/usr/share/guile/2.0/statprof.scm is in guile-2.0-libs 2.0.5+1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 | ;;;; (statprof) -- a statistical profiler for Guile
;;;; -*-scheme-*-
;;;;
;;;; Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
;;;; Copyright (C) 2004, 2009 Andy Wingo <wingo at pobox dot com>
;;;; Copyright (C) 2001 Rob Browning <rlb at defaultvalue dot org>
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;
;;; Commentary:
;;
;;@code{(statprof)} is intended to be a fairly simple
;;statistical profiler for guile. It is in the early stages yet, so
;;consider its output still suspect, and please report any bugs to
;;@email{guile-devel at gnu.org}, or to me directly at @email{rlb at
;;defaultvalue.org}.
;;
;;A simple use of statprof would look like this:
;;
;;@example
;; (statprof-reset 0 50000 #t)
;; (statprof-start)
;; (do-something)
;; (statprof-stop)
;; (statprof-display)
;;@end example
;;
;;This would reset statprof, clearing all accumulated statistics, then
;;start profiling, run some code, stop profiling, and finally display a
;;gprof flat-style table of statistics which will look something like
;;this:
;;
;;@example
;; % cumulative self self total
;; time seconds seconds calls ms/call ms/call name
;; 35.29 0.23 0.23 2002 0.11 0.11 -
;; 23.53 0.15 0.15 2001 0.08 0.08 positive?
;; 23.53 0.15 0.15 2000 0.08 0.08 +
;; 11.76 0.23 0.08 2000 0.04 0.11 do-nothing
;; 5.88 0.64 0.04 2001 0.02 0.32 loop
;; 0.00 0.15 0.00 1 0.00 150.59 do-something
;; ...
;;@end example
;;
;;All of the numerical data with the exception of the calls column is
;;statistically approximate. In the following column descriptions, and
;;in all of statprof, "time" refers to execution time (both user and
;;system), not wall clock time.
;;
;;@table @asis
;;@item % time
;;The percent of the time spent inside the procedure itself
;;(not counting children).
;;@item cumulative seconds
;;The total number of seconds spent in the procedure, including
;;children.
;;@item self seconds
;;The total number of seconds spent in the procedure itself (not counting
;;children).
;;@item calls
;;The total number of times the procedure was called.
;;@item self ms/call
;;The average time taken by the procedure itself on each call, in ms.
;;@item total ms/call
;;The average time taken by each call to the procedure, including time
;;spent in child functions.
;;@item name
;;The name of the procedure.
;;@end table
;;
;;The profiler uses @code{eq?} and the procedure object itself to
;;identify the procedures, so it won't confuse different procedures with
;;the same name. They will show up as two different rows in the output.
;;
;;Right now the profiler is quite simplistic. I cannot provide
;;call-graphs or other higher level information. What you see in the
;;table is pretty much all there is. Patches are welcome :-)
;;
;;@section Implementation notes
;;
;;The profiler works by setting the unix profiling signal
;;@code{ITIMER_PROF} to go off after the interval you define in the call
;;to @code{statprof-reset}. When the signal fires, a sampling routine is
;;run which looks at the current procedure that's executing, and then
;;crawls up the stack, and for each procedure encountered, increments
;;that procedure's sample count. Note that if a procedure is encountered
;;multiple times on a given stack, it is only counted once. After the
;;sampling is complete, the profiler resets profiling timer to fire
;;again after the appropriate interval.
;;
;;Meanwhile, the profiler keeps track, via @code{get-internal-run-time},
;;how much CPU time (system and user -- which is also what
;;@code{ITIMER_PROF} tracks), has elapsed while code has been executing
;;within a statprof-start/stop block.
;;
;;The profiler also tries to avoid counting or timing its own code as
;;much as possible.
;;
;;; Code:
;; When you add new features, please also add tests to ./tests/ if you
;; have time, and then add the new files to ./run-tests. Also, if
;; anyone's bored, there are a lot of existing API bits that don't
;; have tests yet.
;; TODO
;;
;; Check about profiling C functions -- does profiling primitives work?
;; Also look into stealing code from qprof so we can sample the C stack
;; Call graphs?
