i do not see what has changed in your code ? really strange,even with bad code the moment it crash should be the same, sometimes works,crash or freeze....
On Thu, Oct 13, 2022 at 2:41 PM Olivier Dion <olivier.d...@polymtl.ca> wrote: > On Thu, 13 Oct 2022, Damien Mattei <damien.mat...@gmail.com> wrote: > > the code did not worked when data length were more little than number of > > cpus (6 on my host) (iota 5) returns #unsepcified: > > Yeah sorry I miss indended the output and the rest. Here's a version > that should work: > --8<---------------cut here---------------start------------->8--- > (use-modules > (srfi srfi-1) > (ice-9 threads)) > > (define* (par-map-vector proc input > #:optional > (max-thread (current-processor-count))) > > (let* ((block-size (quotient (vector-length input) max-thread)) > (rest (remainder (vector-length input) max-thread)) > (output (make-vector (vector-length input) #f))) > (when (not (zero? block-size)) > (let ((mtx (make-mutex)) > (cnd (make-condition-variable)) > (n 0)) > (fold > (lambda (scale output) > (begin-thread > (let lp ((i 0)) > (when (< i block-size) > (let ((i (+ i (* scale block-size)))) > (vector-set! output i (proc (vector-ref input i)))) > (lp (1+ i)))) > (with-mutex mtx > (set! n (1+ n)) > (signal-condition-variable cnd))) > output) > output > (iota max-thread)) > (with-mutex mtx > (while (not (< n max-thread)) > (wait-condition-variable cnd mtx))))) > (let ((base (- (vector-length input) rest))) > (let lp ((i 0)) > (when (< i rest) > (let ((i (+ i base))) > (vector-set! output i (proc (vector-ref input i)))) > (lp (1+ i))))) > output)) > --8<---------------cut here---------------end--------------->8--- > > -- > Olivier Dion > oldiob.dev >
