/* Meter the system load */
void meter_getLoad(meter_sysload_t *load) {
static int updateDelay = -1;
if (updateDelay-- >= 0) {
return;
}
updateDelay = MEASURE_LOAD_EVERY;
measureMemory(load);
measureCpuLoad(load);
// Delay IO measurement even more; empirical studies show that this gives us
// a lot better values.
static int ioDelay = -1;
if (ioDelay-- >= 0) {
return;
}
// The magical number 2 comes from a trial-and-error session. 2 looks nice.
ioDelay = 2;
measureIoLoad(load);
}
/* Initialize the load metering */
void meter_init(meter_sysload_t *load) {
#ifdef DEBUG
dynamic_accumulator_selftest();
#endif
load->user = dynamic_accumulator_create();
measureMemory(load);
load->nCpus = getCpuCount();
assert(load->nCpus > 0);
load->cpuLoad = calloc(load->nCpus, sizeof(int));
// Initialize the load histories and indices
load->cpuAccumulators = calloc(load->nCpus, sizeof(accumulator_t*));
for (int cpuNo = 0; cpuNo < load->nCpus; cpuNo++) {
load->cpuAccumulators[cpuNo] = accumulator_create(LOADSAMPLES / MEASURE_LOAD_EVERY);
}
IOMasterPort(bootstrap_port, &masterPort);
measureIoLoad(load);
}
Elapsed(MeasureProcessMemory measureProcessMemory = kNoMeasureProcessMemory)
: sec(), wallSec(), deltaBytes() {
measureMemory(measureProcessMemory);
}
void measureMemory(MeasureProcessMemory measureProcessMemory = kMeasureProcessMemory) {
measureMemory(measureProcessMemory == kMeasureProcessMemory);
}
/**
initialize with elapsed time from (already created/started) timer, and
optionally measure process memory.
*/
Elapsed(boost::timer::cpu_timer const& timer, MeasureProcessMemory measureProcessMemory,
double peakBytes = 0, double deltaBytes = 0)
: peakBytes(peakBytes), deltaBytes(deltaBytes) {
measureElapsed(timer);
measureMemory(measureProcessMemory);
}