1 ;;;; (statprof) -- a statistical profiler for Guile
4 ;;;; Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
5 ;;;; Copyright (C) 2004, 2009 Andy Wingo <wingo at pobox dot com>
6 ;;;; Copyright (C) 2001 Rob Browning <rlb at defaultvalue dot org>
8 ;;;; This library is free software; you can redistribute it and/or
9 ;;;; modify it under the terms of the GNU Lesser General Public
10 ;;;; License as published by the Free Software Foundation; either
11 ;;;; version 3 of the License, or (at your option) any later version.
13 ;;;; This library is distributed in the hope that it will be useful,
14 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 ;;;; Lesser General Public License for more details.
18 ;;;; You should have received a copy of the GNU Lesser General Public
19 ;;;; License along with this library; if not, write to the Free Software
20 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 ;;@code{(statprof)} is intended to be a fairly simple
27 ;;statistical profiler for guile. It is in the early stages yet, so
28 ;;consider its output still suspect, and please report any bugs to
29 ;;@email{guile-devel at gnu.org}, or to me directly at @email{rlb at
32 ;;A simple use of statprof would look like this:
35 ;; (statprof-reset 0 50000 #t)
42 ;;This would reset statprof, clearing all accumulated statistics, then
43 ;;start profiling, run some code, stop profiling, and finally display a
44 ;;gprof flat-style table of statistics which will look something like
48 ;; % cumulative self self total
49 ;; time seconds seconds calls ms/call ms/call name
50 ;; 35.29 0.23 0.23 2002 0.11 0.11 -
51 ;; 23.53 0.15 0.15 2001 0.08 0.08 positive?
52 ;; 23.53 0.15 0.15 2000 0.08 0.08 +
53 ;; 11.76 0.23 0.08 2000 0.04 0.11 do-nothing
54 ;; 5.88 0.64 0.04 2001 0.02 0.32 loop
55 ;; 0.00 0.15 0.00 1 0.00 150.59 do-something
59 ;;All of the numerical data with the exception of the calls column is
60 ;;statistically approximate. In the following column descriptions, and
61 ;;in all of statprof, "time" refers to execution time (both user and
62 ;;system), not wall clock time.
66 ;;The percent of the time spent inside the procedure itself
67 ;;(not counting children).
68 ;;@item cumulative seconds
69 ;;The total number of seconds spent in the procedure, including
72 ;;The total number of seconds spent in the procedure itself (not counting
75 ;;The total number of times the procedure was called.
77 ;;The average time taken by the procedure itself on each call, in ms.
79 ;;The average time taken by each call to the procedure, including time
80 ;;spent in child functions.
82 ;;The name of the procedure.
85 ;;The profiler uses @code{eq?} and the procedure object itself to
86 ;;identify the procedures, so it won't confuse different procedures with
87 ;;the same name. They will show up as two different rows in the output.
89 ;;Right now the profiler is quite simplistic. I cannot provide
90 ;;call-graphs or other higher level information. What you see in the
91 ;;table is pretty much all there is. Patches are welcome :-)
93 ;;@section Implementation notes
95 ;;The profiler works by setting the unix profiling signal
96 ;;@code{ITIMER_PROF} to go off after the interval you define in the call
97 ;;to @code{statprof-reset}. When the signal fires, a sampling routine is
98 ;;run which looks at the current procedure that's executing, and then
99 ;;crawls up the stack, and for each procedure encountered, increments
100 ;;that procedure's sample count. Note that if a procedure is encountered
101 ;;multiple times on a given stack, it is only counted once. After the
102 ;;sampling is complete, the profiler resets profiling timer to fire
103 ;;again after the appropriate interval.
105 ;;Meanwhile, the profiler keeps track, via @code{get-internal-run-time},
106 ;;how much CPU time (system and user -- which is also what
107 ;;@code{ITIMER_PROF} tracks), has elapsed while code has been executing
108 ;;within a statprof-start/stop block.
110 ;;The profiler also tries to avoid counting or timing its own code as
115 ;; When you add new features, please also add tests to ./tests/ if you
116 ;; have time, and then add the new files to ./run-tests. Also, if
117 ;; anyone's bored, there are a lot of existing API bits that don't
122 ;; Check about profiling C functions -- does profiling primitives work?
