
   -V,--version           Print version information and exit

 The following options only apply when generating graphical output:
   -t,--time-based        Make graph linear in time
   -T,--total             Also draw graph of total memory use
      --title=STRING      Use STRING as title of the graph
   -x,--x-size=SIZE       Make graphic SIZE pixels wide
   -y,--y-size=SIZE       Make graphic SIZE pixels high


Other ways of tracking memory on a Linux system:
	free, vmstat, "cat /proc/meminfo"
You can call these from within a C program, using the  "system" function