RandomConcurrent_test Class Reference

Description

Test:

demonstrate simple access to random number generation, as well as the setup of controlled random number sequences.

See also

random.hpp

Definition at line 53 of file random-concurrent-test.cpp.

Classes
struct	Experiment
	Research setup to investigate concurrent access to a random generator. More...

Private Member Functions
void	benchmark_random_gen ()
void	investigate_concurrentAccess ()
virtual void	run (Arg arg)

Member Function Documentation

benchmark_random_gen()

void benchmark_random_gen ( )

inlineprivate

Test:

microbenchmark of various random number generators

Remarks

typical values

• rand() (trinomial generator) : 15ns / 10ns (O3)
• Mersenne twister 64bit : 55ns / 25ns (O3)
• reading /dev/urandom : 480ns / 470 (O3)

Definition at line 73 of file random-concurrent-test.cpp.

References lib::test::microBenchmark(), lib::test::anonymous_namespace{random-concurrent-test.cpp}::NUM_INVOKES, and lib::rani().

Here is the call graph for this function:

investigate_concurrentAccess()

void investigate_concurrentAccess ( )

inlineprivate

Test:

examine behaviour of PRNG under concurrency stress

• running a 32bit generator single threaded should not trigger alarms
• while under concurrent pressure several defect numbers should be produced
• even the 64bit generator will show uneven distribution due to corrupted state
• the 32bit generator capped to its valid range exhibits skew only occasionally

See also

lib::CappedGen

Definition at line 200 of file random-concurrent-test.cpp.

References lib::defaultGen, RandomConcurrent_test::Experiment< GEN, threads >::perform(), and RandomSequencer< GEN >::uni().

Here is the call graph for this function:

Inheritance diagram for RandomConcurrent_test:

Collaboration diagram for RandomConcurrent_test:

---

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

• random-concurrent-test.cpp