Update index.md

Author: jthelot

content/news/2025-02-19-Eigth-Kokkos-tea-time/index.md

@@ -19,15 +19,19 @@ It can be followed on [Zoom](https://cnrs.zoom.us/j/97834891802?pwd=NXhzd2paY051
 
 Keigo Nitadori will give a talk on "Experience with Kokkos for Lattice QCD Code Bridge++"
 
-Keigo Nitadori is a technical scientist at RIKEN R-CCS.
+Keigo Nitadori is a technical scientist at RIKEN R-CCS. He has a Ph.D. in Science (defended in 2009), for Computational Astronomy; he specializes in high-performance gravitational N-body simulations and was recipient of the ACM Gordon Bell Prize in SC09 and SC12.
 
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 ## Experience with Kokkos for Lattice QCD Code Bridge++
 
+Keigo Nitadori will share some insights from his initial experience developing with the Kokkos framework. The target was a Lattice QCD code, specifically the Domain-wall Fermion kernel from a Japanese community code set, Bridge++.  
 
+One of the initial challenges was that even a simple "Hello World" code required adequate knowledge of CMAKE for successful builds, posing a significant barrier for first-time users. To integrate Kokkos with Bridge++ without disrupting their conventions, careful attention was paid to maintaining loose coupling through techniques like the pImpl idiom.
+
+Regarding performance, the NVIDIA GH200 environment delivered sufficient FLOPS and effective bandwidth, as expected from the GPU specifications. In contrast, the AMD MI250 environment presented significant unresolved performance challenges.
 
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