13-post thread with @bmcnett. Canonical statement of the mmap log
design: 'printf-debugging is a horrible term; if you're debugger-
free might as well be libc-free.' .log file mapped, first half =
lines of fixed 64-char size (cacheline), second half = single 32-bit
atomic counter for write position. Writing = increment atomic +
dump line. No contention, no file IO, lock-free, captures temporal
ordering across threads. Fixed format:
r|sc.milmic|line_|hex_____|0000000000-|string...
(r=reload, sc.milmic=time since launch, line=source line, hex, dec,
msg). Tlk(__LINE__, n, 'msg') API, no printf needed. Examples show
startup timing (cart mapping 0.005-0.008s) + Vulkan instance 2.4s
with PSO hits at 3K us each. Multi-run log for comparison, Notepad2
F5 to reload. Discussion of fixed line widths in modern era. The
cleanest documentation of the mmap log pattern - 8 months before
the Aug 2025 CART file announcement.
