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Linux Cubed Series 7: Sunsite
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scsh-0.4
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scsh-0.4.2
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profile.scm
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1995-10-13
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; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
; This was a fun hack, but I didn't get much useful information out of
; it -- a profiler that only samples at points allowed by the VM's
; interrupt mechanism doesn't tell you what you want to know. The
; only information available at that point is the continuation; what
; we really want to know is where the PC has been. In particular, the
; only procedures that show up in the table at all are those that call
; other procedures. JAR 12/92
'
(define-structure profiler (export profile one-second)
(open scheme-level-2 handle exception ;interrupts
architecture continuation signals condition template
table structure-refs debug-data sort
primitives) ;schedule-interrupt
(files (misc profile)))
(define (profile thunk frequency)
(let ((table (make-table template-uid))
(dt (round (/ one-second frequency))))
(primitive-catch
(lambda (k0)
(let ((foo (continuation-template k0)))
(with-handler
(lambda (c punt)
(if (and (interrupt? c)
(eq? (interrupt-type c) interrupt/alarm))
(primitive-catch
(lambda (k)
(record-profile-information! k foo table)
(schedule-interrupt dt)))
(punt)))
(lambda ()
(dynamic-wind (lambda () (schedule-interrupt dt))
thunk
(lambda () (schedule-interrupt 0))))))))
table))
(define (record-profile-information! k k0-template table)
(let ((k1 (continuation-cont (continuation-cont k))))
(let ((z (get-counts table k1)))
(set-car! z (+ (car z) 1))
(set-cdr! z (+ (cdr z) 1)))
(do ((k (continuation-parent k1) (continuation-parent k)))
((or (not (continuation? k))
(eq? (continuation-template k) k0-template)))
(let ((z (get-counts table k)))
(set-cdr! z (+ (cdr z) 1))))))
(define (get-counts table k)
(let ((info (template-info (continuation-template k))))
(or (table-ref table info)
(let ((z (cons 0 0)))
(table-set! table info z)
z))))
(define (template-uid info)
(cond ((integer? info)
info)
((debug-data? info)
(debug-data-uid info))
(else 0))) ;??
(define interrupt-type cadr)
(define interrupt/alarm (enum interrupt alarm))
(define (dump t)
(let ((l '()))
(table-walk (lambda (key count)
(let ((dd (if (integer? key)
(table-ref debug-data-table key)
key)))
(set! l (cons (cons count
(if (debug-data? dd)
(debug-data-names dd)
`(? ,key)))
l))))
t)
(do ((l (sort-list l more-interesting?)
(cdr l))
(i 0 (+ i 1)))
((or (null? l) (> i *prefix*)))
(let* ((counts+names (car l))
(leaf-count (caar counts+names))
(total-count (cdar counts+names))
(names (cdr counts+names)))
(display (pad-left total-count 6)) (display #\space)
(display (pad-left leaf-count 6)) (display #\space)
(write names)
(newline)))))
(define (more-interesting? x y)
(let ((c1 (cdar x))
(c2 (cdar y)))
(or (> c1 c2)
(and (= c1 c2)
(> (caar x) (caar y))))))
(define *prefix* 60)
(define (pad-left s n)
(let ((s (cond ((number? s) (number->string s))
((symbol? s) (symbol->string s))
(else s))))
(string-append (make-string (- n (string-length s)) #\space)
s)))