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a3c7ed0cab
Add missing initializer to mps_args_none. Change "char *" to "const char *" where necessary. Copied from Perforce Change: 183494 ServerID: perforce.ravenbrook.com
144 lines
4.7 KiB
C
144 lines
4.7 KiB
C
/* meter.c: METERS
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*
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* $Id$
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* Copyright (c) 2001-2013 Ravenbrook Limited. See end of file for license.
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*
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* TRANSGRESSIONS
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*
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* .trans.label: We label meters with EventLabelAddr, but of course that's
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* meant for labelling Addr's. We get away with it as long as the type
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* Meter is compatible with Addr.
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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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EventLabelAddr((Addr)meter, sym); /* see .trans.label */
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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)
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{
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Res res = ResOK;
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res = WriteF(stream,
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"meter $S {", meter->name,
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"count: $U", 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,
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", total: $D", meter->total,
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", max: $U", meter->max,
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", min: $U", meter->min,
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", mean: $D", mean,
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", mean^2: $D", 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, "}\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) 2001-2013 Ravenbrook Limited <http://www.ravenbrook.com/>.
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* All rights reserved. This is an open source license. Contact
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* Ravenbrook for commercial licensing options.
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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 distribution.
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*
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* 3. Redistributions in any form must be accompanied by information on how
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* to obtain complete source code for this software and any accompanying
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* software that uses this software. The source code must either be
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* included in the distribution or be available for no more than the cost
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* of distribution plus a nominal fee, and must be freely redistributable
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* under reasonable conditions. For an executable file, complete source
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* code means the source code for all modules it contains. It does not
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* include source code for modules or files that typically accompany the
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* major components of the operating system on which the executable file
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* runs.
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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, FITNESS FOR A PARTICULAR
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* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY 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 OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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