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Comment:cherrypick [8ad25ef9eb] from 8.6 - timerate: added dynamic factor by threshold calculation (avoid growing of the execution time if iterations are not consistent, e. g. wax continuously on time)
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SHA3-256:fd80b4356eabc3f1ed6f832b77b952c5d0a87ccccf0fc69ccd4071a6aba613d4
User & Date: sergey.brester 2019-02-12 19:35:37
Context
2019-02-12
19:38
timerate: allow break from measurement cycle (usable to provide conditional stop possibility inside ... check-in: 11760d10b0 user: sergey.brester tags: sebres-8-5-timerate
19:35
cherrypick [8ad25ef9eb] from 8.6 - timerate: added dynamic factor by threshold calculation (avoid gr... check-in: fd80b4356e user: sergey.brester tags: sebres-8-5-timerate
18:41
merge 8.5 (note: to avoid too many conflicts, merged using `fossil merge --baseline 0055a16a8b core-... check-in: 0e846f3e6f user: sergey.brester tags: sebres-8-5-timerate
2019-02-07
21:20
timerate: added dynamic factor by threshold calculation (avoid growing of the execution time if iter... check-in: 8ad25ef9eb user: sebres tags: sebres-8-6-timerate
Changes
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Changes to generic/tclCmdMZ.c.

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{
    static 
    double measureOverhead = 0; /* global measure-overhead */
    double overhead = -1;	/* given measure-overhead */
    register Tcl_Obj *objPtr;
    register int result, i;
    Tcl_Obj *calibrate = NULL, *direct = NULL;
    Tcl_WideInt count = 0;	/* Holds repetition count */
    Tcl_WideInt maxms = -0x7FFFFFFFFFFFFFFFL; 
				/* Maximal running time (in milliseconds) */
    Tcl_WideInt threshold = 1;	/* Current threshold for check time (faster
				 * repeat count without time check) */
    Tcl_WideInt maxIterTm = 1;	/* Max time of some iteration as max threshold
				 * additionally avoid divide to zero (never < 1) */


    register Tcl_WideInt start, middle, stop;
#ifndef TCL_WIDE_CLICKS
    Tcl_Time now;
#endif

    static const char *const options[] = {
	"-direct",	"-overhead",	"-calibrate",	"--",	NULL
................................................................................
	Tcl_GetTime(&now);
	middle = now.sec; middle *= 1000000; middle += now.usec;
    #endif
	if (middle >= stop) {
	    break;
	}

	/* don't calculate threshold by few iterations, because sometimes
	 * first iteration(s) can be too fast (cached, delayed clean up, etc) */
	if (count < 10) {
	   threshold = 1; continue;
	}

	/* average iteration time in microsecs */
	threshold = (middle - start) / count;
	if (threshold > maxIterTm) {
	    maxIterTm = threshold;





	}








	/* as relation between remaining time and time since last check */


	threshold = ((stop - middle) / maxIterTm) / 4;
	if (threshold > 100000) {	    /* fix for too large threshold */
	    threshold = 100000;
	}
    }

    {
	Tcl_Obj *objarr[8], **objs = objarr;







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{
    static 
    double measureOverhead = 0; /* global measure-overhead */
    double overhead = -1;	/* given measure-overhead */
    register Tcl_Obj *objPtr;
    register int result, i;
    Tcl_Obj *calibrate = NULL, *direct = NULL;
    Tcl_WideUInt count = 0;	/* Holds repetition count */
    Tcl_WideInt maxms = -0x7FFFFFFFFFFFFFFFL; 
				/* Maximal running time (in milliseconds) */
    Tcl_WideUInt threshold = 1;	/* Current threshold for check time (faster
				 * repeat count without time check) */
    Tcl_WideUInt maxIterTm = 1;	/* Max time of some iteration as max threshold
				 * additionally avoid divide to zero (never < 1) */
    unsigned short factor = 50;	/* Factor (4..50) limiting threshold to avoid
				 * growth of execution time. */
    register Tcl_WideInt start, middle, stop;
#ifndef TCL_WIDE_CLICKS
    Tcl_Time now;
#endif

    static const char *const options[] = {
	"-direct",	"-overhead",	"-calibrate",	"--",	NULL
................................................................................
	Tcl_GetTime(&now);
	middle = now.sec; middle *= 1000000; middle += now.usec;
    #endif
	if (middle >= stop) {
	    break;
	}

	/* don't calculate threshold by few iterations, because sometimes first
	 * iteration(s) can be too fast or slow (cached, delayed clean up, etc) */
	if (count < 10) {
	   threshold = 1; continue;
	}

	/* average iteration time in microsecs */
	threshold = (middle - start) / count;
	if (threshold > maxIterTm) {
	    maxIterTm = threshold;
	    /* interations seems to be longer */
	    if (threshold > (maxIterTm * 2)) {
		if ((factor *= 2) > 50) factor = 50;
	    } else {
		if (factor < 50) factor++;
	    }
	} else if (factor > 4) {
	    /* interations seems to be shorter */
	    if (threshold < (maxIterTm / 2)) {
		if ((factor /= 2) < 4) factor = 4;
	    } else {
		factor--;
	    }
	}
	/* as relation between remaining time and time since last check,
	 * maximal some % of time (by factor), so avoid growing of the execution time
	 * if iterations are not consistent, e. g. wax continuously on time) */
	threshold = ((stop - middle) / maxIterTm) / factor + 1;
	if (threshold > 100000) {	    /* fix for too large threshold */
	    threshold = 100000;
	}
    }

    {
	Tcl_Obj *objarr[8], **objs = objarr;