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Author: jbigot

content/news/2024-05-06-Eighth-CExA-coffee/20240318_YA_Kokkos-FFT.pdf

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+---
+title: "3 June 2024: eighth CExA coffee"
+subtitle: "Vectorisation and parallelisation of the neutron transport sweep algorithm on cartesian and hexagonal meshes using Kokkos"
+date: 2024-05-31
+---
+
+{{< cta cta_text="Register to be notified about future events" cta_link="https://lists.cexa-project.org/sympa/subscribe/network" >}}
+
+CExA organizes its ninth **CExA virtual coffee** on Monday, June the 3rd, 2024 starting at 1PM.
+It can be followed on [Zoom](https://cnrs.zoom.us/j/97834891802?pwd=NXhzd2paY051S3dQekVQVllvTW5MUT09), by [phone]({{< ref "#by-phone" >}}), from [a visio room]({{< ref "#from-a-visio-room" >}}) or from the [Mandelbrot room in the Digiteo Saclay building]({{< ref "#come-to-the-mandelbrot-room" >}}).
+
+Gabriel Suau will anigive a talk entitled "Vectorisation and parallelisation of the neutron transport sweep algorithm on cartesian and hexagonal meshes using Kokkos"
+
+
+## Vectorisation and parallelisation of the neutron transport sweep algorithm on cartesian and hexagonal meshes using Kokkos
+
+The deterministic resolution of the neutron transport equation consists in several nested iterative algorithms. For each iteration, a discretized transport operator must be inverted on the spatial domain for a set of discrete directions and energy groups. For each (cell, direction, group) triplet, a local solution can be computed by assembling and solving a small linear system (O(1-100)), where the right-hand-side depends on the solution of the immediate upstream neighbors of the cell, resulting in an ordered sweep of the mesh to get the global solution. In this talk, I will present a vectorized multithreaded sweep implementation that relies on Kokkos SIMD types, and the performance gains compared to a non-SIMD implementation.
+
+
+## Contribute
+
+Any subject is welcome if it is related to the Kokkos ecosystem (developments, usage, projects, issues, etc.) or even to GPU programming at large.
+Feel free to contact us to propose a talk: [email protected]
+
+We target very informal discussion in French or English. You can propose any subject for discussion even if you don't have a dedicated slide deck.
+
+
+## Additional info
+
+### Join us physically in the Mandelbrot room
+
+The Mandelbrot room of [Digiteo Saclay building](https://maps.app.goo.gl/dWmfDSAyc6TLkrnC9) is in Saclay center, near the Orphée entrance.
+<iframe src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d2631.8449189785!2d2.15407651328232!3d48.72755487119501!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x47e67f3d6ca35351%3A0xad658a7f81b4a1fe!2sMaison%20de%20la%20Simulation!5e0!3m2!1sen!2sfr!4v1690451425962!5m2!1sen!2sfr" width="600" height="450" style="border:0;" allowfullscreen="" loading="lazy" referrerpolicy="no-referrer-when-downgrade"></iframe>
+
+
+### Zoom link
+
+In a web browser or from the application.
+
+https://cnrs.zoom.us/j/97834891802?pwd=NXhzd2paY051S3dQekVQVllvTW5MUT09
+* Meeting ID: 978 3489 1802
+* Passcode: VdCL7d
+
+
+### From a visio room
+
+#### in SIP
+* [email protected]
+
+#### in H.323
+* 213.244.140.110 (Germany)
+* 213.19.144.110 (Amsterdam Netherlands)
+* 162.255.37.11 (US West)
+* 162.255.36.11 (US East)
+
+Meeting ID: 978 3489 1802
+
+Passcode: 712542
+
+###  One tap mobile
+
++33170950350,,97834891802#,,,,*712542# France
++33186995831,,97834891802#,,,,*712542# France
+
+### By phone
+
+* Meeting ID: 978 3489 1802
+* Passcode: 712542
+* Find your local number: https://cnrs.zoom.us/u/adb4LKJbkK
+
+Dial by your location
+* +33 1 7095 0350 France
+* +33 1 8699 5831 France
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