foedus::debugging::RdtscWatch Class Reference

A RDTSC-based low-overhead stop watch. More...

Detailed Description

A RDTSC-based low-overhead stop watch.

Unlike foedus::debugging::StopWatch, this watch is extremely low-overhead thus can be used in performance sensitive places. Instead, it can only show cycles elapsed. You have to do the math to convert it to sec/ms/us/ns yourself. This doesn't take care of wrap around (VERY rare), either.

Definition at line 37 of file rdtsc_watch.hpp.

#include <rdtsc_watch.hpp>

Public Member Functions
	RdtscWatch () __attribute__((always_inline))
void	start () __attribute__((always_inline))
	Take current time tick. More...
uint64_t	stop () __attribute__((always_inline))
	Take another current time tick. More...
uint64_t	elapsed () const __attribute__((always_inline))

Constructor & Destructor Documentation

foedus::debugging::RdtscWatch::RdtscWatch ( )

inline

Definition at line 39 of file rdtsc_watch.hpp.

References start().

: started_(0), stopped_(0) { start(); }

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Member Function Documentation

uint64_t foedus::debugging::RdtscWatch::elapsed ( ) const

inline

Definition at line 52 of file rdtsc_watch.hpp.

Referenced by foedus::snapshot::LogReducerRef::append_log_chunk(), foedus::storage::masstree::SplitBorder::lock_existing_records(), foedus::storage::masstree::MasstreePartitioner::partition_batch(), foedus::assorted::spin_until(), and stop().

                                                {
    return stopped_ - started_;
  }

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void foedus::debugging::RdtscWatch::start ( )

inline

Take current time tick.

Definition at line 42 of file rdtsc_watch.hpp.

References foedus::debugging::get_rdtsc().

Referenced by RdtscWatch().

                                    {
    started_ = get_rdtsc();
  }

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uint64_t foedus::debugging::RdtscWatch::stop ( )

inline

Take another current time tick.

Returns elapsed nanosec.

Definition at line 47 of file rdtsc_watch.hpp.

References elapsed(), and foedus::debugging::get_rdtsc().

Referenced by foedus::snapshot::LogReducerRef::append_log_chunk(), foedus::storage::masstree::SplitBorder::lock_existing_records(), foedus::storage::masstree::MasstreePartitioner::partition_batch(), and foedus::assorted::spin_until().

                                       {
    stopped_ = get_rdtsc();
    return elapsed();
  }

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

• /home/shino/foedus_code/foedus-core/include/foedus/debugging/rdtsc_watch.hpp