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Full Discussion: Accessing TSC Register
Top Forums Programming Accessing TSC Register Post 302394063 by Corona688 on Wednesday 10th of February 2010 10:43:27 AM
Old 02-10-2010
TSC is in fact munged by dual or quad core systems, and also by power-saving features that change the CPU clock rate. In any event I'm not convinced your inline assembly is working, being raw hex there. I've found some source here with perhaps a better implementation:
Code:
/*
 * get_tsc()
 */
static unsigned long long get_tsc(void)
{
	unsigned long long tsc;
	__asm__ __volatile__ ("rdtsc" : "=A" (tsc));
	return tsc;
}

You may need to change 'long long' to just 'long' on 64-bit systems. Or better yet, #include <stdint.h> and use uint64_t for code that should work on both...
 

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hwloc_nodeset_from_linux_libnuma_ulongs

Helpers for manipulating Linux libnuma unsigned long masks(3)Hardware Locality (hwlocHelpers for manipulating Linux libnuma unsigned long masks(3)

NAME

       Helpers for manipulating Linux libnuma unsigned long masks -

   Functions
       static inline int hwloc_cpuset_to_linux_libnuma_ulongs (hwloc_topology_t topology, hwloc_const_cpuset_t cpuset, unsigned long *mask,
	   unsigned long *maxnode)
       static inline int hwloc_nodeset_to_linux_libnuma_ulongs (hwloc_topology_t topology, hwloc_const_nodeset_t nodeset, unsigned long *mask,
	   unsigned long *maxnode)
       static inline int hwloc_cpuset_from_linux_libnuma_ulongs (hwloc_topology_t topology, hwloc_cpuset_t cpuset, const unsigned long *mask,
	   unsigned long maxnode)
       static inline int hwloc_nodeset_from_linux_libnuma_ulongs (hwloc_topology_t topology, hwloc_nodeset_t nodeset, const unsigned long *mask,
	   unsigned long maxnode)

Detailed Description
Function Documentation
   static inline int hwloc_cpuset_from_linux_libnuma_ulongs (hwloc_topology_ttopology, hwloc_cpuset_tcpuset, const unsigned long *mask, unsigned
       longmaxnode) [static]
       Convert the array of unsigned long mask into hwloc CPU set. mask is a array of unsigned long that will be read. maxnode contains the
       maximal node number that may be read in mask.

       This function may be used after calling get_mempolicy or any other function that takes an array of unsigned long as output parameter (and
       possibly a maximal node number as input parameter).

   static inline int hwloc_cpuset_to_linux_libnuma_ulongs (hwloc_topology_ttopology, hwloc_const_cpuset_tcpuset, unsigned long *mask, unsigned
       long *maxnode) [static]
       Convert hwloc CPU set cpuset into the array of unsigned long mask. mask is the array of unsigned long that will be filled. maxnode contains
       the maximal node number that may be stored in mask. maxnode will be set to the maximal node number that was found, plus one.

       This function may be used before calling set_mempolicy, mbind, migrate_pages or any other function that takes an array of unsigned long and
       a maximal node number as input parameter.

   static inline int hwloc_nodeset_from_linux_libnuma_ulongs (hwloc_topology_ttopology, hwloc_nodeset_tnodeset, const unsigned long *mask,
       unsigned longmaxnode) [static]
       Convert the array of unsigned long mask into hwloc NUMA node set. mask is a array of unsigned long that will be read. maxnode contains the
       maximal node number that may be read in mask.

       This function may be used after calling get_mempolicy or any other function that takes an array of unsigned long as output parameter (and
       possibly a maximal node number as input parameter).

   static inline int hwloc_nodeset_to_linux_libnuma_ulongs (hwloc_topology_ttopology, hwloc_const_nodeset_tnodeset, unsigned long *mask, unsigned
       long *maxnode) [static]
       Convert hwloc NUMA node set nodeset into the array of unsigned long mask. mask is the array of unsigned long that will be filled. maxnode
       contains the maximal node number that may be stored in mask. maxnode will be set to the maximal node number that was found, plus one.

       This function may be used before calling set_mempolicy, mbind, migrate_pages or any other function that takes an array of unsigned long and
       a maximal node number as input parameter.

Author
       Generated automatically by Doxygen for Hardware Locality (hwloc) from the source code.

Version 1.7							  Sun Apr 7 2013     Helpers for manipulating Linux libnuma unsigned long masks(3)
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