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Overview
| 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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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | sebres-8-5-timerate |
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| SHA3-256: |
fd80b4356eabc3f1ed6f832b77b952c5 |
| User & Date: | sergey.brester 2019-02-12 19:35:37 |
Context
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2019-02-12
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| 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 | |
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2019-02-07
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| 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
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;
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