janwas
ffdff6888d
enable most of IA-32 specific code to be used in amd64 (resides in directory lib/sysdep/x86_x64) bits: add IsBitSet remove mem_PageSize (use os_cpu_PageSize instead) cpuid: change interface to allow gracefully supporting later subfunctions that require input parameters amd64_asm.asm: add amd64 implementation of cpuid cpu: move functions provided by OS to sysdep/os_cpu.cpp cpu topology: avoid trouble when process affinity is set by remapping processor numbers to 0..PopulationCount(processAffinity) topology.cpp: move ex-ia32 topology code here. This was SVN commit r5945.
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
#ifndef INCLUDED_NUMA
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#define INCLUDED_NUMA
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//-----------------------------------------------------------------------------
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// node topology
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/**
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* @return number of NUMA "nodes" (i.e. groups of CPUs with local memory).
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**/
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LIB_API size_t numa_NumNodes();
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/**
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* @return node number (zero-based) to which <processor> belongs.
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**/
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LIB_API size_t numa_NodeFromProcessor(size_t processor);
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/**
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* @return bit-mask of all processors constituting <node>.
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**/
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LIB_API uintptr_t numa_ProcessorMaskFromNode(size_t node);
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//-----------------------------------------------------------------------------
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// memory
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/**
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* @return bytes of memory available for allocation on <node>.
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**/
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LIB_API size_t numa_AvailableMemory(size_t node);
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/**
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* @return the ratio between maximum and minimum times that one processor
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* from each node required to fill a globally allocated array.
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* in other words, this is the maximum slowdown for NUMA-oblivious
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* memory accesses. Microsoft guidelines require it to be <= 3.
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**/
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LIB_API double numa_Factor();
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//-----------------------------------------------------------------------------
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// allocator
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/**
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* simple allocator that "does the right thing" on NUMA systems - page frames
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* will be taken from the node that first accesses them.
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**/
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LIB_API void* numa_Allocate(size_t size);
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enum LargePageDisposition
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{
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LPD_DEFAULT,
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LPD_ALWAYS,
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LPD_NEVER
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};
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/**
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* allocate memory from a specific node.
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*
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* @param node node number (zero-based)
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* @param largePageDisposition - allows forcibly enabling/disabling the use
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* of large pages; the default decision involves a heuristic.
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* @param pageSize if non-zero, receives the size [bytes] of a single page
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* out of those used to map the memory.
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**/
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LIB_API void* numa_AllocateOnNode(size_t size, size_t node, LargePageDisposition largePageDisposition = LPD_DEFAULT, size_t* pageSize = 0);
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/**
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* release memory that had been handed out by one of the above allocators.
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**/
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LIB_API void numa_Deallocate(void* mem);
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#ifdef __cplusplus
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// for use with shared_ptr
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template<typename T>
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struct numa_Deleter
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{
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void operator()(T* p) const
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{
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numa_Deallocate(p);
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}
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};
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#endif
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#endif // #ifndef INCLUDED_NUMA
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