orrery::backend::ExecutorStatistics Struct Reference

The whole pool's record. More...

#include <orrery/backend/worker_statistics.hpp>

Public Member Functions
Duration	busy () const noexcept
	Busy time summed over workers.
Duration	idle () const noexcept
	Idle time summed over workers.
double	idle_fraction () const noexcept
	The fraction of available worker time that was spent waiting.

Public Attributes
std::vector< WorkerStatistics >	workers
	One entry per worker, in worker order.
Duration	elapsed {}
	Wall time spent inside parallel regions, measured by the submitting thread.
std::uint64_t	regions {}
	How many parallel regions have run.

Detailed Description

The whole pool's record.

Member Function Documentation

idle_fraction()

double orrery::backend::ExecutorStatistics::idle_fraction ( ) const

inlinenodiscardnoexcept

The fraction of available worker time that was spent waiting.

Zero when nothing has run, which is a truthful answer to the question rather than a division by zero. This is the headline number for the static against dynamic comparison: it is what a perfectly balanced scheduler drives towards zero, and what an unbalanced one cannot.

Member Data Documentation

elapsed

Duration orrery::backend::ExecutorStatistics::elapsed {}

Wall time spent inside parallel regions, measured by the submitting thread.

This is the denominator a speedup is formed against.

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The documentation for this struct was generated from the following file:

• orrery/backend/worker_statistics.hpp