8 problems
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The conjecture that IDA is only marginally faster than high-to-low flow routing
The IDA algorithm is a parallel algorithm for solving flow-routing and drainage-area linear systems, while the high-to-low method solves the corresponding system on a single core.…
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The dual-role conjecture for inverse participation ratio under power weighting
Let the inverse participation ratio (IPR) measure the concentration of the residual, and consider power-weighted sampling in an asynchronous randomized Jacobi method. Dual-role con…
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Conjecture on computational savings from time-parallel reduced-order modeling
The proposed reduced-order modeling ideas use randomized, time-parallel generation of reduced basis functions for a time-dependent problem. Computational-savings conjecture. The pr…
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Quantum parallelism efficiency conjecture
Consider a quantum parallel computation performed by a quantum parallel random-access machine, or QPRAM, and let its efficiency be the ratio of the serial work to the product of th…
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Scalability-boundary conjecture for sweeping preconditioners
Consider sweeping preconditioners for the high-frequency Helmholtz equation, used to solve a problem with a single right-hand side in a distributed-memory parallel computational en…
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The large-batchsize parallelisation conjecture for stochastic gradient MCMC
Large-batchsize parallelisation conjecture. In many scenarios, it will be better to use a large batchsize to reap the benefits of parallelisation.
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The maximum-to-expected iteration-time indicator conjecture
Maximum-to-expected iteration-time conjecture. A more useful indicator of the overlap parameter could be the maximum iteration time divided by the expected iteration time.
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The parallel-overhead explanation for serial methods outperforming parallel methods
The numerical tests compare serial methods with the parallel PIRK10 method for solving ordinary differential equations, including the HO, HH, and HH100 problems. The parallel overh…