Re: [petsc-users] strong-scaling vs weak-scaling

And you can't get much more detail with hypre because it does not record performance data. Or can you get hypre to print its performance data? ML uses more PETSc stuff, you can get the PtAP time, which is most of the matrix setup. GAMG is native and has more timers. In addition to PtAP there is

Re: [petsc-users] strong-scaling vs weak-scaling

On 31/08/16 16:46, Mark Adams wrote: > And you can't get much more detail with hypre because it does not > record performance data. Or can you get hypre to print its performance > data? -pc_hypre_boomeramg_print_statistics -pc_hypre_boomeramg_print_debug Should give you some info, not sure it's

Re: [petsc-users] strong-scaling vs weak-scaling

On Wed, Aug 31, 2016 at 5:23 AM, Justin Chang wrote: > Matt, > > So is the "solve phase" going to be KSPSolve() - PCSetUp()? > Setup Phase: KSPSetUp + PCSetup Solve Phase: SNESSolve This contains SNESFunctionEval, SNESJacobianEval, KSPSolve Matt In other words, if

Re: [petsc-users] strong-scaling vs weak-scaling

Matt, So is the "solve phase" going to be KSPSolve() - PCSetUp()? In other words, if I want to look at time/iterations, should it just be over KSPSolve or should I exclude the PC setup? Justin On Wed, Aug 31, 2016 at 5:13 AM, Matthew Knepley wrote: > On Wed, Aug 31, 2016

Re: [petsc-users] strong-scaling vs weak-scaling

On Wed, Aug 31, 2016 at 2:01 AM, Justin Chang wrote: > Attached is the -log_view output (from firedrake). Event Stage 1: > Linear_solver is where I assemble and solve the linear system of equations. > > I am using the HYPRE BoomerAMG preconditioner so log_view cannot "see >

Re: [petsc-users] strong-scaling vs weak-scaling

Attached is the -log_view output (from firedrake). Event Stage 1: Linear_solver is where I assemble and solve the linear system of equations. I am using the HYPRE BoomerAMG preconditioner so log_view cannot "see into" the exact steps, but based on what it can see, how do I distinguish between

Re: [petsc-users] strong-scaling vs weak-scaling

Mark Adams writes: >> >> >> Anyway, what I really wanted to say is, it's good to know that these >> "dynamic range/performance spectrum/static scaling" plots are designed to >> go past the sweet spots. I also agree that it would be interesting to see a >> time vs

Re: [petsc-users] strong-scaling vs weak-scaling

> > > Anyway, what I really wanted to say is, it's good to know that these > "dynamic range/performance spectrum/static scaling" plots are designed to > go past the sweet spots. I also agree that it would be interesting to see a > time vs dofs*iterations/time plot. Would it then also be useful to

Re: [petsc-users] strong-scaling vs weak-scaling

Thanks everyone. I still think there is a even better phrase for this, like, static scaling? Because unlike strong/weak scaling, concurrency is fixed (hence "static") and we only scale the problem, so this is a mix between strong and weak scaling. ¯\_(ツ)_/¯ Anyway, what I really wanted to say

Re: [petsc-users] strong-scaling vs weak-scaling

Mark Adams writes: > I would guess it is the latter. In this case, definitely. > It is hard to get "rollover" to the right. You could get it on KNL > (cache configuration of HBM) when you spill out of HBM. Yes, but the same occurs if you start repeatedly spilling from some

Re: [petsc-users] strong-scaling vs weak-scaling

On Tue, Aug 23, 2016 at 4:33 AM, Justin Chang wrote: > Redid some of those experiments for 8 and 20 cores and scaled it up to > even larger problems. Attached is the plot. > > Looking at this "dynamic plot" (if you ask me, I honestly think there > could be a better word for

Re: [petsc-users] strong-scaling vs weak-scaling

Redid some of those experiments for 8 and 20 cores and scaled it up to even larger problems. Attached is the plot. Looking at this "dynamic plot" (if you ask me, I honestly think there could be a better word for this out there), the lines curve up for the smaller problems, have a "flat line" in

Re: [petsc-users] strong-scaling vs weak-scaling

Thanks all. So this issue was one of our ATPESC2015 exam questions, and turned some friends into foes. Most eventually fell into the strong-scale is harder camp, but some of these "friends" also believed PETSc is *not* capable of handling dense matrices and is not portable. Just wanted to hear

Re: [petsc-users] strong-scaling vs weak-scaling

Hi Justin, I have seen some people claim that strong-scaling is harder to achieve than weak scaling (e.g., https://www.sharcnet.ca/help/index.php/Measuring_Parallel_Scaling_Performance) and generally speaking it makes sense - communication overhead increases with concurrency. However, we know

Re: [petsc-users] strong-scaling vs weak-scaling

> > >> I have seen some people claim that strong-scaling is harder to achieve >> than weak scaling (e.g., https://www.sharcnet.ca >> /help/index.php/Measuring_Parallel_Scaling_Performance) and generally >> speaking it makes sense - communication overhead increases with concurrency. >> > I would

Re: [petsc-users] strong-scaling vs weak-scaling

On Sun, Aug 21, 2016 at 9:38 PM, Justin Chang wrote: > Hi all, > > This may or may not be a PETSc specific question but... > > I have seen some people claim that strong-scaling is harder to achieve > than weak scaling (e.g., https://www.sharcnet.ca/help/index.php/Measuring_

[petsc-users] strong-scaling vs weak-scaling

Hi all, This may or may not be a PETSc specific question but... I have seen some people claim that strong-scaling is harder to achieve than weak scaling (e.g., https://www.sharcnet.ca/help/index.php/Measuring_Parallel_Scaling_Performance) and generally speaking it makes sense - communication