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RAMCloud has a fairly extensive internal metrics-gathering infrastructure. The RawMetrics class defines a number of subsystem-grouped uint64_t counters that are maintained by various subsystemsmodules. For example, every RPC opcode serviced increments an operation count counter and a ticks counter (cpu cycles spent executing the operation) such as 'rpc.ReadCount' and 'rpc.ReadTicks'.
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CycleCounter<> ticks; // default template type is uint64_t
... do something ...
printf("took %lu ticks\n", ticks.stop());
extern uint64_t globalWeirdConditionCounter;
if (someConditionRequiringWork) {
CycleCounter<> ticksticks2(&globalWeirdConditionCounter);
... do the work ...
// the ticksticks2 destructor will call stop() and apply the
// delta to globalWeirdConditionCounter automatically.
}
printf("Spent a total of %f seconds in weird condition\n",
Cycles::toSeconds(globalWeirdConditionCounter)); |
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