(define-module (statprof)
#:use-module (srfi srfi-1)
#:autoload (ice-9 format) (format)
#:use-module (system vm vm)
#:use-module (system vm frame)
#:use-module (system vm program)
#:export (statprof-active?
statprof-start
statprof-stop
statprof-reset
statprof-accumulated-time
statprof-sample-count
statprof-fold-call-data
statprof-proc-call-data
statprof-call-data-name
statprof-call-data-calls
statprof-call-data-cum-samples
statprof-call-data-self-samples
statprof-call-data->stats
statprof-stats-proc-name
statprof-stats-%-time-in-proc
statprof-stats-cum-secs-in-proc
statprof-stats-self-secs-in-proc
statprof-stats-calls
statprof-stats-self-secs-per-call
statprof-stats-cum-secs-per-call
statprof-display
statprof-display-anomolies
statprof-fetch-stacks
statprof-fetch-call-tree
statprof
with-statprof
gcprof))
;; This profiler tracks two numbers for every function called while
;; it's active. It tracks the total number of calls, and the number
;; of times the function was active when the sampler fired.
;;
;; Globally the profiler tracks the total time elapsed and the number
;; of times the sampler was fired.
;;
;; Right now, this profiler is not per-thread and is not thread safe.
(define accumulated-time #f) ; total so far.
(define last-start-time #f) ; start-time when timer is active.
(define sample-count #f) ; total count of sampler calls.
(define sampling-frequency #f) ; in (seconds . microseconds)
(define remaining-prof-time #f) ; time remaining when prof suspended.
(define profile-level 0) ; for user start/stop nesting.
(define %count-calls? #t) ; whether to catch apply-frame.
(define gc-time-taken 0) ; gc time between statprof-start and
; statprof-stop.
(define record-full-stacks? #f) ; if #t, stash away the stacks
; for later analysis.
(define stacks '())
;; procedure-data will be a hash where the key is the function object
;; itself and the value is the data. The data will be a vector like
;; this: #(name call-count cum-sample-count self-sample-count)
(define procedure-data #f)
;; If you change the call-data data structure, you need to also change
;; sample-uncount-frame.
(define (make-call-data proc call-count cum-sample-count self-sample-count)
(vector proc call-count cum-sample-count self-sample-count))
(define (call-data-proc cd) (vector-ref cd 0))
(define (call-data-name cd) (procedure-name (call-data-proc cd)))
(define (call-data-printable cd)
(or (call-data-name cd)
(with-output-to-string (lambda () (write (call-data-proc cd))))))
(define (call-data-call-count cd) (vector-ref cd 1))
(define (call-data-cum-sample-count cd) (vector-ref cd 2))
(define (call-data-self-sample-count cd) (vector-ref cd 3))
(define (inc-call-data-call-count! cd)
(vector-set! cd 1 (1+ (vector-ref cd 1))))
(define (inc-call-data-cum-sample-count! cd)
(vector-set! cd 2 (1+ (vector-ref cd 2))))
(define (inc-call-data-self-sample-count! cd)
(vector-set! cd 3 (1+ (vector-ref cd 3))))
(define-macro (accumulate-time stop-time)
`(set! accumulated-time
(+ accumulated-time 0.0 (- ,stop-time last-start-time))))
(define (get-call-data proc)
(let ((k (if (or (not (program? proc))
(zero? (program-num-free-variables proc)))
proc
(program-objcode proc))))
(or (hashq-ref procedure-data k)
(let ((call-data (make-call-data proc 0 0 0)))
(hashq-set! procedure-data k call-data)
call-data))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; SIGPROF handler
(define (sample-stack-procs stack)
(let ((stacklen (stack-length stack))
(hit-count-call? #f))
(if record-full-stacks?
(set! stacks (cons stack stacks)))
(set! sample-count (+ sample-count 1))
;; Now accumulate stats for the whole stack.
(let loop ((frame (stack-ref stack 0))
(procs-seen (make-hash-table 13))
(self #f))
(cond
((not frame)
(hash-fold
(lambda (proc val accum)
(inc-call-data-cum-sample-count!
(get-call-data proc)))
#f
procs-seen)
(and=> (and=> self get-call-data)
inc-call-data-self-sample-count!))
((frame-procedure frame)
=> (lambda (proc)
(cond
((eq? proc count-call)
;; We're not supposed to be sampling count-call and
;; its sub-functions, so loop again with a clean
;; slate.
(set! hit-count-call? #t)
(loop (frame-previous frame) (make-hash-table 13) #f))
(else
(hashq-set! procs-seen proc #t)
(loop (frame-previous frame)
procs-seen
(or self proc))))))
(else
(loop (frame-previous frame) procs-seen self))))
hit-count-call?))
