Hi,

Loot at tutorial http://alps.comp-phys.org/mediawiki/index.php/ALPS_2_Tutorials:MC-01_Autocorrelations to understand critical slowing down. That is what seems to be happening. The required runtimes diverge with problem size close to a phase transition. 

You need to be careful in that regime, start at high T and small L, and slowly increase L or lower T once you are sure that your data has converged. 

Matthias

On Jan 22, 2019, at 11:57, Oskar Amadeusz Prośniak <oskar.krak@gmail.com> wrote:

Dear all,
while performing some simulations in BH model (DWA code), I encountered
problems with convergence in the vicinity of the critical point for
small temperature T and a large  linear dimension L.  What is the root
cause for the complexity of the simulation in such a case? I seem to get
a large systematic error (which looks non-random as a a function of
hamiltonian coupling constants). Is there any way to improve convergence?

While searching output hdf5 files for additional clues, and the DWA
documentation, I have encountered the error_convergence in output files.
Could I ask what exactly it is? Is it related to the "binning analysis"
which has been discussed throughout the alps website?

Is there is a build-in method for convergence analysis? that would be
very helpful.

Best regards,
Oskar A. Prośniak



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