123 ;; Also look into stealing code from qprof so we can sample the C stack
126 (define-module (statprof)
127 #:use-module (srfi srfi-1)
128 #:autoload (ice-9 format) (format)
129 #:use-module (system vm vm)
130 #:use-module (system vm frame)
131 #:use-module (system vm program)
132 #:export (statprof-active?
137 statprof-accumulated-time
138 statprof-sample-count
139 statprof-fold-call-data
140 statprof-proc-call-data
141 statprof-call-data-name
142 statprof-call-data-calls
143 statprof-call-data-cum-samples
144 statprof-call-data-self-samples
145 statprof-call-data->stats
147 statprof-stats-proc-name
148 statprof-stats-%-time-in-proc
149 statprof-stats-cum-secs-in-proc
150 statprof-stats-self-secs-in-proc
152 statprof-stats-self-secs-per-call
153 statprof-stats-cum-secs-per-call
156 statprof-display-anomolies
158 statprof-fetch-stacks
159 statprof-fetch-call-tree
167 ;; This profiler tracks two numbers for every function called while
168 ;; it's active. It tracks the total number of calls, and the number
169 ;; of times the function was active when the sampler fired.
171 ;; Globally the profiler tracks the total time elapsed and the number
172 ;; of times the sampler was fired.
174 ;; Right now, this profiler is not per-thread and is not thread safe.
176 (define accumulated-time #f) ; total so far.
177 (define last-start-time #f) ; start-time when timer is active.
178 (define sample-count #f) ; total count of sampler calls.
179 (define sampling-frequency #f) ; in (seconds . microseconds)
180 (define remaining-prof-time #f) ; time remaining when prof suspended.
181 (define profile-level 0) ; for user start/stop nesting.
182 (define %count-calls? #t) ; whether to catch apply-frame.
183 (define gc-time-taken 0) ; gc time between statprof-start and
185 (define record-full-stacks? #f) ; if #t, stash away the stacks
186 ; for later analysis.
189 ;; procedure-data will be a hash where the key is the function object
190 ;; itself and the value is the data. The data will be a vector like
191 ;; this: #(name call-count cum-sample-count self-sample-count)
192 (define procedure-data #f)
194 ;; If you change the call-data data structure, you need to also change
195 ;; sample-uncount-frame.
196 (define (make-call-data proc call-count cum-sample-count self-sample-count)
197 (vector proc call-count cum-sample-count self-sample-count))
198 (define (call-data-proc cd) (vector-ref cd 0))
199 (define (call-data-name cd) (procedure-name (call-data-proc cd)))
200 (define (call-data-printable cd)
201 (or (call-data-name cd)
202 (with-output-to-string (lambda () (write (call-data-proc cd))))))
203 (define (call-data-call-count cd) (vector-ref cd 1))
204 (define (call-data-cum-sample-count cd) (vector-ref cd 2))
205 (define (call-data-self-sample-count cd) (vector-ref cd 3))
207 (define (inc-call-data-call-count! cd)
208 (vector-set! cd 1 (1+ (vector-ref cd 1))))
209 (define (inc-call-data-cum-sample-count! cd)
210 (vector-set! cd 2 (1+ (vector-ref cd 2))))
211 (define (inc-call-data-self-sample-count! cd)
212 (vector-set! cd 3 (1+ (vector-ref cd 3))))
214 (define-macro (accumulate-time stop-time)
215 `(set! accumulated-time
216 (+ accumulated-time 0.0 (- ,stop-time last-start-time))))
218 (define (get-call-data proc)
219 (let ((k (if (or (not (program? proc))
220 (zero? (program-num-free-variables proc)))
222 (program-objcode proc))))
223 (or (hashq-ref procedure-data k)
224 (let ((call-data (make-call-data proc 0 0 0)))
225 (hashq-set! procedure-data k call-data)
228 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
231 (define (sample-stack-procs stack)
232 (let ((stacklen (stack-length stack))
233 (hit-count-call? #f))
235 (if record-full-stacks?
236 (set! stacks (cons stack stacks)))
238 (set! sample-count (+ sample-count 1))
239 ;; Now accumulate stats for the whole stack.
240 (let loop ((frame (stack-ref stack 0))
241 (procs-seen (make-hash-table 13))
246 (lambda (proc val accum)
247 (inc-call-data-cum-sample-count!
248 (get-call-data proc)))
251 (and=> (and=> self get-call-data)
252 inc-call-data-self-sample-count!))