(define inside-profiler? #f)
(define (profile-signal-handler sig)
(set! inside-profiler? #t)
;; FIXME: with-statprof should be able to set an outer frame for the
;; stack cut
(if (positive? profile-level)
(let* ((stop-time (get-internal-run-time))
;; cut down to the signal handler. note that this will only
;; work if statprof.scm is compiled; otherwise we get
;; `eval' on the stack instead, because if it's not
;; compiled, profile-signal-handler is a thunk that
;; tail-calls eval. perhaps we should always compile the
;; signal handler instead...
(stack (or (make-stack #t profile-signal-handler)
(pk 'what! (make-stack #t))))
(inside-apply-trap? (sample-stack-procs stack)))
(if (not inside-apply-trap?)
(begin
;; disabling here is just a little more efficient, but
;; not necessary given inside-profiler?. We can't just
;; disable unconditionally at the top of this function
;; and eliminate inside-profiler? because it seems to
;; confuse guile wrt re-enabling the trap when
;; count-call finishes.
(if %count-calls?
(set-vm-trace-level! (the-vm)
(1- (vm-trace-level (the-vm)))))
(accumulate-time stop-time)))
(setitimer ITIMER_PROF
0 0
(car sampling-frequency)
(cdr sampling-frequency))
(if (not inside-apply-trap?)
(begin
(set! last-start-time (get-internal-run-time))
(if %count-calls?
(set-vm-trace-level! (the-vm)
(1+ (vm-trace-level (the-vm)))))))))
(set! inside-profiler? #f))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Count total calls.
(define (count-call frame)
(if (not inside-profiler?)
(begin
(accumulate-time (get-internal-run-time))
(and=> (frame-procedure frame)
(lambda (proc)
(inc-call-data-call-count!
(get-call-data proc))))
(set! last-start-time (get-internal-run-time)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (statprof-active?)
"Returns @code{#t} if @code{statprof-start} has been called more times
than @code{statprof-stop}, @code{#f} otherwise."
(positive? profile-level))
;; Do not call this from statprof internal functions -- user only.
(define (statprof-start)
"Start the profiler.@code{}"
;; After some head-scratching, I don't *think* I need to mask/unmask
;; signals here, but if I'm wrong, please let me know.
(set! profile-level (+ profile-level 1))
(if (= profile-level 1)
(let* ((rpt remaining-prof-time)
(use-rpt? (and rpt
(or (positive? (car rpt))
(positive? (cdr rpt))))))
(set! remaining-prof-time #f)
(set! last-start-time (get-internal-run-time))
(set! gc-time-taken
(cdr (assq 'gc-time-taken (gc-stats))))
(if use-rpt?
(setitimer ITIMER_PROF 0 0 (car rpt) (cdr rpt))
(setitimer ITIMER_PROF
0 0
(car sampling-frequency)
(cdr sampling-frequency)))
(if %count-calls?
(add-hook! (vm-apply-hook (the-vm)) count-call))
(set-vm-trace-level! (the-vm) (1+ (vm-trace-level (the-vm))))
#t)))
;; Do not call this from statprof internal functions -- user only.
(define (statprof-stop)
"Stop the profiler.@code{}"
;; After some head-scratching, I don't *think* I need to mask/unmask
;; signals here, but if I'm wrong, please let me know.
(set! profile-level (- profile-level 1))
(if (zero? profile-level)
(begin
(set! gc-time-taken
(- (cdr (assq 'gc-time-taken (gc-stats))) gc-time-taken))
(set-vm-trace-level! (the-vm) (1- (vm-trace-level (the-vm))))
(if %count-calls?
(remove-hook! (vm-apply-hook (the-vm)) count-call))
;; I believe that we need to do this before getting the time
;; (unless we want to make things even more complicated).
(set! remaining-prof-time (setitimer ITIMER_PROF 0 0 0 0))
(accumulate-time (get-internal-run-time))
(set! last-start-time #f))))
(define* (statprof-reset sample-seconds sample-microseconds count-calls?
#:optional full-stacks?)
"Reset the statprof sampler interval to @var{sample-seconds} and
@var{sample-microseconds}. If @var{count-calls?} is true, arrange to
instrument procedure calls as well as collecting statistical profiling
data. If @var{full-stacks?} is true, collect all sampled stacks into a
list for later analysis.
Enables traps and debugging as necessary."
(if (positive? profile-level)
(error "Can't reset profiler while profiler is running."))
