:bread crumbs: n. Debugging statements inserted into a program that
emit output or log indicators of the program's {state} to a file
so you can see where it dies, or pin down the cause of surprising
behavior. The term is probably a reference to the Hansel and Gretel
story from the Brothers Grimm; in several variants, a character
leaves a trail of breadcrumbs so as not to get lost in the
woods.
:break: 1. vt. To cause to be broken (in any sense). "Your latest patch to the editor broke the paragraph commands." 2. v. (of a program) To stop temporarily, so that it may debugged. The place where it stops is a `breakpoint'. 3. [techspeak] vi. To send an RS-232 break (two character widths of line high) over a serial comm line. 4. [UNIX] vi. To strike whatever key currently causes the tty driver to send SIGINT to the current process. Normally, break (sense 3) or delete does this. 5. `break break' may be said to interrupt a conversation (this is an example of verb doubling). This usage comes from radio communications, which in turn probably came from landline telegraph/teleprinter usage, as badly abused in the Citizen's Band craze a few years ago.
:break-even point: n. in the process of implementing a new computer language, the point at which the language is sufficiently effective that one can implement the language in itself. That is, for a new language called, hypothetically, FOOGOL, one has reached break-even when one can write a demonstration compiler for FOOGOL in FOOGOL, discard the original implementation language, and thereafter use older versions of FOOGOL to develop newer ones. This is an important milestone; see {MFTL}.
:breath-of-life packet: [XEROX PARC] n. An Ethernet packet that contained bootstrap (see {boot}) code, periodically sent out from a working computer to infuse the `breath of life' into any computer on the network that had happened to crash. Machines depending on such packets have sufficient hardware or firmware code to wait for (or request) such a packet during the reboot process. See also {dickless workstation}.
:breedle: n. See {feep}.
:bring X to its knees: v. To present a machine, operating system, piece of software, or algorithm with a load so extreme or {pathological} that it grinds to a halt. "To bring a MicroVAX to its knees, try twenty users running {vi} —- or four running {EMACS}." Compare {hog}.
:brittle: adj. Said of software that is functional but easily broken by changes in operating environment or configuration, or by any minor tweak to the software itself. Also, any system that responds inappropriately and disastrously to expected external stimuli; e.g., a file system that is usually totally scrambled by a power failure is said to be brittle. This term is often used to describe the results of a research effort that were never intended to be robust, but it can be applied to commercially developed software, which displays the quality far more often than it ought to. Oppose {robust}.
:broadcast storm: n. An incorrect packet broadcast on a network that causes most hosts to respond all at once, typically with wrong answers that start the process over again. See {network meltdown}.
:broken: adj. 1. Not working properly (of programs). 2. Behaving strangely; especially (when used of people) exhibiting extreme depression.
:broken arrow: [IBM] n. The error code displayed on line 25 of a 3270 terminal (or a PC emulating a 3270) for various kinds of protocol violations and "unexpected" error conditions (including connection to a {down} computer). On a PC, simulated with `->/_', with the two center characters overstruck. In true {luser} fashion, the original documentation of these codes (visible on every 3270 terminal, and necessary for debugging network problems) was confined to an IBM customer engineering manual.