253 ((frame-procedure frame)
256 ((eq? proc count-call)
257 ;; We're not supposed to be sampling count-call and
258 ;; its sub-functions, so loop again with a clean
260 (set! hit-count-call? #t)
261 (loop (frame-previous frame) (make-hash-table 13) #f))
263 (hashq-set! procs-seen proc #t)
264 (loop (frame-previous frame)
268 (loop (frame-previous frame) procs-seen self))))
271 (define inside-profiler? #f)
273 (define (profile-signal-handler sig)
274 (set! inside-profiler? #t)
276 ;; FIXME: with-statprof should be able to set an outer frame for the
278 (if (positive? profile-level)
279 (let* ((stop-time (get-internal-run-time))
280 ;; cut down to the signal handler. note that this will only
281 ;; work if statprof.scm is compiled; otherwise we get
282 ;; `eval' on the stack instead, because if it's not
283 ;; compiled, profile-signal-handler is a thunk that
284 ;; tail-calls eval. perhaps we should always compile the
285 ;; signal handler instead...
286 (stack (or (make-stack #t profile-signal-handler)
287 (pk 'what! (make-stack #t))))
288 (inside-apply-trap? (sample-stack-procs stack)))
290 (if (not inside-apply-trap?)
292 ;; disabling here is just a little more efficient, but
293 ;; not necessary given inside-profiler?. We can't just
294 ;; disable unconditionally at the top of this function
295 ;; and eliminate inside-profiler? because it seems to
296 ;; confuse guile wrt re-enabling the trap when
297 ;; count-call finishes.
299 (set-vm-trace-level! (the-vm)
300 (1- (vm-trace-level (the-vm)))))
301 (accumulate-time stop-time)))
303 (setitimer ITIMER_PROF
305 (car sampling-frequency)
306 (cdr sampling-frequency))
308 (if (not inside-apply-trap?)
310 (set! last-start-time (get-internal-run-time))
312 (set-vm-trace-level! (the-vm)
313 (1+ (vm-trace-level (the-vm)))))))))
315 (set! inside-profiler? #f))
317 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
318 ;; Count total calls.
320 (define (count-call frame)
321 (if (not inside-profiler?)
323 (accumulate-time (get-internal-run-time))
325 (and=> (frame-procedure frame)
327 (inc-call-data-call-count!
328 (get-call-data proc))))
330 (set! last-start-time (get-internal-run-time)))))
332 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
334 (define (statprof-active?)
335 "Returns @code{#t} if @code{statprof-start} has been called more times
336 than @code{statprof-stop}, @code{#f} otherwise."
337 (positive? profile-level))
339 ;; Do not call this from statprof internal functions -- user only.
340 (define (statprof-start)
341 "Start the profiler.@code{}"
342 ;; After some head-scratching, I don't *think* I need to mask/unmask
343 ;; signals here, but if I'm wrong, please let me know.
344 (set! profile-level (+ profile-level 1))
345 (if (= profile-level 1)
346 (let* ((rpt remaining-prof-time)
348 (or (positive? (car rpt))
349 (positive? (cdr rpt))))))
350 (set! remaining-prof-time #f)
351 (set! last-start-time (get-internal-run-time))
353 (cdr (assq 'gc-time-taken (gc-stats))))
355 (setitimer ITIMER_PROF 0 0 (car rpt) (cdr rpt))
356 (setitimer ITIMER_PROF
358 (car sampling-frequency)
359 (cdr sampling-frequency)))
361 (add-hook! (vm-apply-hook (the-vm)) count-call))
362 (set-vm-trace-level! (the-vm) (1+ (vm-trace-level (the-vm))))
365 ;; Do not call this from statprof internal functions -- user only.
366 (define (statprof-stop)
367 "Stop the profiler.@code{}"
368 ;; After some head-scratching, I don't *think* I need to mask/unmask
369 ;; signals here, but if I'm wrong, please let me know.
370 (set! profile-level (- profile-level 1))
371 (if (zero? profile-level)
374 (- (cdr (assq 'gc-time-taken (gc-stats))) gc-time-taken))
375 (set-vm-trace-level! (the-vm) (1- (vm-trace-level (the-vm))))
377 (remove-hook! (vm-apply-hook (the-vm)) count-call))
378 ;; I believe that we need to do this before getting the time
379 ;; (unless we want to make things even more complicated).