(set! %count-calls? count-calls?)
(set! accumulated-time 0)
(set! last-start-time #f)
(set! sample-count 0)
(set! sampling-frequency (cons sample-seconds sample-microseconds))
(set! remaining-prof-time #f)
(set! procedure-data (make-hash-table 131))
(set! record-full-stacks? full-stacks?)
(set! stacks '())
(sigaction SIGPROF profile-signal-handler)
#t)
(define (statprof-fold-call-data proc init)
"Fold @var{proc} over the call-data accumulated by statprof. Cannot be
called while statprof is active. @var{proc} should take two arguments,
@code{(@var{call-data} @var{prior-result})}.
Note that a given proc-name may appear multiple times, but if it does,
it represents different functions with the same name."
(if (positive? profile-level)
(error "Can't call statprof-fold-called while profiler is running."))
(hash-fold
(lambda (key value prior-result)
(proc value prior-result))
init
procedure-data))
(define (statprof-proc-call-data proc)
"Returns the call-data associated with @var{proc}, or @code{#f} if
none is available."
(if (positive? profile-level)
(error "Can't call statprof-fold-called while profiler is running."))
(hashq-ref procedure-data proc))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Stats
(define (statprof-call-data->stats call-data)
"Returns an object of type @code{statprof-stats}."
;; returns (vector proc-name
;; %-time-in-proc
;; cum-seconds-in-proc
;; self-seconds-in-proc
;; num-calls
;; self-secs-per-call
;; total-secs-per-call)
(let* ((proc-name (call-data-printable call-data))
(self-samples (call-data-self-sample-count call-data))
(cum-samples (call-data-cum-sample-count call-data))
(all-samples (statprof-sample-count))
(secs-per-sample (/ (statprof-accumulated-time)
(statprof-sample-count)))
(num-calls (and %count-calls? (statprof-call-data-calls call-data))))
(vector proc-name
(* (/ self-samples all-samples) 100.0)
(* cum-samples secs-per-sample 1.0)
(* self-samples secs-per-sample 1.0)
num-calls
(and num-calls ;; maybe we only sampled in children
(if (zero? self-samples) 0.0
(/ (* self-samples secs-per-sample) 1.0 num-calls)))
(and num-calls ;; cum-samples must be positive
(/ (* cum-samples secs-per-sample)
1.0
;; num-calls might be 0 if we entered statprof during the
;; dynamic extent of the call
(max num-calls 1))))))
(define (statprof-stats-proc-name stats) (vector-ref stats 0))
(define (statprof-stats-%-time-in-proc stats) (vector-ref stats 1))
(define (statprof-stats-cum-secs-in-proc stats) (vector-ref stats 2))
(define (statprof-stats-self-secs-in-proc stats) (vector-ref stats 3))
(define (statprof-stats-calls stats) (vector-ref stats 4))
(define (statprof-stats-self-secs-per-call stats) (vector-ref stats 5))
(define (statprof-stats-cum-secs-per-call stats) (vector-ref stats 6))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (stats-sorter x y)
(let ((diff (- (statprof-stats-self-secs-in-proc x)
(statprof-stats-self-secs-in-proc y))))
(positive?
(if (= diff 0)
(- (statprof-stats-cum-secs-in-proc x)
(statprof-stats-cum-secs-in-proc y))
diff))))
(define (statprof-display . port)
"Displays a gprof-like summary of the statistics collected. Unless an
optional @var{port} argument is passed, uses the current output port."
(if (null? port) (set! port (current-output-port)))
(cond
((zero? (statprof-sample-count))
(format port "No samples recorded.\n"))
(else
(let* ((stats-list (statprof-fold-call-data
(lambda (data prior-value)
(cons (statprof-call-data->stats data)
prior-value))
'()))
(sorted-stats (sort stats-list stats-sorter)))
(define (display-stats-line stats)
(if %count-calls?
(format port "~6,2f ~9,2f ~9,2f ~7d ~8,2f ~8,2f "
(statprof-stats-%-time-in-proc stats)
(statprof-stats-cum-secs-in-proc stats)
(statprof-stats-self-secs-in-proc stats)
(statprof-stats-calls stats)
(* 1000 (statprof-stats-self-secs-per-call stats))
(* 1000 (statprof-stats-cum-secs-per-call stats)))
(format port "~6,2f ~9,2f ~9,2f "
(statprof-stats-%-time-in-proc stats)
(statprof-stats-cum-secs-in-proc stats)
(statprof-stats-self-secs-in-proc stats)))
(display (statprof-stats-proc-name stats) port)
(newline port))
(if %count-calls?
