PAPI_disable_component(3) PAPI PAPI_disable_component(3)NAME
PAPI_disable_component -
disables the specified component
SYNOPSIS Detailed Description
@retval ENOCMP
component does not exist
@retval ENOINIT
cannot disable as PAPI has already been initialized
@param cidx
component index of component to be disabled
@par Examples:
int cidx, result;
cidx = PAPI_get_component_index("example");
if (cidx>=0) {
result = PAPI_disable_component(cidx);
if (result==PAPI_OK)
printf("The example component is disabled0);
}
// ...
PAPI_library_init();
*
PAPI_disable_component() allows the user to disable components before PAPI_library_init() time. This is useful if the user knows they do
not wish to use events from that component and want to reduce the PAPI library overhead.
PAPI_disable_component() must be called before PAPI_library_init().
See Also:
PAPI_get_event_component
PAPI_library_init
Author
Generated automatically by Doxygen for PAPI from the source code.
Version 5.2.0.0 Tue Jun 17 2014 PAPI_disable_component(3)
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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)
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