unuma.cpp File Reference

#include "precompiled.h"
#include "lib/sysdep/numa.h"
#include "lib/bits.h"
#include "lib/sysdep/os_cpu.h"

Include dependency graph for unuma.cpp:

Functions
size_t	numa_NumNodes ()
size_t	numa_NodeFromProcessor (size_t processor)
uintptr_t	numa_ProcessorMaskFromNode (size_t node)
size_t	numa_AvailableMemory (size_t node)
double	numa_Factor ()
bool	numa_IsMemoryInterleaved ()

Function Documentation

numa_AvailableMemory()

size_t numa_AvailableMemory

(

size_t

node

)

Parameters

node

Returns

bytes of memory available for allocation on <node>.

numa_Factor()

double numa_Factor

(

)

Returns

the ratio between maximum and minimum times that one processor from each node required to fill a globally allocated array. in other words, this is the maximum slowdown for NUMA-oblivious memory accesses. Microsoft guidelines require it to be <= 3.

numa_IsMemoryInterleaved()

bool numa_IsMemoryInterleaved

(

)

Returns

an indication of whether memory pages are node-interleaved.

note: this requires ACPI access, which may not be available on least-permission accounts. the default is to return false so as not to cause callers to panic and trigger performance warnings.

numa_NodeFromProcessor()

size_t numa_NodeFromProcessor

(

size_t

processor

)

Parameters

processor

Returns

node number (zero-based) to which <processor> belongs.

numa_NumNodes()

size_t numa_NumNodes

(

)

Returns

number of NUMA "nodes" (i.e. groups of CPUs with local memory).

numa_ProcessorMaskFromNode()

uintptr_t numa_ProcessorMaskFromNode

(

size_t

node

)

Parameters

node

Returns

bit-mask of all processors constituting <node>.