Vc at MIC

[Kulakov, Igor]

Hi Matthias,

> There are failing tests for me as well, but the failures are in very special
features. Fixing those requires a lot of work. Most of the recent failures I
fixed were ICC bugs.

We see significant differences in tracking results with Vc-0.99 and Vc-0.7.2 using ICC-13.1.0. For example number of broken fast tracks (clones for ref set) is factor of 7(!) different. (see numbers below)
Meanwhile with VC_IMPL=Scalar both Vc-0.99 and Vc-0.7.2 give same result.

Do you have any suggestions how to proceed?

Regards,
Igor

Vc-0.99:
 ---- Global Performance 10 events Statistic ----
Track category         :  Eff   / Clones | All Reco | All MC
Allset    efficiency   : 0.920  / 0.290  | 7119  | 7740
Refset    efficiency   : 0.982  / 0.136  | 910  | 927
Extra     efficiency   : 0.911  / 0.310  | 6209  | 6813
Rest      efficiency   : 0.898  / 0.727  | 79  | 88
Ghost     probability  : 0.129 | 917
All reco tracks/ev : 711.900
Reconstruction Time Real =    767.606 ms, CPU =    767.000 ms, parallelization speedup: 0.998

Vc-0.7.2:
 ---- Global Performance 10 events Statistic ----
Track category         :  Eff   / Clones | All Reco | All MC
Allset    efficiency   : 0.944  / 0.113  | 7304  | 7740
Refset    efficiency   : 0.980  / 0.020  | 908  | 927
Extra     efficiency   : 0.939  / 0.126  | 6396  | 6813
Rest      efficiency   : 0.909  / 0.773  | 80  | 88
Ghost     probability  : 0.127 | 929
All reco tracks/ev : 730.400
Reconstruction Time Real =    146.283 ms, CPU =    145.000 ms, parallelization speedup: 0.981

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Sent: Friday, August 16, 2013 10:33 AM
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Subject: Re: Vc at MIC

On Tuesday 13 August 2013 20:19:52 Zyzak, Maksym wrote:
> I have compiled Vc-0.99.71 on the computer with MIC cards. And the test are
> failed. For the compilation I used icc 13.1.0.

I recommend to always update ICC to the latest version. I use ICC 13.1.2
20130514. There were some really strange miscompiles with the older compilers.

> The CPU is Intel(R) Xeon(R)
> CPU E5-2680. The log of test is given below. Can you please suggest what
> can be the problem? Should I use another version of Vc?

There are failing tests for me as well, but the failures are in very special
features. Fixing those requires a lot of work. Most of the recent failures I
fixed were ICC bugs.

--
Dipl.-Phys. Matthias Kretz

Web:   http://compeng.uni-frankfurt.de/?mkretz

SIMD easy and portable: http://compeng.uni-frankfurt.de/?vc

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