Hi!

Just a brief update: The macOS build instructions are at https://nest-simulator.readthedocs.io/en/stable/installation/install_options.html#compiling-for-apple-osx-macos

Best,

Hans Ekkehard

On 27 Mar 2020, at 15:06, Hans Ekkehard Plesser <hans.ekkehard.plesser@nmbu.no> wrote:

Hi Josh,

I am able to reproduce the problem when I install NEST via conda onder macOS 10.14 and 10.15, while all works well with NEST 2.20.0 if I build it from scratch on my computer. Obviously, this should not happen. Could you create a bug report on the NEST Github page (https://github.com/nest/nest-simulator/issues/new?assignees=&labels=&template=bug_report.md&title=)?

As work-arounds for now, you could use the dockered version of NEST (https://nest-simulator.readthedocs.io/en/stable/installation/index.html#standard-installation-instructions) or build NEST yourself. Unfortunately, it seems that our build instructions for NEST on Mac are currently missing, I will check that asap.

Best,

Hans Ekkehard

On 26 Mar 2020, at 17:07, Joshua Stern <sternj@college.harvard.edu> wrote:

Thank you for your reply Hans! 

I am using Nest-2.20.0 installed with Conda on Mac os 10.14 Mojave. I have just tried removing the environment and reinstalling using Conda again, but ran into the same issue. What should I do to troubleshoot this? 

Thank you so much and best wishes,

Josh

On Thu, Mar 26, 2020 at 2:52 AM Hans Ekkehard Plesser <hans.ekkehard.plesser@nmbu.no> wrote:

Hi Josh,

Thanks for your report! This does not look like a memory issue but may point to some internal inconsistency in NEST.

A few questions:

- Which version of NEST are you using?

- How did you install NEST (looks like you used conda)?

- Which operating system are you using?

Best,

Hans Ekkehard

On 25 Mar 2020, at 18:29, sternj@college.harvard.edu wrote:

Hello all,

Hope everyone is staying safe and well in these difficult times.

I am an undergrad who is just getting started with this library, so I want to apologize in advance for the basic question. I am having issues I believe are memory-related when I call GetConnections on rather small networks. Here is my script:

import nest
# memory testing
nest.ResetKernel()
n = 5 # number of neurons
epop1 = nest.Create("iaf_psc_alpha",n)
epop2 = nest.Create("iaf_psc_alpha",n)
nest.Connect(epop1,epop2,{'rule': 'all_to_all'})

# we can now query the synapses using GetConnections
conns = nest.GetConnections(epop1,target = epop2)
nest.GetStatus(conns,["target","weight"])

This runs fine for n < 5, but I get the following error with n >=5:

Assertion failed: (source_lid < MAX_LID), function set_source_lid, file /usr/local/miniconda/conda-bld/nest-simulator_1583214474797/work/nestkernel/target_data.h, line 264.
Abort trap: 6

I have run some of the example scripts like brunel_alpha_numpy with a few thousand neurons and they work just fine.

Am I making an improper call to GetConnections here? And if so, what is a better way to dynamically check connectivity?
Alternatively, might there be something wrong with my Nest environment? And if so, what should I look at to troubleshoot this?

Thank you so much for your help.

Best wishes,
Josh
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--

Prof. Dr. Hans Ekkehard Plesser

Head, Data Science Section

Faculty of Science and Technology

Norwegian University of Life Sciences
PO Box 5003, 1432 Aas, Norway

Phone +47 6723 1560
Email hans.ekkehard.plesser@nmbu.no
Home  http://arken.nmbu.no/~plesser

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To unsubscribe send an email to users-leave@nest-simulator.org

_______________________________________________
NEST Users mailing list -- users@nest-simulator.org
To unsubscribe send an email to users-leave@nest-simulator.org

--

Prof. Dr. Hans Ekkehard Plesser

Head, Data Science Section

Faculty of Science and Technology

Norwegian University of Life Sciences
PO Box 5003, 1432 Aas, Norway

Phone +47 6723 1560
Email hans.ekkehard.plesser@nmbu.no
Home  http://arken.nmbu.no/~plesser

_______________________________________________
NEST Users mailing list -- users@nest-simulator.org
To unsubscribe send an email to users-leave@nest-simulator.org

--

Prof. Dr. Hans Ekkehard Plesser

Head, Data Science Section

Faculty of Science and Technology

Norwegian University of Life Sciences
PO Box 5003, 1432 Aas, Norway

Phone +47 6723 1560
Email hans.ekkehard.plesser@nmbu.no
Home  http://arken.nmbu.no/~plesser

_______________________________________________
NEST Users mailing list -- users@nest-simulator.org
To unsubscribe send an email to users-leave@nest-simulator.org