I am currently running 3 instances of CosmoMC with the following .ini configuration:
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#general settings #Bicep-Keck-Planck, varying cosmological parameters DEFAULT(batch2/BKPlanck.ini) #general settings DEFAULT(batch2/common.ini) #e.g. to vary r in addition to standard 6: #(for r>0 also need compute_tensors=T) compute_tensors = T param[r] = 0.03 0 2 0.04 0.04 param[tau] = 0.07 #high for new runs MPI_Max_R_ProposeUpdate = 30 propose_matrix= planck_covmats/base_TT_lowTEB_plik.covmat #Folder where files (chains, checkpoints, etc.) are stored root_dir = chains/TEST/ #Root name for files produced file_root=test1 #action= 0 runs chains, 1 importance samples, 2 minimizes #use action=4 just to quickly test likelihoods action = 0 #expected result for -(log like) test_check_compare = 28.337 num_threads = 0 #if you want to get theory cl for test point #test_output_root = output_cl_root [b] start_at_bestfit =F #T[/b] feedback=2 use_fast_slow = T checkpoint = T stop_on_error=F #sampling_method=7 is a new fast-slow scheme good for Planck sampling_method = 7 dragging_steps = 3 propose_scale = 2 #Set >0 to make data files for importance sampling indep_sample=0 #these are just small speedups for testing get_sigma8=T #Uncomment this if you dont want one 0.06eV neutrino by default #num_massive_neutrinos= #to vary parameters set param[name]= center, min, max, start width, propose width #param[mnu] = 0 0 0 0 0
2 runs on CosmoMC-master - one that starts at best fit and one that doesn't.
and 1 run on CosmoMC-Nov2016 that doesn't start at best fit.
All of these runs, at this point are running for over a week. And some for more.
The 2 runs that don't start at best fit show convergence statistics, at the level of ~0.2
All previous tests (i.e. test.ini, test_planck.ini) were successful.
Any idea what might be going wrong?
It seems as maybe there is some noise that prevents the MC from settling into the minimum point of the underlying data's phase space.
Also I have hunch it might have to do with the optical depth?