(declaim (inline get-internal-ticks))
(defun get-internal-ticks () (get-internal-run-time))
\f
-;;;; PCOUNTER
-
-;;; a PCOUNTER is used to represent an unsigned integer quantity which
-;;; can grow bigger than a fixnum, but typically does so, if at all,
-;;; in many small steps, where we don't want to cons on every step.
-;;; (Total system consing, time spent in a profiled function, and
-;;; bytes consed in a profiled function are all examples of such
-;;; quantities.)
-(defstruct (pcounter (:copier nil))
- (integer 0);; :type unsigned-byte)
- (fixnum 0));; :type (and fixnum unsigned-byte)))
-
-;;;(declaim (ftype (function (pcounter unsigned-byte) pcounter) incf-pcounter))
-;;;(declaim (inline incf-pcounter)) ; FIXME: maybe inline when more stable
-(defun incf-pcounter (pcounter delta)
- (aver (typep delta 'unsigned-byte))
- (let ((sum (+ (pcounter-fixnum pcounter) delta)))
- (aver (typep sum 'unsigned-byte))
- ;;(declare (type unsigned-byte sum))
- (cond ((typep sum 'fixnum)
- (setf (pcounter-fixnum pcounter) sum))
- (t
- (incf (pcounter-integer pcounter) sum)
- (setf (pcounter-fixnum pcounter) 0))))
- pcounter)
-
-(declaim (ftype (function (pcounter) integer) pcounter->integer))
-;;;(declaim (inline pcounter->integer)) ; FIXME: maybe inline when more stable
-(defun pcounter->integer (pcounter)
- (+ (pcounter-integer pcounter)
- (pcounter-fixnum pcounter)))
-\f
-;;;; operations on (OR PCOUNTER FIXNUM)
-;;;;
-;;;; When we don't want to cons a PCOUNTER unless we're forced to, we
-;;;; start with a FIXNUM counter and only create a PCOUNTER if the
-;;;; FIXNUM overflows.
-
-(declaim (ftype (function ((or pcounter fixnum) integer) (or pcounter fixnum)) %incf-pcounter-or-fixnum))
-;;;(declaim (inline %incf-pcounter-or-fixnum)) ; FIXME: maybe inline when more stable
-(defun %incf-pcounter-or-fixnum (x delta)
- (etypecase x
- (fixnum
- (let ((sum (+ x delta)))
- (if (typep sum 'fixnum)
- sum
- (make-pcounter :integer sum))))
- (pcounter
- (incf-pcounter x delta))))
-
-(define-modify-macro incf-pcounter-or-fixnum (delta) %incf-pcounter-or-fixnum)
-
-;;; Trade off space for execution time by handling the common fast
-;;; (TYPEP DELTA 'FIXNUM) case inline and only calling generic
-;;; arithmetic as a last resort.
-(defmacro fastbig-incf-pcounter-or-fixnum (x delta)
- (let ((delta-sym (gensym "DELTA")))
- `(let ((,delta-sym ,delta))
- (aver (typep ,delta-sym 'unsigned-byte))
- ;;(declare (type unsigned-byte ,delta-sym))
- (if (typep ,delta-sym 'fixnum)
- (incf-pcounter-or-fixnum ,x ,delta)
- (incf-pcounter-or-fixnum ,x ,delta)))))
-
-(declaim (ftype (function ((or pcounter fixnum)) integer) pcounter-or-fixnum->integer))
-(declaim (maybe-inline pcounter-or-fixnum->integer))
-(defun pcounter-or-fixnum->integer (x)
- (etypecase x
- (fixnum x)
- (pcounter (pcounter->integer x))))
-\f
;;;; implementation-dependent interfaces
#|
(defvar *enclosed-profiles* 0)
(declaim (type (or pcounter fixnum) *enclosed-profiles*))
+;;; the encapsulated function we're currently computing profiling data
+;;; for, recorded so that we can detect the problem of
+;;; PROFILE-computing machinery calling a function which has itself
+;;; been PROFILEd
+(defvar *computing-profiling-data-for*)
+
;;; the components of profiling overhead
(defstruct (overhead (:copier nil))
;; the number of ticks a bare function call takes. This is
(total (required-argument) :type single-float :read-only t))
(defvar *overhead*)
(declaim (type overhead *overhead*))
+(makunbound '*overhead*) ; in case we reload this file when tweaking
\f
;;;; profile encapsulations
;;; inline.
(defmacro fastbig- (x y)
(once-only ((x x) (y y))
- `(if (and (typep ,x 'fixnum)
- (typep ,y 'fixnum))
+ `(if (and (typep ,x '(and fixnum unsigned-byte))
+ (typep ,y '(and fixnum unsigned-byte)))
+ ;; special case: can use fixnum arithmetic and be guaranteed
+ ;; the result is also a fixnum
(- ,x ,y)
+ ;; general case
(- ,x ,y))))
(defmacro fastbig-1+ (x)
(once-only ((x x))
;; ENCAPSULATION-FUN
(lambda (sb-c:&more arg-context arg-count)
(declare (optimize speed safety))
+ ;; Make sure that we're not recursing infinitely.
