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profil - execution time profile
profil(buff, bufsiz, offset, scale)
int bufsiz, offset, scale;
Buff points to an area of core whose length (in bytes) is given by bufsiz. After this
call, the user's program counter (pc) is examined each clock tick (60th second); offset is
subtracted from it, and the result multiplied by scale. If the resulting number corre-
sponds 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 (pro-
ducing 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. Profiling may be turned off if an update in buff would
cause a memory fault.
(profil = 44.)
sys profil; buff; bufsiz; offset; scale
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