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104 lines
2.2 KiB
104 lines
2.2 KiB
#pragma once
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#include <stdint.h>
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#include "lock.h"
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#include "runtime.h"
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#include "worker_thread.h"
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/* Should be Power of 2! */
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#define PERF_WINDOW_BUFFER_SIZE 16
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#if ((PERF_WINDOW_BUFFER_SIZE == 0) || (PERF_WINDOW_BUFFER_SIZE & (PERF_WINDOW_BUFFER_SIZE - 1)) != 0)
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#error "PERF_WINDOW_BUFFER_SIZE must be power of 2!"
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#endif
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struct perf_window {
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uint64_t buffer[PERF_WINDOW_BUFFER_SIZE];
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uint64_t count;
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lock_t lock;
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double mean;
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};
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/**
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* Iterates through the values in the buffer and updates the mean
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* Not intended to be called directly!
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* @param self
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*/
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static inline void
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perf_window_update_mean(struct perf_window *self)
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{
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assert(self != NULL);
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assert(LOCK_IS_LOCKED(&self->lock));
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uint64_t limit = self->count;
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if (limit > PERF_WINDOW_BUFFER_SIZE) { limit = PERF_WINDOW_BUFFER_SIZE; }
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uint64_t sum = 0;
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for (uint64_t i = 0; i < limit; i++) sum += self->buffer[i];
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self->mean = (double)(sum) / limit;
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};
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/**
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* Iterates through the values in the buffer and updates the mean
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* Not intended to be called directly!
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* @param self
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*/
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static inline void
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perf_window_initialize(struct perf_window *self)
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{
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assert(self != NULL);
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LOCK_INIT(&self->lock);
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self->count = 0;
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self->mean = 0;
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memset(&self->buffer, 0, sizeof(uint64_t) * PERF_WINDOW_BUFFER_SIZE);
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}
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/**
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* Iterates through the values in the buffer and updates the mean
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* Not intended to be called directly!
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* @param self
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* @param value
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*/
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static inline void
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perf_window_add(struct perf_window *self, uint64_t value)
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{
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assert(self != NULL);
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/* A successful invocation should run for a non-zero amount of time */
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assert(value > 0);
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LOCK_LOCK(&self->lock);
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self->buffer[self->count++ % PERF_WINDOW_BUFFER_SIZE] = value;
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perf_window_update_mean(self);
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LOCK_UNLOCK(&self->lock);
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}
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/**
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* Returns mean perf value across all executions
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* @returns mean or -1 if buffer is empty
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*/
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static inline double
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perf_window_get_mean(struct perf_window *self)
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{
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assert(self != NULL);
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if (self->count == 0) return -1;
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return self->mean;
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}
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/**
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* Returns the total count of executions
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* @returns total count
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*/
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static inline uint64_t
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perf_window_get_count(struct perf_window *self)
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{
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assert(self != NULL);
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return self->count;
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}
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