07-17-2014
As far as I know AMD CPUs have the same number of threads as the number of cores. Intel CPUs have the HT technology, which exports more virtual CPUs to the operating system than the number of cores.
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LEARN ABOUT CENTOS
papi_num_cmp_hwctrs
PAPI_num_cmp_hwctrs(3) PAPI PAPI_num_cmp_hwctrs(3)
NAME
PAPI_num_cmp_hwctrs -
Return the number of hardware counters for the specified component.
SYNOPSIS
Detailed Description
PAPI_num_cmp_hwctrs() returns the number of counters present in the specified component. By convention, component 0 is always the cpu.
On some components, especially for CPUs, the value returned is a theoretical maximum for estimation purposes only. It might not be possible
to easily create an EventSet that contains the full number of events. This can be due to a variety of reasons: 1). Some CPUs (especially
Intel and POWER) have the notion of fixed counters that can only measure one thing, usually cycles. 2). Some CPUs have very explicit rules
about which event can run in which counter. In this case it might not be possible to add a wanted event even if counters are free. 3). Some
CPUs halve the number of counters available when running with SMT (multiple CPU threads) enabled. 4). Some operating systems 'steal' a
counter to use for things such as NMI Watchdog timers. The only sure way to see if events will fit is to attempt adding events to an
EventSet, and doing something sensible if an error is generated.
PAPI_library_init() must be called in order for this function to return anything greater than 0.
C Interface:
#include <papi.h>
int PAPI_num_cmp_hwctrs(int cidx );
Parameters:
cidx -- An integer identifier for a component. By convention, component 0 is always the cpu component.
Example
* // Query the cpu component for the number of counters.
* printf(
*
Returns:
On success, this function returns a value greater than zero.
A zero result usually means the library has not been initialized.
Author
Generated automatically by Doxygen for PAPI from the source code.
Version 5.2.0.0 Tue Jun 17 2014 PAPI_num_cmp_hwctrs(3)