Re: [Starpu-devel] StarPU: questions about performance model

[Cedric Augonnet <cedric.augonnet@inria.fr>]

Hi,

Samuel certainly got the actual problem, this function was not exported in 
this old version, so you should simply upgrade StarPU to the latest version, 
and the problem should be fixed.

Best,
Cédric

Le 20 juin 2011 à 13:00, Leo Li a écrit :

> Yes, I have included <starpu_scheduler.h>, so I can compile it
> separately. The only problem is Iinking process can not succeed.
> 
> Is there any other ways to lookup performance data from external 
> application?
> 
> Thanks in advance.
> 
> 2011/6/20 Cédric Augonnet <cedric.augonnet@inria.fr>:
>> Hi,
>> 
>> Did you include <starpu_scheduler.h> in your code?
>> 
>> Best,
>> Cédric
>> 
>> On 20/06/2011 11:01, Leo Li wrote:
>>> 
>>> Hi, Sameul
>>> 
>>> I want to ask a silly question.
>>> 
>>> When I use @code{starpu_task_expected_length} from external
>>> application, I have link error  undefined reference to
>>> `starpu_task_expected_length(starpu_task*, starpu_perf_archtype)'.
>>> Could you tell me how to use this function from an external
>>> application?
>>> 
>>> Thanks in advance.
>>> 
>>> 
>>> On Fri, Jun 17, 2011 at 11:51 AM, Samuel Thibault
>>> <samuel.thibault@ens-lyon.org>  wrote:
>>>> 
>>>> Hello,
>>>> 
>>>> Leo Li, le Fri 17 Jun 2011 11:43:20 +0200, a écrit :
>>>>> 
>>>>> 1) There is one API(starpu_load_history_debug) which can be used to
>>>>> load history-based performance model. If the performance model have
>>>>> multiple entries for cpu, and given the size and layout of parameters
>>>>> I need to find the right entry. Does anybody know how to find the
>>>>> right entry according to size and layout of parameters? Which APIs
>>>>> should I use?
>>>>> 
>>>>> 2) Could someone send me more information or an example about
>>>>> regression model? How does it work?
>>>> 
>>>> I have just added these yesterday to the documentation:
>>>> 
>>>> “For instance, @code{tests/perfmodels/regression_based.c} uses a
>>>> regression-based performance model for the @code{memset} operation”
>>>> 
>>>> “The application can request time estimations from the StarPU performance
>>>> models by filling a task structure as usual without actually submitting
>>>> it. The data handles can be created by calling
>>>> @code{starpu_data_register}
>>>> functions with a @code{NULL} pointer (and need to be unregistered as
>>>> usual)
>>>> and the desired data sizes. The @code{starpu_task_expected_length} and
>>>> @code{starpu_task_expected_power} functions can then be called to get an
>>>> estimation of the task duration on a given arch.
>>>> @code{starpu_task_destroy}
>>>> needs to be called to destroy the dummy task afterwards.”
>>>> 
>>>> Samuel
>>>> 
>>> 
>>> 
>> 
>> 
> 
> 
> 
> -- 
> Faithful
> Lu Li
> 
> 
> Contact: +46704759692