(begin
(format port "~5a ~10a ~7a ~8a ~8a ~8a ~8@a\n"
"% " "cumulative" "self" "" "self" "total" "")
(format port "~5a ~9a ~8a ~8a ~8a ~8a ~8@a\n"
"time" "seconds" "seconds" "calls" "ms/call" "ms/call" "name"))
(begin
(format port "~5a ~10a ~7a ~8@a\n"
"%" "cumulative" "self" "")
(format port "~5a ~10a ~7a ~8@a\n"
"time" "seconds" "seconds" "name")))
(for-each display-stats-line sorted-stats)
(display "---\n" port)
(simple-format #t "Sample count: ~A\n" (statprof-sample-count))
(simple-format #t "Total time: ~A seconds (~A seconds in GC)\n"
(statprof-accumulated-time)
(/ gc-time-taken 1.0 internal-time-units-per-second))))))
(define (statprof-display-anomolies)
"A sanity check that attempts to detect anomolies in statprof's
statistics.@code{}"
(statprof-fold-call-data
(lambda (data prior-value)
(if (and %count-calls?
(zero? (call-data-call-count data))
(positive? (call-data-cum-sample-count data)))
(simple-format #t
"==[~A ~A ~A]\n"
(call-data-name data)
(call-data-call-count data)
(call-data-cum-sample-count data))))
#f)
(simple-format #t "Total time: ~A\n" (statprof-accumulated-time))
(simple-format #t "Sample count: ~A\n" (statprof-sample-count)))
(define (statprof-accumulated-time)
"Returns the time accumulated during the last statprof run.@code{}"
(if (positive? profile-level)
(error "Can't get accumulated time while profiler is running."))
(/ accumulated-time internal-time-units-per-second))
(define (statprof-sample-count)
"Returns the number of samples taken during the last statprof run.@code{}"
(if (positive? profile-level)
(error "Can't get accumulated time while profiler is running."))
sample-count)
(define statprof-call-data-name call-data-name)
(define statprof-call-data-calls call-data-call-count)
(define statprof-call-data-cum-samples call-data-cum-sample-count)
(define statprof-call-data-self-samples call-data-self-sample-count)
(define (statprof-fetch-stacks)
"Returns a list of stacks, as they were captured since the last call
to @code{statprof-reset}.
Note that stacks are only collected if the @var{full-stacks?} argument
to @code{statprof-reset} is true."
stacks)
(define procedure=?
(lambda (a b)
(cond
((eq? a b))
((and (program? a) (program? b))
(eq? (program-objcode a) (program-objcode b)))
(else
#f))))
;; tree ::= (car n . tree*)
(define (lists->trees lists equal?)
(let lp ((in lists) (n-terminal 0) (tails '()))
(cond
((null? in)
(let ((trees (map (lambda (tail)
(cons (car tail)
(lists->trees (cdr tail) equal?)))
tails)))
(cons (apply + n-terminal (map cadr trees))
(sort trees
(lambda (a b) (> (cadr a) (cadr b)))))))
((null? (car in))
(lp (cdr in) (1+ n-terminal) tails))
((find (lambda (x) (equal? (car x) (caar in)))
tails)
=> (lambda (tail)
(lp (cdr in)
n-terminal
(assq-set! tails
(car tail)
(cons (cdar in) (cdr tail))))))
(else
(lp (cdr in)
n-terminal
(acons (caar in) (list (cdar in)) tails))))))
(define (stack->procedures stack)
(filter identity
(unfold-right (lambda (x) (not x))
frame-procedure
frame-previous
(stack-ref stack 0))))
(define (statprof-fetch-call-tree)
"Return a call tree for the previous statprof run.
The return value is a list of nodes, each of which is of the type:
@code
node ::= (@var{proc} @var{count} . @var{nodes})
@end code"
(cons #t (lists->trees (map stack->procedures stacks) procedure=?)))
(define* (statprof thunk #:key (loop 1) (hz 100) (count-calls? #f)
(full-stacks? #f))
"Profiles the execution of @var{thunk}.
The stack will be sampled @var{hz} times per second, and the thunk itself will
be called @var{loop} times.
If @var{count-calls?} is true, all procedure calls will be recorded. This
operation is somewhat expensive.
