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Publish minor changes to readme and configure files in main directory. Main directory and code directory licence texts are now fully updated. Copied from Perforce Change: 196994
126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/* meter.c: METERS
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*
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* $Id$
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* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
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*/
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#include "meter.h"
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#include "mpm.h"
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SRCID(meter, "$Id$");
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/* MeterInit -- initialize a meter */
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void MeterInit(Meter meter, const char *name, void *owner)
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{
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Word sym;
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meter->name = name;
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meter->count = 0;
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meter->total = 0.0;
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meter->meanSquared = 0.0;
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meter->max = 0;
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meter->min = (Size)-1;
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sym = EventInternString(name);
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EventLabelPointer(meter, sym);
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EVENT2(MeterInit, meter, owner);
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}
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/* MeterAccumulate -- accumulate another data point in the meter */
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void MeterAccumulate(Meter meter, Size amount)
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{
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Count count = meter->count + 1;
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double total = meter->total;
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double meanSquared = meter->meanSquared;
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double dcount = (double)count;
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/* .limitation.variance: This computation accumulates a running
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* mean^2, minimizing overflow, but sacrificing numerical stability
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* for small variances. For more accuracy, the data set should be
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* emitted using a telemetry stream and analyzed off-line.
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.stddev: stddev = sqrt(meanSquared - mean^2).
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*/
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meter->count = count;
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meter->total = total + amount;
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meter->meanSquared =
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meanSquared / dcount * (dcount - 1.0)
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+ amount / dcount * amount;
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if (amount > meter->max)
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meter->max = amount;
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if (amount < meter->min)
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meter->min = amount;
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}
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/* MeterWrite -- describe method for meters */
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Res MeterWrite(Meter meter, mps_lib_FILE *stream, Count depth)
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{
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Res res = ResOK;
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res = WriteF(stream, depth,
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"meter \"$S\" {", (WriteFS)meter->name,
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"count: $U", (WriteFU)meter->count,
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NULL);
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if (res != ResOK)
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return res;
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if (meter->count > 0) {
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double mean = meter->total / (double)meter->count;
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res = WriteF(stream, 0,
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", total $D", (WriteFD)meter->total,
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", max $U", (WriteFU)meter->max,
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", min $U", (WriteFU)meter->min,
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", mean $D", (WriteFD)mean,
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", meanSquared $D", (WriteFD)meter->meanSquared,
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NULL);
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if (res != ResOK)
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return res;
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}
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res = WriteF(stream, 0, "}\n", NULL);
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return res;
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}
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/* MeterEmit -- emit an event with the current data from the meter */
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void MeterEmit(Meter meter)
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{
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EVENT6(MeterValues, meter, meter->total, meter->meanSquared,
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meter->count, meter->max, meter->min);
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2020 Ravenbrook Limited <http://www.ravenbrook.com/>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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