OSError: cannot load library 'libngspice.so'

tamenol commented 6 years ago

Environment (OS, Python version, PySpice version, simulator)

Linux Ubuntu 16.04 Python 3.5 PySpice 1.1.4

Expected Behaviour

Running

import PySpice.Logging.Logging as Logging
logger = Logging.setup_logging()

from PySpice.Spice.NgSpice.Shared import NgSpiceShared

ngspice = NgSpiceShared.new_instance()

print(ngspice.exec_command('version -f'))
print(ngspice.exec_command('print all'))
print(ngspice.exec_command('devhelp resistor'))

without erros.

Actual Behaviour

(venv) speklap:thesis_pcb$ python -i run.py

2018-06-01 15:02:01,206 - PySpice.Spice.NgSpice.Shared.NgSpiceShared.new_instance - INFO - New instance for id 0 Traceback (most recent call last): File "run.py", line 6, in ngspice = NgSpiceShared.new_instance() File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/PySpice/Spice/NgSpice/Shared.py", line 338, in new_instance instance = cls(ngspice_id=ngspice_id, send_data=send_data) File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/PySpice/Spice/NgSpice/Shared.py", line 356, in init self._load_library() File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/PySpice/Spice/NgSpice/Shared.py", line 381, in _load_library self._ngspice_shared = ffi.dlopen(library_path) File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/cffi/api.py", line 141, in dlopen lib, function_cache = _make_ffi_library(self, name, flags) File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/cffi/api.py", line 802, in _make_ffi_library backendlib = _load_backend_lib(backend, libname, flags) File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/cffi/api.py", line 797, in _load_backend_lib raise OSError(msg) OSError: cannot load library 'libngspice.so': libngspice.so: cannot open shared object file: No such file or directory. Additionally, ctypes.util.find_library() did not manage to locate a library called 'libngspice.so'

Steps to reproduce the behaviour

I've install pyspice using pip in a virtual environment. ngspice I tried installing through apt-get and through tarball. I can open the ngspice 'console' and use it to simulate but can't use it with python.

I can't locate libngspice.so on my system, also my $LD_LIBRARY_PATH shows up empty.

How can I fix this? Thanks

FabriceSalvaire commented 6 years ago

can you confirm on version 1.2 ?

tamenol commented 6 years ago

I've reinstalled it using $ pip install git+https://github.com/FabriceSalvaire/PySpice

2018-06-07 18:10:33,939 - PySpice.Spice.NgSpice.Shared.NgSpiceShared.new_instance - INFO - New instance for id 0 2018-06-07 18:10:33,967 - PySpice.Spice.NgSpice.Shared.NgSpiceShared._load_library - DEBUG - Load libngspice.so Traceback (most recent call last): File "run.py", line 6, in ngspice = NgSpiceShared.new_instance() File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/PySpice/Spice/NgSpice/Shared.py", line 331, in new_instance instance = cls(ngspice_id=ngspice_id, send_data=send_data) File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/PySpice/Spice/NgSpice/Shared.py", line 349, in init self._load_library() File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/PySpice/Spice/NgSpice/Shared.py", line 375, in _load_library self._ngspice_shared = ffi.dlopen(library_path) File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/cffi/api.py", line 141, in dlopen lib, function_cache = _make_ffi_library(self, name, flags) File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/cffi/api.py", line 802, in _make_ffi_library backendlib = _load_backend_lib(backend, libname, flags) File "/home/speklap/Projects/InProgress/thesis_pcb/venv/lib/python3.5/site-packages/cffi/api.py", line 797, in _load_backend_lib raise OSError(msg) OSError: cannot load library 'libngspice.so': libngspice.so: cannot open shared object file: No such file or directory. Additionally, ctypes.util.find_library() did not manage to locate a library called 'libngs pice.so'

$LD_LIBRARY_PATH is still empty. Do I need to insert some path to $LD_LIBRARY_PATH?

FabriceSalvaire commented 6 years ago

what is the path of libngspice.so on your env ?

tamenol commented 6 years ago

I had installed ngspice using apt-get. I couldn't find the library myself as well. I purged it and tried installing through git with the correct configure option to create the shared library. I haven't got it installed properly yet this way. Something is still broken on my system it seems. Will report back once I got ngspice working.

