But according to this test, printing one header by hand is 11331% more efficient than using CGI to do it. Did I miss something?

Two things:

• No useful program will ever print out 100,000 HTTP headers on purpose and exit. That'd be like me benchmarking various ways to roll a cigarette--completely useless because I don't smoke.
• chromatic's second rule of performance optimization: You're doing IO! Microbenchmarks don't matter!

Latency and throughput are much, much more important performance characteristics in such an application, and it's highly unlikely you'll optimize those to the degree that microoptimizations to save milliseconds in program startup time will have any benefit.

The only applicable scenario for this type of optimization is where you're running the program on your own machine and can't run it in a persistent process... but I can't imagine any use for that.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.