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Unix Version 7 - man page for profil (v7 section 2)

PROFIL(2)					 System Calls Manual					    PROFIL(2)

NAME
profil - execution time profile
SYNOPSIS
profil(buff, bufsiz, offset, scale) char *buff; int bufsiz, offset, scale;
DESCRIPTION
Buff points to an area of core whose length (in bytes) is given by bufsiz. After this call, the user's pro- gram counter (pc) is examined each clock tick (60th second); offset is subtracted from it, and the result mul- tiplied by scale. If the resulting number corresponds to a word inside buff, that word is incremented. The scale is interpreted as an unsigned, fixed-point fraction with binary point at the left: 0177777(8) gives a 1-1 mapping of pc's to words in buff; 077777(8) maps each pair of instruction words together. 02(8) maps all instructions onto the beginning of buff (producing a non-interrupting core clock). Profiling is turned off by giving a scale of 0 or 1. It is rendered ineffective by giving a bufsiz of 0. Profiling is turned off when an exec is executed, but remains on in child and parent both after a fork. Pro- filing may be turned off if an update in buff would cause a memory fault.
SEE ALSO
monitor(3), prof(1)
ASSEMBLER
(profil = 44.) sys profil; buff; bufsiz; offset; scale PROFIL(2)


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