This documents a run of WarpX with in situ visualization using Ascent and VTK-m. The simulation was run on Frontier (OLCF). ECP project ALPINE provides GPU capable C++ libraries (Conduit, Ascent, VTK-h) that can use VTK-m for rendering of multi-source, multi-camera scenes. Using Ascent and VTK-m, both a WarpX simulation and a coupled in situ visualization were run on over 500 Frontier GPUs. WarpX documentation: https://warpx.readthedocs.io Ascent documentation: https://ascent.readthedocs.io

WarpX is supported by the Exascale Computing Project (17-SC-20-SC), a collaborative effort of two U.S. Department of Energy organizations (Office of Science and the National Nuclear Security Administration) responsible for the planning and preparation of a capable exascale ecosystem, including software, applications, hardware, advanced system engineering, and early testbed platforms, in support of the nation's exascale computing imperative.