380 (set! remaining-prof-time (setitimer ITIMER_PROF 0 0 0 0))
381 (accumulate-time (get-internal-run-time))
382 (set! last-start-time #f))))
384 (define* (statprof-reset sample-seconds sample-microseconds count-calls?
385 #:optional full-stacks?)
386 "Reset the statprof sampler interval to @var{sample-seconds} and
387 @var{sample-microseconds}. If @var{count-calls?} is true, arrange to
388 instrument procedure calls as well as collecting statistical profiling
389 data. If @var{full-stacks?} is true, collect all sampled stacks into a
390 list for later analysis.
392 Enables traps and debugging as necessary."
393 (if (positive? profile-level)
394 (error "Can't reset profiler while profiler is running."))
395 (set! %count-calls? count-calls?)
396 (set! accumulated-time 0)
397 (set! last-start-time #f)
398 (set! sample-count 0)
399 (set! sampling-frequency (cons sample-seconds sample-microseconds))
400 (set! remaining-prof-time #f)
401 (set! procedure-data (make-hash-table 131))
402 (set! record-full-stacks? full-stacks?)
404 (sigaction SIGPROF profile-signal-handler)
407 (define (statprof-fold-call-data proc init)
408 "Fold @var{proc} over the call-data accumulated by statprof. Cannot be
409 called while statprof is active. @var{proc} should take two arguments,
410 @code{(@var{call-data} @var{prior-result})}.
412 Note that a given proc-name may appear multiple times, but if it does,
413 it represents different functions with the same name."
414 (if (positive? profile-level)
415 (error "Can't call statprof-fold-called while profiler is running."))
418 (lambda (key value prior-result)
419 (proc value prior-result))
423 (define (statprof-proc-call-data proc)
424 "Returns the call-data associated with @var{proc}, or @code{#f} if
426 (if (positive? profile-level)
427 (error "Can't call statprof-fold-called while profiler is running."))
429 (hashq-ref procedure-data proc))
431 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
434 (define (statprof-call-data->stats call-data)
435 "Returns an object of type @code{statprof-stats}."
436 ;; returns (vector proc-name
438 ;; cum-seconds-in-proc
439 ;; self-seconds-in-proc
441 ;; self-secs-per-call
442 ;; total-secs-per-call)
444 (let* ((proc-name (call-data-printable call-data))
445 (self-samples (call-data-self-sample-count call-data))
446 (cum-samples (call-data-cum-sample-count call-data))
447 (all-samples (statprof-sample-count))
448 (secs-per-sample (/ (statprof-accumulated-time)
449 (statprof-sample-count)))
450 (num-calls (and %count-calls? (statprof-call-data-calls call-data))))
453 (* (/ self-samples all-samples) 100.0)
454 (* cum-samples secs-per-sample 1.0)
455 (* self-samples secs-per-sample 1.0)
457 (and num-calls ;; maybe we only sampled in children
458 (if (zero? self-samples) 0.0
459 (/ (* self-samples secs-per-sample) 1.0 num-calls)))
460 (and num-calls ;; cum-samples must be positive
461 (/ (* cum-samples secs-per-sample)
463 ;; num-calls might be 0 if we entered statprof during the
464 ;; dynamic extent of the call
465 (max num-calls 1))))))
467 (define (statprof-stats-proc-name stats) (vector-ref stats 0))
468 (define (statprof-stats-%-time-in-proc stats) (vector-ref stats 1))
469 (define (statprof-stats-cum-secs-in-proc stats) (vector-ref stats 2))
470 (define (statprof-stats-self-secs-in-proc stats) (vector-ref stats 3))
471 (define (statprof-stats-calls stats) (vector-ref stats 4))
472 (define (statprof-stats-self-secs-per-call stats) (vector-ref stats 5))
473 (define (statprof-stats-cum-secs-per-call stats) (vector-ref stats 6))
475 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
477 (define (stats-sorter x y)
478 (let ((diff (- (statprof-stats-self-secs-in-proc x)
479 (statprof-stats-self-secs-in-proc y))))
482 (- (statprof-stats-cum-secs-in-proc x)
483 (statprof-stats-cum-secs-in-proc y))
486 (define (statprof-display . port)
487 "Displays a gprof-like summary of the statistics collected. Unless an
488 optional @var{port} argument is passed, uses the current output port."
