Dear Jochen, Thank you very much! This explains a lot... Actually we tried to run NEST simulation with mpi4py... Probably the problem is that our attempt was to assign it to only one of the processess. The interesting thing is that we run Simulate in all parallel process, it works. Best,Petia On Friday, January 15, 2021, 1:29:03 PM GMT+2, Jochen Martin Eppler &lt;j.eppler(a)fz-juelich.de&gt; wrote: Dear Petia, this looks a lot like you run out of working memory (RAM) on your machine. You can check the memory consumption by adding print('Memory before Simulate():', nest.ll_api.sli_func('memory_thisjob') right before your call Simulate(). The printed number is in kiB I am afraid that we can’t do much else for you here. Best regards, Jochen! On 15.01.21 11:07, Petia Koprinkova wrote: We have encountered the following error: Traceback (most recent call last): File "all_v2.py", line 364, in <module> nest.Simulate(sim_time) File "/opt/soft/nest-2.18.0/lib64/python3.6/site-packages/nest/ll_api.py", line 246, in stack_checker_func return f(*args, **kwargs) File "/opt/soft/nest-2.18.0/lib64/python3.6/site-packages/nest/lib/hl_api_simulation.py", line 66, in Simulate sr('ms Simulate') File "/opt/soft/nest-2.18.0/lib64/python3.6/site-packages/nest/ll_api.py", line 132, in catching_sli_run raise exceptionCls(commandname, message) nest.ll_api.C++Exception: ('C++Exception in Simulate_d: std::bad_alloc', 'C++Exception', <SLILiteral: Simulate_d>, ': std::bad_alloc') Could you help to resolve it? Best regards,Petia Koprinkova-Hristova _______________________________________________ NEST Users mailing list -- users(a)nest-simulator.org To unsubscribe send an email to users-leave(a)nest-simulator.org ​-- Dr. Jochen Martin Eppler Phone: +49(2461)61-96653 ---------------------------------- Simulation Laboratory Neuroscience Jülich Supercomputing Centre Institute for Advanced Simulation ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Volker Rieke Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ _______________________________________________ NEST Users mailing list -- users(a)nest-simulator.org To unsubscribe send an email to users-leave(a)nest-simulator.org