If @var{full-stacks?} is true, at each sample, statprof will store away the
whole call tree, for later analysis. Use @code{statprof-fetch-stacks} or
@code{statprof-fetch-call-tree} to retrieve the last-stored stacks."
(dynamic-wind
(lambda ()
(statprof-reset (inexact->exact (floor (/ 1 hz)))
(inexact->exact (* 1e6 (- (/ 1 hz)
(floor (/ 1 hz)))))
count-calls?
full-stacks?)
(statprof-start))
(lambda ()
(let lp ((i loop))
(if (not (zero? i))
(begin
(thunk)
(lp (1- i))))))
(lambda ()
(statprof-stop)
(statprof-display)
(set! procedure-data #f))))
(define-macro (with-statprof . args)
"Profiles the expressions in its body.
Keyword arguments:
@table @code
@item #:loop
Execute the body @var{loop} number of times, or @code{#f} for no looping
default: @code{#f}
@item #:hz
Sampling rate
default: @code{20}
@item #:count-calls?
Whether to instrument each function call (expensive)
default: @code{#f}
@item #:full-stacks?
Whether to collect away all sampled stacks into a list
default: @code{#f}
@end table"
(define (kw-arg-ref kw args def)
(cond
((null? args) (error "Invalid macro body"))
((keyword? (car args))
(if (eq? (car args) kw)
(cadr args)
(kw-arg-ref kw (cddr args) def)))
((eq? kw #f def) ;; asking for the body
args)
(else def))) ;; kw not found
`((@ (statprof) statprof)
(lambda () ,@(kw-arg-ref #f args #f))
#:loop ,(kw-arg-ref #:loop args 1)
#:hz ,(kw-arg-ref #:hz args 100)
#:count-calls? ,(kw-arg-ref #:count-calls? args #f)
#:full-stacks? ,(kw-arg-ref #:full-stacks? args #f)))
(define* (gcprof thunk #:key (loop 1) (full-stacks? #f))
"Do an allocation profile of the execution of @var{thunk}.
The stack will be sampled soon after every garbage collection, yielding
an approximate idea of what is causing allocation in your program.
Since GC does not occur very frequently, you may need to use the
@var{loop} parameter, to cause @var{thunk} to be called @var{loop}
times.
If @var{full-stacks?} is true, at each sample, statprof will store away the
whole call tree, for later analysis. Use @code{statprof-fetch-stacks} or
@code{statprof-fetch-call-tree} to retrieve the last-stored stacks."
(define (reset)
(if (positive? profile-level)
(error "Can't reset profiler while profiler is running."))
(set! accumulated-time 0)
(set! last-start-time #f)
(set! sample-count 0)
(set! %count-calls? #f)
(set! procedure-data (make-hash-table 131))
(set! record-full-stacks? full-stacks?)
(set! stacks '()))
(define (gc-callback)
(cond
(inside-profiler?)
(else
(set! inside-profiler? #t)
;; FIXME: should be able to set an outer frame for the stack cut
(let ((stop-time (get-internal-run-time))
;; Cut down to gc-callback, and then one before (the
;; after-gc async). See the note in profile-signal-handler
;; also.
(stack (or (make-stack #t gc-callback 0 1)
(pk 'what! (make-stack #t)))))
(sample-stack-procs stack)
(accumulate-time stop-time)
(set! last-start-time (get-internal-run-time)))
(set! inside-profiler? #f))))
(define (start)
(set! profile-level (+ profile-level 1))
(if (= profile-level 1)
(begin
(set! remaining-prof-time #f)
(set! last-start-time (get-internal-run-time))
(set! gc-time-taken (cdr (assq 'gc-time-taken (gc-stats))))
(add-hook! after-gc-hook gc-callback)
(set-vm-trace-level! (the-vm) (1+ (vm-trace-level (the-vm))))
#t)))
(define (stop)
(set! profile-level (- profile-level 1))
(if (zero? profile-level)
(begin
(set! gc-time-taken
(- (cdr (assq 'gc-time-taken (gc-stats))) gc-time-taken))
(remove-hook! after-gc-hook gc-callback)
(accumulate-time (get-internal-run-time))
(set! last-start-time #f))))
(dynamic-wind
(lambda ()
(reset)
(start))
(lambda ()
(let lp ((i loop))
(if (not (zero? i))
(begin
(thunk)
(lp (1- i))))))
(lambda ()
(stop)
(statprof-display)
(set! procedure-data #f))))
|