489 (if (null? port) (set! port (current-output-port)))
492 ((zero? (statprof-sample-count))
493 (format port "No samples recorded.\n"))
495 (let* ((stats-list (statprof-fold-call-data
496 (lambda (data prior-value)
497 (cons (statprof-call-data->stats data)
500 (sorted-stats (sort stats-list stats-sorter)))
502 (define (display-stats-line stats)
504 (format port "~6,2f ~9,2f ~9,2f ~7d ~8,2f ~8,2f "
505 (statprof-stats-%-time-in-proc stats)
506 (statprof-stats-cum-secs-in-proc stats)
507 (statprof-stats-self-secs-in-proc stats)
508 (statprof-stats-calls stats)
509 (* 1000 (statprof-stats-self-secs-per-call stats))
510 (* 1000 (statprof-stats-cum-secs-per-call stats)))
511 (format port "~6,2f ~9,2f ~9,2f "
512 (statprof-stats-%-time-in-proc stats)
513 (statprof-stats-cum-secs-in-proc stats)
514 (statprof-stats-self-secs-in-proc stats)))
515 (display (statprof-stats-proc-name stats) port)
520 (format port "~5a ~10a ~7a ~8a ~8a ~8a ~8@a\n"
521 "% " "cumulative" "self" "" "self" "total" "")
522 (format port "~5a ~9a ~8a ~8a ~8a ~8a ~8@a\n"
523 "time" "seconds" "seconds" "calls" "ms/call" "ms/call" "name"))
525 (format port "~5a ~10a ~7a ~8@a\n"
526 "%" "cumulative" "self" "")
527 (format port "~5a ~10a ~7a ~8@a\n"
528 "time" "seconds" "seconds" "name")))
530 (for-each display-stats-line sorted-stats)
532 (display "---\n" port)
533 (simple-format #t "Sample count: ~A\n" (statprof-sample-count))
534 (simple-format #t "Total time: ~A seconds (~A seconds in GC)\n"
535 (statprof-accumulated-time)
536 (/ gc-time-taken 1.0 internal-time-units-per-second))))))
538 (define (statprof-display-anomolies)
539 "A sanity check that attempts to detect anomolies in statprof's
541 (statprof-fold-call-data
542 (lambda (data prior-value)
543 (if (and %count-calls?
544 (zero? (call-data-call-count data))
545 (positive? (call-data-cum-sample-count data)))
548 (call-data-name data)
549 (call-data-call-count data)
550 (call-data-cum-sample-count data))))
552 (simple-format #t "Total time: ~A\n" (statprof-accumulated-time))
553 (simple-format #t "Sample count: ~A\n" (statprof-sample-count)))
555 (define (statprof-accumulated-time)
556 "Returns the time accumulated during the last statprof run.@code{}"
557 (if (positive? profile-level)
558 (error "Can't get accumulated time while profiler is running."))
559 (/ accumulated-time internal-time-units-per-second))
561 (define (statprof-sample-count)
562 "Returns the number of samples taken during the last statprof run.@code{}"
563 (if (positive? profile-level)
564 (error "Can't get accumulated time while profiler is running."))
567 (define statprof-call-data-name call-data-name)
568 (define statprof-call-data-calls call-data-call-count)
569 (define statprof-call-data-cum-samples call-data-cum-sample-count)
570 (define statprof-call-data-self-samples call-data-self-sample-count)
572 (define (statprof-fetch-stacks)
573 "Returns a list of stacks, as they were captured since the last call
574 to @code{statprof-reset}.
576 Note that stacks are only collected if the @var{full-stacks?} argument
577 to @code{statprof-reset} is true."
584 ((and (program? a) (program? b))
585 (eq? (program-objcode a) (program-objcode b)))
589 ;; tree ::= (car n . tree*)
591 (define (lists->trees lists equal?)
592 (let lp ((in lists) (n-terminal 0) (tails '()))
595 (let ((trees (map (lambda (tail)
597 (lists->trees (cdr tail) equal?)))
599 (cons (apply + n-terminal (map cadr trees))
601 (lambda (a b) (> (cadr a) (cadr b)))))))
603 (lp (cdr in) (1+ n-terminal) tails))
604 ((find (lambda (x) (equal? (car x) (caar in)))
611 (cons (cdar in) (cdr tail))))))
615 (acons (caar in) (list (cdar in)) tails))))))
617 (define (stack->procedures stack)
619 (unfold-right (lambda (x) (not x))
622 (stack-ref stack 0))))
624 (define (statprof-fetch-call-tree)
625 "Return a call tree for the previous statprof run.
