OpenMP

ROOT
1

Hi everybody,

I have a “big” problem: I would like to use OpenMP (multi-threading) inside a QtRoot application. The problem is only on windows, because OpenMP is supported by GCC > 4 and VC++, but I’m using VC++ Express (not supported, :frowning: ).

My question: Is there a way to build root with Mingw? or I will need to rebuild everything with Cygwin (approx. 3 day of compilation)?

Thank you very much for any suggestion.
Cheers,

2

Hi,

No, Mingw is not supported (at least not by the official version of ROOT)

Cheers, Bertrand.

3

Hi Bertrand,

Thank you for the answer.
Is there a small probability that in a future Mingw will be supported?

Cheers,

4

Hi,

The probability is very small, as there is not many user requests and this would be yet another compiler to support…

Cheers, Bertrand.

5

Hi,

I would be curious to hear whether a regular VC express (i.e. without OpenMP) binary is really slower than the cygwin one with OpenMP. I bet the VC one will be much faster. I.e. there is no point in accelerating something by 10% when it’s 3 times slower to begin with… (Btw: the factor 3 is an arbitrary number not meant to reflect an actual timing study.)

Cheers, Axel.

6

Hi Axel,

Yes, I has the same curiosity, but do you know if is there a way to force manually VC++ Express to use OpenMP? I don’t know, for example installing the libs and dll and headers?

Cheers,