[Trilinos-Users] [EXTERNAL] Re: Tpetra and threads

[Zheng Da]

It works. Thanks,
Da

On Mon, Apr 13, 2015 at 6:26 PM, Bruno Turcksin
<bruno.turcksin at gmail.com> wrote:
> There is a problem with the ssl certificate. Personally, I just disable SSL
> when I need to clone Trilinos (it's not safe though). Try:
>
>  env GIT_SSL_NO_VERIFY=true git clone
> https:://software.sandia.gov/trilinos/repositories/publicTrilinos
>
> Best,
>
> Bruno
>
>
>
> On 04/13/2015 04:47 PM, Zheng Da wrote:
>>
>> Is the git repo available for everyone?
>>
>> $ git clone
>> https://software.sandia.gov/trilinos/repositories/publicTrilinos
>> Cloning into 'publicTrilinos'...
>> fatal: unable to access
>> 'https://software.sandia.gov/trilinos/repositories/publicTrilinos/':
>> server certificate verification failed. CAfile:
>> /etc/ssl/certs/ca-certificates.crt CRLfile: none
>>
>> On Mon, Apr 13, 2015 at 5:37 PM, Hoemmen, Mark <mhoemme at sandia.gov> wrote:
>>>
>>> public git repo (see trilinos.org)
>>>
>>> On 4/13/15, 3:26 PM, "Zheng Da" <zhengda1936 at gmail.com> wrote:
>>>
>>>> Hello Mark,
>>>>
>>>> Tpetra Lesson 07 doesn't exist in tpetra/core/example of v11.14.1.
>>>> Which version of Trilinos should I look at?
>>>>
>>>> Thanks,
>>>> Da
>>>>
>>>> On Mon, Apr 13, 2015 at 4:30 PM, Hoemmen, Mark <mhoemme at sandia.gov>
>>>> wrote:
>>>>>
>>>>>
>>>>> On 4/13/15, 12:00 PM, "trilinos-users-request at software.sandia.gov"
>>>>> <trilinos-users-request at software.sandia.gov> wrote:
>>>>>>
>>>>>> Message: 1
>>>>>> Date: Mon, 13 Apr 2015 15:49:21 +0200
>>>>>> From: Martin Vymazal <martin.vymazal at vki.ac.be>
>>>>>> To: trilinos-users at software.sandia.gov
>>>>>> Subject: [Trilinos-Users] Tpetra and threads
>>>>>> Message-ID: <2697171.BCGQzWlqIO at tinlaptop>
>>>>>> Content-Type: text/plain; charset="us-ascii"
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I have a toy FE problem, for which I use Tpetra map, and Tpetra CRS
>>>>>> matrix to
>>>>>> store and solve the linear system. Everything works fine when I run
>>>>>> the
>>>>>> code in
>>>>>> serial, but when I try assembly with 2 threads (using std::thread from
>>>>>> C++11),
>>>>>> I get memory crashes.
>>>>>>
>>>>>> What I'm trying to do is this:
>>>>>> 1) Initialize system matrix (in serial)
>>>>>> 2) Run assembly with multiple threads (that I launched outside of
>>>>>> Trilinos)
>>>>>> 3) When assembly is finished and threads join, solve the linear system
>>>>>> (in
>>>>>> serial again)
>>>>>>
>>>>>> I understand that this is not the best/most optimal way, but all I
>>>>>> wanted
>>>>>> to
>>>>>> try is a simple test and it would really help me if I could ask
>>>>>> Tpetra/Kokkos
>>>>>> not to get in my way. From the output it seems that Kokkos starts
>>>>>> automatically its own thread and it probably does not like the fact
>>>>>> that
>>>>>> later
>>>>>> on, different number of threads accumulate in the system matrix.
>>>>>>
>>>>>> I get the following:
>>>>>>
>>>>>> Kokkos::HostSpace::decrement( 0x168c180 ) ERROR :  memory not being
>>>>>> tracked
>>>>>>
>>>>>> I searched for examples how to set the Tpetra map parameters in order
>>>>>> to
>>>>>> control the number of threads, but they all only show how (not) to use
>>>>>> MPI,
>>>>>> nothing said about multithreading ... Is what I'm trying to do
>>>>>> possible?
>>>>>> Can I
>>>>>> tell Trilinos 'not to worry' about my threads?
>>>>>>
>>>>>> Thank you for your help,
>>>>>>
>>>>>> Martin Vymazal
>>>>>
>>>>> Hi Martin,
>>>>>
>>>>> Please see Tpetra Lesson 07 (in tpetra/core/example) for a
>>>>> demonstration
>>>>> of thread-parallel sparse matrix construction and fill.  The interface
>>>>> of
>>>>> Tpetra::CrsMatrix does not promise thread safety; we have a lower-level
>>>>> interface (which the example uses) that does.
>>>>>
>>>>> mfh
>>>>>
>>>>> _______________________________________________
>>>>> Trilinos-Users mailing list
>>>>> Trilinos-Users at software.sandia.gov
>>>>> https://software.sandia.gov/mailman/listinfo/trilinos-users
>>
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