Optimizing code via compiler flags
The first edition of the Unix Programmer's Manual, dated November 3, 1971, is available here in image, Postscript, and PDF format. Return with us to the golden days of yesteryear!
The Computer Language Benchmarks Game is a collection of 429 programs, consisting of 13 benchmark reimplemented across 33 programming languages. It is a fantastic resource if you are trying to compare programming languages quantitatively. Which, oddly, very few people seems to be interested in doing.
mark mitchell, jeffrey oldham, and alex samuel.
UNIX System Calls and Subroutines using C.