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doku:papi_ir [2016/06/23 13:19] – [Interfacing with PAPI : Low level interface] ir | doku:papi_ir [2016/07/06 11:34] – [Interfacing with PAPI : High level interface] ir | ||
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==== Interfacing with PAPI : Low level interface ==== | ==== Interfacing with PAPI : Low level interface ==== | ||
- | In general, some code section to be analyzed with PAPI needs to be wrapped into a sequence of standard PAPI calls. | + | In general, some code section to be analyzed with PAPI needs to be wrapped into a sequence of standard PAPI calls, e.g., like in the following |
- | Here, code examples for | + | * [[doku: |
- | * [[doku: | + | * [[doku: |
- | * [[doku: | + | As stated in the comment of the C code above, it is best to analyze one particular event at a time. This advice is given because the CPU has limitations in combining arbitrary counters at a time. |
- | As stated in the comment of the C code above, it is best to analyze one particular event at a time. This advice is given because the CPU has limitations in combining arbitrary counters at a time. | + | |
==== Interfacing with PAPI : High level interface ==== | ==== Interfacing with PAPI : High level interface ==== | ||
- | The high-level API combines the counters for a specified list of PAPI preset events, only. The set of implemented high level functions is quite limited and can be found in the section '' | + | The high level API combines the counters for a specified list of PAPI preset events, only. The set of implemented high level functions is quite limited and can be found in the section '' |
+ | Example code in | ||
+ | * [[doku: | ||
+ | * [[doku: | ||
+ | is provided. The high level API can also be used in conjunction with the low level API. | ||
==== Practical tips: ==== | ==== Practical tips: ==== | ||
* A quick overview of supported events and corresponding PAPI variables for a particular type of CPU is obtained from executing command '' | * A quick overview of supported events and corresponding PAPI variables for a particular type of CPU is obtained from executing command '' |