[Openmp-dev] Query regarding the ICV: 'nthreads-var'

[Jini Susan George via Openmp-dev]

Thanks a bunch, Andrey!

- Jini


On Mon, Nov 18, 2019 at 9:24 PM Churbanov, Andrey <
Andrey.Churbanov at intel.com> wrote:

> Hi Jini,
>
>
>
> Your judgement basically looks correct.  Besides that
> current_nesting_level should be lesser than (used – 1) in order to
> enumerate __kmp_nested_nth.nth array. I’d also guess that you meant “at any
> point” of user’s code, as at the start of parallel region the nthreads-var
> is changing inside the runtime library code along with changing of nesting
> level.
>
>
>
> Regards,
>
> Andrey
>
>
>
> *From:* Openmp-dev [mailto:openmp-dev-bounces at lists.llvm.org] *On Behalf
> Of *Jini Susan George via Openmp-dev
> *Sent:* Monday, November 18, 2019 8:09 AM
> *To:* openmp-dev at lists.llvm.org
> *Subject:* [Openmp-dev] Query regarding the ICV: 'nthreads-var'
>
>
>
> Hi folks,
>
>
>
> I am working on modifying OMPD (in the
> OpenMPToolsInterface/LLVM-openmp/ompd-tests branch) to retrieve the value
> of the ICV ‘nthreads-var’. ‘nthreads-var’ is a list and as per my
> understanding, the value of this list at any point for a particular thread
> would be:
>
>
>
> [this_thr->th.th_current_task->td_icvs.nproc,
> __kmp_nested_nth.nth[current_nesting_level +1],
> __kmp_nested_nth.nth[current_nesting_level + 2], …,
> __kmp_nested_nth.nth[used - 1]]
>
>
>
> Except for the first element of this list, the other elements of this list
> are subject to the condition that current_nesting_level  is less
> than __kmp_nested_nth.used. Wanted to confirm with you folks that my
> understanding is correct. Please correct me otherwise.
>
>
>
> Thanks a bunch,
>
> Jini.
>
>
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