627 The return value is a list of nodes, each of which is of the type:
629 node ::= (@var{proc} @var{count} . @var{nodes})
631 (cons #t (lists->trees (map stack->procedures stacks) procedure=?)))
633 (define* (statprof thunk #:key (loop 1) (hz 100) (count-calls? #f)
635 "Profiles the execution of @var{thunk}.
637 The stack will be sampled @var{hz} times per second, and the thunk itself will
638 be called @var{loop} times.
640 If @var{count-calls?} is true, all procedure calls will be recorded. This
641 operation is somewhat expensive.
643 If @var{full-stacks?} is true, at each sample, statprof will store away the
644 whole call tree, for later analysis. Use @code{statprof-fetch-stacks} or
645 @code{statprof-fetch-call-tree} to retrieve the last-stored stacks."
649 (statprof-reset (inexact->exact (floor (/ 1 hz)))
650 (inexact->exact (* 1e6 (- (/ 1 hz)
664 (set! procedure-data #f))))
666 (define-macro (with-statprof . args)
667 "Profiles the expressions in its body.
673 Execute the body @var{loop} number of times, or @code{#f} for no looping
681 Whether to instrument each function call (expensive)
685 Whether to collect away all sampled stacks into a list
689 (define (kw-arg-ref kw args def)
691 ((null? args) (error "Invalid macro body"))
692 ((keyword? (car args))
693 (if (eq? (car args) kw)
695 (kw-arg-ref kw (cddr args) def)))
696 ((eq? kw #f def) ;; asking for the body
698 (else def))) ;; kw not found
699 `((@ (statprof) statprof)
700 (lambda () ,@(kw-arg-ref #f args #f))
701 #:loop ,(kw-arg-ref #:loop args 1)
702 #:hz ,(kw-arg-ref #:hz args 100)
703 #:count-calls? ,(kw-arg-ref #:count-calls? args #f)
704 #:full-stacks? ,(kw-arg-ref #:full-stacks? args #f)))
706 (define* (gcprof thunk #:key (loop 1) (full-stacks? #f))
707 "Do an allocation profile of the execution of @var{thunk}.
709 The stack will be sampled soon after every garbage collection, yielding
710 an approximate idea of what is causing allocation in your program.
712 Since GC does not occur very frequently, you may need to use the
713 @var{loop} parameter, to cause @var{thunk} to be called @var{loop}
716 If @var{full-stacks?} is true, at each sample, statprof will store away the
717 whole call tree, for later analysis. Use @code{statprof-fetch-stacks} or
718 @code{statprof-fetch-call-tree} to retrieve the last-stored stacks."
721 (if (positive? profile-level)
722 (error "Can't reset profiler while profiler is running."))
723 (set! accumulated-time 0)
724 (set! last-start-time #f)
725 (set! sample-count 0)
726 (set! %count-calls? #f)
727 (set! procedure-data (make-hash-table 131))
728 (set! record-full-stacks? full-stacks?)
731 (define (gc-callback)
735 (set! inside-profiler? #t)
737 ;; FIXME: should be able to set an outer frame for the stack cut
738 (let ((stop-time (get-internal-run-time))
739 ;; Cut down to gc-callback, and then one before (the
740 ;; after-gc async). See the note in profile-signal-handler
742 (stack (or (make-stack #t gc-callback 0 1)
743 (pk 'what! (make-stack #t)))))
744 (sample-stack-procs stack)
745 (accumulate-time stop-time)
746 (set! last-start-time (get-internal-run-time)))
748 (set! inside-profiler? #f))))
751 (set! profile-level (+ profile-level 1))
752 (if (= profile-level 1)
754 (set! remaining-prof-time #f)
755 (set! last-start-time (get-internal-run-time))
756 (set! gc-time-taken (cdr (assq 'gc-time-taken (gc-stats))))
757 (add-hook! after-gc-hook gc-callback)
758 (set-vm-trace-level! (the-vm) (1+ (vm-trace-level (the-vm))))
762 (set! profile-level (- profile-level 1))
763 (if (zero? profile-level)
766 (- (cdr (assq 'gc-time-taken (gc-stats))) gc-time-taken))
767 (remove-hook! after-gc-hook gc-callback)
768 (accumulate-time (get-internal-run-time))
769 (set! last-start-time #f))))
784 (set! procedure-data #f))))