FabriceSalvaire commented 6 years ago

You have to check the shared library is provided in the package, some linux distributions don't include it.

peteut commented 4 years ago

Hitting the same error, using Debian buster. The filename is libngspice.so.0 in this case.

$ sudo ldconfig -p | grep libngspice.so
        libngspice.so.0 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libngspice.so.0

peteut commented 4 years ago

ctyles.util.find_library should probably be used here:

from ctypes.util import find_library

ngspice_lib_filename = find_library('ngspice')

oe1rsa commented 4 years ago

sudo apt-get libngspice0-dev

tadeussilver commented 4 years ago

I have a similar error when trying to simulate this example https://pyspice.fabrice-salvaire.fr/examples/filter/low-pass-rc-filter.html I get the following error `2020-05-25 00:55:20,166 - PySpice.Spice.NgSpice.Shared.NgSpiceShared.new_instance - INFO - New instance for id 0 2020-05-25 00:55:20,166 - PySpice.Spice.NgSpice.Shared.NgSpiceShared._load_library - WARNING - Set locale LC_NUMERIC to C

OSError Traceback (most recent call last)

in () ----> 1 simulator = circuit.simulator(temperature=25, nominal_temperature=25) 2 analysis = simulator.ac(start_frequency=1@u_Hz, stop_frequency=1@u_MHz, number_of_points=10, variation='dec') 8 frames /usr/local/lib/python3.6/dist-packages/cffi/api.py in _load_backend_lib(backend, name, flags) 825 if first_error is not None: 826 msg = "%s. Additionally, %s" % (first_error, msg) --> 827 raise OSError(msg) 828 return backend.load_library(path, flags) 829 OSError: cannot load library 'libngspice.so': libngspice.so: cannot open shared object file: No such file or directory. Additionally, ctypes.util.find_library() did not manage to locate a library called 'libngspice.so' ` when trying to install libngspice0 library I get another error `Processing triggers for libc-bin (2.27-3ubuntu1) ... /sbin/ldconfig.real: /usr/local/lib/python3.6/dist-packages/ideep4py/lib/libmkldnn.so.0 is not a symbolic link Errors were encountered while processing: libngspice0:amd64` I have already tried many things, almost none of them works, I am not very good at programming, among other things, I really need the module to work in the circuit simulation because I do not have multisim due to the economic resources, therefore if anyone has any solution I am grateful. my system details are as follows ubuntu 18.04, python 3.6.2, pyspice 1.4.2

tamenol commented 4 years ago

Yeah I'm sorry. This is too long ago for me and I don't know anymore what I did.

tadeussilver commented 4 years ago

help, I already investigated a lot without result, do you know a better alternative than pyscpice?

FabriceSalvaire commented 4 years ago

@tadeussilver I pushed an updated installation documentation

https://pyspice.fabrice-salvaire.fr/releases/v1.4/installation.html#on-linux

tell me if it help you

tadeussilver commented 4 years ago

@FabriceSalvaire honestly the situation was overcome for the moment, I explain what I was trying to do due to the pandemic I cannot access the computers of the institute and due to my economic situation I cannot access a good range computer, however I try to carry out my university work efficient however complex circuit simulations do not work for me so look for an alternative called google colab. If you manage to implement it in Google collaborated effectively, I would like you to let me know and I will try this week, however some modules fail when trying. If you want to know more about Google, I leave the info here. https://colab.research.google.com/notebooks/welcome.ipynb

raghuttamh commented 3 years ago

Even I am facing the same problem and It would be great to see it rectified soon

sljunkie commented 3 years ago

@tadeussilver I was wondering if I could use PySpice in a Google Colab environment as a educational tool @ uni. So I read its Importing libraries snipped. I could install the PySpice module with

!pip install PySpice

but colab's server (Ubuntu-based?) couldn't find libngspice / libngspice-dev /libngspice0 / libngpice0-dev:

!apt-get -qq install -y libngspice0-dev E: Unable to locate package libngspice0-dev

And that's a shame, really - looks like that package is only available on Ubuntu from 20.04LTS onwards. Can anyone using Ubuntu confirm this?

cyber-g commented 3 years ago

Please have a look to the following discourse thread :

