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MPI Domain-Decomposition w/o Space Charge #503

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ax3l opened this issue Jan 10, 2024 · 1 comment · Fixed by #504
Closed

MPI Domain-Decomposition w/o Space Charge #503

ax3l opened this issue Jan 10, 2024 · 1 comment · Fixed by #504
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bug: affects latest release Bug also exists in latest release version bug Something isn't working component: core Core ImpactX functionality
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Advanced Methods ...

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ax3l commented Jan 10, 2024 •
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Yesterday, I realized that domain decomposition and load balancing with MPI is broken when space charge is not used. All particles end up on the same MPI rank now, causing load imbalance. Need to investigate.

Seems to show up as an issue for N>2 ranks or so, because on ResizeMesh we pad the beam by 3x vacuum by default for dynamic mesh resizes.

Related to #498, but likely earlier caused by #181 / #261 / #367 / #402.
@ax3l ax3l added bug Something isn't working bug: affects latest release Bug also exists in latest release version labels Jan 10, 2024
@ax3l ax3l added this to the Advanced Methods (SciDAC) milestone Jan 10, 2024
@ax3l ax3l added the component: core Core ImpactX functionality label Jan 10, 2024
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ax3l commented Jan 10, 2024

I think in AmrCoreData::one_box_per_rank, we need to set the max_grid_size, if defaulted, to the blocking factor.

@ax3l ax3l self-assigned this Jan 10, 2024
@ax3l ax3l mentioned this issue Jan 10, 2024
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@ax3l ax3l closed this as completed in #504 Jan 28, 2024
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bug: affects latest release Bug also exists in latest release version bug Something isn't working component: core Core ImpactX functionality
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Advanced Methods (SciDAC-5)
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Fix: MPI-Distribution w/o SC ax3l/impactx
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