+ (when (boundp '*computing-profiling-data-for*)
+ (unprofile-all) ; to avoid further recursion
+ (error "~@<When computing profiling data for ~S, the profiled function ~S was called. To get out of this infinite recursion, all functions have been unprofiled. (Since the profiling system evidently uses ~S in its computations, it looks as though it's a bad idea to profile it.)~:@>"
+ *computing-profiling-data-for*
+ encapsulated-fun
+ encapsulated-fun))
;; FIXME: Probably when this is stable, we should optimize (SAFETY 0).
(fastbig-incf-pcounter-or-fixnum count 1)
(let ((dticks 0)
(dconsing 0)
(inner-enclosed-profiles 0))
- ;;(declare (type unsigned-byte dticks dconsing))
- ;;(declare (type unsigned-byte inner-enclosed-profiles))
+ (declare (type unsigned-byte dticks dconsing))
+ (declare (type unsigned-byte inner-enclosed-profiles))
(aver (typep dticks 'unsigned-byte))
(aver (typep dconsing 'unsigned-byte))
(aver (typep inner-enclosed-profiles 'unsigned-byte))
(multiple-value-prog1
- (let ((start-ticks (get-internal-ticks))
- ;; KLUDGE: We add (THE UNSIGNED-BYTE ..) wrappers
- ;; around GET-BYTES-CONSED because as of
- ;; sbcl-0.6.4, at the time that the FTYPE of
- ;; GET-BYTES-CONSED is DECLAIMed, the
- ;; cross-compiler's type system isn't mature enough
- ;; to do anything about it. -- WHN 20000503
- (start-consing (the unsigned-byte (get-bytes-consed)))
- (*enclosed-ticks* 0)
- (*enclosed-consing* 0)
- (*enclosed-profiles* 0))
+ (let* ((start-ticks (get-internal-ticks))
+ (*enclosed-ticks* 0)
+ (*enclosed-consing* 0)
+ (*enclosed-profiles* 0)
+ (nbf-pcounter *n-bytes-freed-or-purified-pcounter*)
+ ;; Typically NBF-PCOUNTER will represent a bignum.
+ ;; In general we don't want to cons up a new
+ ;; bignum for every encapsulated call, so instead
+ ;; we keep track of the PCOUNTER internals, so
+ ;; that as long as we only cons small amounts,
+ ;; we'll almost always just do fixnum arithmetic.
+ ;; (And for encapsulated functions which cons
+ ;; large amounts, then a single extra consed
+ ;; bignum tends to be proportionally negligible.)
+ (nbf0-integer (pcounter-integer nbf-pcounter))
+ (nbf0-fixnum (pcounter-fixnum nbf-pcounter))
+ (dynamic-usage-0 (sb-kernel:dynamic-usage)))
(declare (inline pcounter-or-fixnum->integer))
(multiple-value-prog1
(multiple-value-call encapsulated-fun
(sb-c:%more-arg-values arg-context
0
arg-count))
- (setf dticks (fastbig- (get-internal-ticks) start-ticks)
- dconsing (fastbig- (the unsigned-byte
- (get-bytes-consed))
- start-consing))
- (setf inner-enclosed-profiles
- (pcounter-or-fixnum->integer *enclosed-profiles*))
- (when (minusp dticks) ; REMOVEME
- (error "huh? (GET-INTERNAL-TICKS)=~S START-TICKS=~S"
- (get-internal-ticks) start-ticks))
- (aver (not (minusp dconsing))) ; REMOVEME
- (aver (not (minusp inner-enclosed-profiles))) ; REMOVEME
- (let ((net-dticks (fastbig- dticks *enclosed-ticks*)))
- (when (minusp net-dticks) ; REMOVEME
- (error "huh? DTICKS=~S, *ENCLOSED-TICKS*=~S"
- dticks *enclosed-ticks*))
- (fastbig-incf-pcounter-or-fixnum ticks net-dticks))
- (let ((net-dconsing (fastbig- dconsing *enclosed-consing*)))
- (when (minusp net-dconsing) ; REMOVEME
- (error "huh? DCONSING=~S, *ENCLOSED-CONSING*=~S"
- dticks *enclosed-ticks*))
- (fastbig-incf-pcounter-or-fixnum consing net-dconsing))
- (fastbig-incf-pcounter-or-fixnum profiles
- inner-enclosed-profiles)))
+ (let ((*computing-profiling-data-for* encapsulated-fun)
+ (dynamic-usage-1 (sb-kernel:dynamic-usage)))
+ (setf dticks (fastbig- (get-internal-ticks) start-ticks))
+ (setf dconsing
+ (if (and (eq (pcounter-integer nbf-pcounter)
+ nbf0-integer)
+ (eq (pcounter-fixnum nbf-pcounter)
+ nbf0-fixnum))
+ ;; common special case where we can avoid
+ ;; bignum arithmetic
+ (- dynamic-usage-1
+ dynamic-usage-0)
+ ;; general case
+ (- (get-bytes-consed)
+ nbf0-integer
+ nbf0-fixnum
