104 lines
1.9 KiB
C++
104 lines
1.9 KiB
C++
/* -*- c++ -*- */
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#ifndef LOGHISTOGRAMSAMPLER_H
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#define LOGHISTOGRAMSAMPLER_H
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#include <assert.h>
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#include <inttypes.h>
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#include <math.h>
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#include <vector>
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#include "Operation.h"
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#define _POW 1.1
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class LogHistogramSampler {
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public:
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std::vector<uint64_t> bins;
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double sum;
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double sum_sq;
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LogHistogramSampler() = delete;
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LogHistogramSampler(int _bins) : sum(0.0) {
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assert(_bins > 0);
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bins.resize(_bins + 1, 0);
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}
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void sample(const Operation &op) {
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sample(op.time());
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}
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void sample(double s) {
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assert(s >= 0);
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size_t bin = log(s)/log(_POW);
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sum += s;
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sum_sq += s*s;
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// I("%f", sum);
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if ((int64_t) bin < 0) {
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bin = 0;
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} else if (bin >= bins.size()) {
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bin = bins.size() - 1;
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}
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bins[bin]++;
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}
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double average() {
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// I("%f %d", sum, total());
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return sum / total();
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}
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double stddev() {
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// I("%f %d", sum, total());
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return sqrt(sum_sq / total() - pow(sum / total(), 2.0));
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}
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double minimum() {
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for (size_t i = 0; i < bins.size(); i++)
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if (bins[i] > 0) return pow(_POW, (double) i + 0.5);
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DIE("Not implemented");
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}
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double get_nth(double nth) {
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uint64_t count = total();
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uint64_t n = 0;
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double target = count * nth/100;
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for (size_t i = 0; i < bins.size(); i++) {
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n += bins[i];
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if (n > target) { // The nth is inside bins[i].
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double left = target - (n - bins[i]);
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return pow(_POW, (double) i) +
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left / bins[i] * (pow(_POW, (double) (i+1)) - pow(_POW, (double) i));
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}
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}
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return pow(_POW, bins.size());
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}
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uint64_t total() {
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uint64_t sum = 0.0;
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for (auto i: bins) sum += i;
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return sum;
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}
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void accumulate(const LogHistogramSampler &h) {
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assert(bins.size() == h.bins.size());
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for (size_t i = 0; i < bins.size(); i++) bins[i] += h.bins[i];
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sum += h.sum;
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sum_sq += h.sum_sq;
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}
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};
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#endif // LOGHISTOGRAMSAMPLER_H
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