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Adding (time [<name>] <expr>) macro for easy benchmarking.

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Alex Shinn 2015-03-22 22:44:38 +09:00
parent 9dcf11056c
commit 87761001aa
1 changed files with 27 additions and 5 deletions
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26
lib/chibi/time.sld
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@ -1,6 +1,6 @@
(define-library (chibi time)
(export current-seconds get-time-of-day
(export current-seconds get-time-of-day time
seconds->time seconds->string time->seconds time->string
make-timeval make-tm timeval-seconds timeval-microseconds
timezone-offset timezone-dst-time
@ -19,4 +19,26 @@
resource-usage/children get-resource-usage))
(else))
(import (chibi))
(include-shared "time"))
(include-shared "time")
(begin
(define (timeval->milliseconds tv)
(quotient (+ (* 1000000 (timeval-seconds tv))
(timeval-microseconds tv))
1000))
(define (time* name thunk)
(let* ((start (car (get-time-of-day)))
(result (thunk))
(end (car (get-time-of-day)))
(msecs (- (timeval->milliseconds end)
(timeval->milliseconds start))))
(display name (current-error-port))
(display ": " (current-error-port))
(display msecs (current-error-port))
(display " ms\n" (current-error-port))
result))
(define-syntax time
(syntax-rules ()
((time expr)
(time (call-with-output-string (lambda (out) (write expr out))) expr))
((time name expr)
(time* name (lambda () expr)))))))