Demo: Why Care About Memory?

Four demos for the pitch, one per reason memory matters.

Demo	What it shows
memory-use/	Memory is what runs out: a browser process holding over a gigabyte.
buffer-cache/	Memory you do not see is working for you: the buffer cache, and what dropping it costs.
cache-memory/	Where data sits decides speed: the same loop nine times slower when it misses the cache.
memory-leak/	Memory you forget to free is gone: a 40-byte leak, found with valgrind.

Together they cover functionality and efficiency, performance, correctness, and the way a small mistake compounds. Security is left for lab 05, where the write past the end of a buffer becomes an exploit.