Classes
struct	MemoryStats

Functions
double	get_cpu_load ()

std::string	get_current_vectorization_level ()

void	get_memory_stats (MemoryStats &stats)

std::string	get_hostname ()

std::string	get_time ()

std::string	get_date ()

void	posix_memalign (void **memptr, std::size_t alignment, std::size_t size)

bool	job_supports_mpi ()

Detailed Description

A namespace for utility functions that probe system properties.

Function Documentation

◆ get_cpu_load()

double Utilities::System::get_cpu_load ( )

Return the CPU load as returned by "uptime". Note that the interpretation of this number depends on the actual number of processors in the machine. This is presently only implemented on Linux, using the /proc/loadavg pseudo-file, on other systems we simply return zero.

Definition at line 930 of file utilities.cc.

◆ get_current_vectorization_level()

std::string Utilities::System::get_current_vectorization_level ( )

Return the instruction set extension for vectorization as described by DEAL_II_VECTORIZATION_WIDTH_IN_BITS in vectorization.h as a string. The list of possible return values is:

`VECTORIZATION_LEVEL`	Return Value	Width in bits
0	disabled	64
1	SSE2/AltiVec	128
2	AVX	256
3	AVX512	512

Definition at line 938 of file utilities.cc.

◆ get_memory_stats()

void Utilities::System::get_memory_stats ( MemoryStats & stats )

Fill the stats structure with information about the memory consumption of this process. This is only implemented on Linux.

Definition at line 964 of file utilities.cc.

◆ get_hostname()

std::string Utilities::System::get_hostname ( )

Return the name of the host this process runs on.

Definition at line 998 of file utilities.cc.

◆ get_time()

std::string Utilities::System::get_time ( )

Return the present time as HH:MM:SS.

Definition at line 1013 of file utilities.cc.

◆ get_date()

std::string Utilities::System::get_date ( )

Return the present date as YYYY/MM/DD. MM and DD may be either one or two digits.

Definition at line 1029 of file utilities.cc.

◆ posix_memalign()

void Utilities::System::posix_memalign	(	void **	memptr,
		std::size_t	alignment,
		std::size_t	size
	)

Call the system function posix_memalign, or a replacement function if not available, to allocate memory with a certain minimal alignment. The first argument will then return a pointer to this memory block that can be released later on through a standard free call.

Parameters

memptr	The address of a pointer variable that will after this call point to the allocated memory.
alignment	The minimal alignment of the memory block, in bytes.
size	The size of the memory block to be allocated, in bytes.

Note: This function checks internally for error codes, rather than leaving this task to the calling site.

Definition at line 1044 of file utilities.cc.

◆ job_supports_mpi()

bool Utilities::System::job_supports_mpi ( )

Definition at line 1074 of file utilities.cc.

Classes

Functions