Hi Robert,
I work on Linux-platform with pthreads and the 3 parameter sched_setaffinity()
command will be used. But now this is not anymore interesting, because I have a
working solution with using both of your suggestions together. Because it is a
little bit tricky (at least for me) I will present the solution, if anyone else
needs the same functionality:
1.) We need a new class subclassing DatabasePager. Within this class we need
following methods:
the constructor
the copy constructor
the descructor
clone()
className()
Here the code (I hope it looks correct, because in preview the [<] makes
problems!!):
Code:
#include <osgDB/DatabasePager>
class MyDatabasePager : public osgDB::DatabasePager
{
public:
MyDatabasePager() : osgDB::DatabasePager()
{
changeCpuAffinityOfDatabaseThreads();
}
MyDatabasePager(const MyDatabasePager& rhs)
: osgDB::DatabasePager(rhs)
{
changeCpuAffinityOfDatabaseThreads();
}
virtual const char* className() const
{
return "MyDatabasePager";
}
virtual MyDatabasePager* clone() const
{
return new MyDatabasePager(*this);
}
protected:
virtual ~MyDatabasePager() {};
void changeCpuAffinityOfDatabaseThreads()
{
unsigned int cpuNum = 3;
for (int i=0; i<getNumDatabaseThreads(); ++i)
{
getDatabaseThread(i)->setProcessorAffinity(cpuNum);
}
}
};
2.) As early as possible you should execute following code:
Code:
osgDB::DatabasePager::prototype() = new MyDatabasePager();
I hope I could help anyone with this code...
Robert: I think the submission would extend the flexibility of OSG, but throw
it away, if you do not like it, I can now solve my problem without it.
Cheers
Alois
robertosfield wrote:
> Hi WeSee,
>
> On 20 November 2014 14:57, We See < ()> wrote:Subclassing does not work,
> because addDatabaseThread() is called from the constructor of DatabasePager
> and calls therefore DatabasePager::addDatabaseThread() instead my overrided
> method.
>
>
> Interesting problem. Delaying the call to adding the threads would be one
> way around this. This would of course require.
>
>
>
> Calling DatabasePager::setUpThreads(..) manually would be a crude workaround
> using the present code too.
>
>
>
> > Using DatabasePager::getDatabaseThread(i) method and set the affinity with
> > setProcessorAffinity() was also not successful. I don't exactly know why,
> > but maybe it is because the method must be called before the thread is
> > started.
> >
>
> What platform are you working on?
>
>
> > Could you send me an example, how to change the processor-affinitiy with
> > your proposals? I have no more ideas, how do get this working, except with
> > my submission...
> >
>
>
> I have dozens of other submissions I'm working through right now so writing
> test examples for individual end users isn't something I can do right now.
>
> Robert.
>
>
>
> ------------------
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