+ dynamic-usage-0)))
+ (setf inner-enclosed-profiles
+ (pcounter-or-fixnum->integer *enclosed-profiles*))
+ (let ((net-dticks (fastbig- dticks *enclosed-ticks*)))
+ (fastbig-incf-pcounter-or-fixnum ticks net-dticks))
+ (let ((net-dconsing (fastbig- dconsing *enclosed-consing*)))
+ (fastbig-incf-pcounter-or-fixnum consing net-dconsing))
+ (fastbig-incf-pcounter-or-fixnum profiles
+ inner-enclosed-profiles))))
(fastbig-incf-pcounter-or-fixnum *enclosed-ticks* dticks)
(fastbig-incf-pcounter-or-fixnum *enclosed-consing* dconsing)
(fastbig-incf-pcounter-or-fixnum *enclosed-profiles*
inner-enclosed-profiles)))))
;; READ-STATS-FUN
(lambda ()
- (format t "/entering READ-STATS-FUN ~S ~S ~S ~S~%"
- count ticks consing profiles) ; REMOVEME (and M-V-PROG1 below)
- (multiple-value-prog1
- (values (pcounter-or-fixnum->integer count)
- (pcounter-or-fixnum->integer ticks)
- (pcounter-or-fixnum->integer consing)
- (pcounter-or-fixnum->integer profiles))
- (print "/returning from READ-STATS-FUN")))
+ (values (pcounter-or-fixnum->integer count)
+ (pcounter-or-fixnum->integer ticks)
+ (pcounter-or-fixnum->integer consing)
+ (pcounter-or-fixnum->integer profiles)))
;; CLEAR-STATS-FUN
(lambda ()
(setf count 0
(max raw-compensated 0.0)))
(defun report ()
- "Report results from profiling. The results are
-approximately adjusted for profiling overhead, but when RAW is true
-the unadjusted results are reported. The compensation may be somewhat
-inaccurate when bignums are involved in runtime calculation, as in
-a very-long-running Lisp process."
+ "Report results from profiling. The results are approximately adjusted
+for profiling overhead. The compensation may be rather inaccurate when
+bignums are involved in runtime calculation, as in a very-long-running
+Lisp process."
(declare #.*optimize-external-despite-byte-compilation*)
(unless (boundp '*overhead*)
(setf *overhead*
;;;; overhead estimation
;;; We average the timing overhead over this many iterations.
-(defconstant +timer-overhead-iterations+ 50000)
+;;;
+;;; (This is a variable, not a constant, so that it can be set in
+;;; .sbclrc if desired. Right now, that's an unsupported extension
+;;; that I (WHN) use for my own experimentation, but it might
+;;; become supported someday. Comments?)
+(declaim (type unsigned-byte *timer-overhead-iterations*))
+(defparameter *timer-overhead-iterations*
+ 500000)
;;; a dummy function that we profile to find profiling overhead
(declaim (notinline compute-overhead-aux))
;;; Return a newly computed OVERHEAD object.
(defun compute-overhead ()
+ (format *debug-io* "~&measuring PROFILE overhead..")
(flet ((frob ()
(let ((start (get-internal-ticks))
(fun (symbol-function 'compute-overhead-aux)))
- (dotimes (i +timer-overhead-iterations+)
+ (dotimes (i *timer-overhead-iterations*)
(funcall fun fun))
(/ (float (- (get-internal-ticks) start))
(float +ticks-per-second+)
- (float +timer-overhead-iterations+)))))
+ (float *timer-overhead-iterations*)))))
(let (;; Measure unprofiled calls to estimate call overhead.
(call-overhead (frob))
total-overhead
(setf internal-overhead
(/ (float time)
(float +ticks-per-second+)
- (float +timer-overhead-iterations+))))
+ (float *timer-overhead-iterations*))))
(unprofile compute-overhead-aux))
- (make-overhead :call call-overhead
- :total total-overhead
- :internal internal-overhead))))
+ (prog1
+ (make-overhead :call call-overhead
+ :total total-overhead
+ :internal internal-overhead)
+ (format *debug-io* "done~%")))))
;;; It would be bad to compute *OVERHEAD*, save it into a .core file,
-;;; then load old *OVERHEAD* value from the .core file into a
+;;; then load the old *OVERHEAD* value from the .core file into a
;;; different machine running at a different speed. We avoid this by
;;; erasing *CALL-OVERHEAD* whenever we save a .core file.
(pushnew (lambda ()
projects / sbcl.git / blobdiff