Installation example scripts https://pyspice.discourse.group/t/installation-example-scripts/117

The Dockerfiles demonstrate how to "manually" install the precompiled library distributed on standard deb repo. The precompiled libraries are only available for :

Ubuntu Focal (20.04) and newer : https://packages.ubuntu.com/search?keywords=libngspice0-dev&searchon=names&suite=all&section=all
Debian Stretch (9) (using the backports) and newer : https://packages.debian.org/search?suite=all&searchon=names&keywords=libngspice0-dev

If you cannot instantiate a system with those OS version, you must install the library by building it from source.

raghuttamh commented 3 years ago

I am using Ubuntu 20.04 and doesn't seem to work in it. I have seen it working on Arch based linux, Manjaro and it was pretty smooth and easy there

simonwaid commented 2 years ago

I had a similar issue. Updating cffi to the newest version (1.5) solved it for me.

Varat7v2 commented 2 years ago

@tadeussilver I was wondering if I could use PySpice in a Google Colab environment as a educational tool @ uni. So I read its Importing libraries snipped. I could install the PySpice module with

!pip install PySpice

but colab's server (Ubuntu-based?) couldn't find libngspice / libngspice-dev /libngspice0 / libngpice0-dev:

!apt-get -qq install -y libngspice0-dev E: Unable to locate package libngspice0-dev

And that's a shame, really - looks like that package is only available on Ubuntu from 20.04LTS onwards. Can anyone using Ubuntu confirm this?

Hi @tadeussilver! Even I am having the same issue on Google Colab. Did you find any solution for Google Colab?

cyber-g commented 2 years ago

You have to install the library manually on Google Colab (the version ubuntu on it is too old). Please use the following commands in your Google Colab notebooks :

# libngspice0 (from stretch-backports) depends on libc6 which is missing by default
# pre-install dependency
!apt update && apt -q install libc6-dev 
# Download from debian and install library
!wget http://ftp.fr.debian.org/debian/pool/main/n/ngspice/libngspice0_30.2-1~bpo9+1_amd64.deb && apt install -q ./libngspice0_30.2-1~bpo9+1_amd64.deb
!wget http://ftp.fr.debian.org/debian/pool/main/n/ngspice/libngspice0-dev_30.2-1~bpo9+1_amd64.deb && apt install -q ./libngspice0-dev_30.2-1~bpo9+1_amd64.deb
# Install PySpice
!pip3 install PySpice

Then it should work. (you can change the server ftp.fr.debian.org to a closer one to you) Let me know if it does not.

Varat7v2 commented 2 years ago

@cyber-g, Hi! I followed your instructions, and it solved this problem: Unable to locate package libngspice0-dev. But I am getting the following error.

2022-06-01 21:57:50,787 - PySpice.Spice.NgSpice.Shared.NgSpiceShared._send_char - WARNING - spinit was not found
2022-06-01 21:57:50,787 - PySpice.Spice.NgSpice.Shared.NgSpiceShared._send_char - ERROR - Note: can't find init file.
2022-06-01 21:57:50,795 - PySpice.Spice.NgSpice.Shared.NgSpiceShared._send_char - ERROR - Warning - approaching max data size: current size = 13392.891 MB, limit = 2214.602 MB
Traceback (most recent call last):
  File "PEDApp_main.py", line 218, in <module>
    circuit, analysis = pyspice.simulate_ckt(netlist_dict)
  File "/content/drive/MyDrive/Colab Notebooks/PROJECT-ECD-main/myPySPICE_master.py", line 318, in simulate_ckt
    simulator = circuit.simulator(temperature=25, nominal_temperature=25)
  File "/usr/local/lib/python3.7/dist-packages/PySpice/Spice/Netlist.py", line 1292, in simulator
    return CircuitSimulator.factory(self, *args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/PySpice/Spice/Simulation.py", line 1167, in factory
    return sub_cls(circuit, *args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/PySpice/Spice/NgSpice/Simulation.py", line 99, in __init__
    self._ngspice_shared = NgSpiceShared.new_instance()
  File "/usr/local/lib/python3.7/dist-packages/PySpice/Spice/NgSpice/Shared.py", line 449, in new_instance
    instance = cls(ngspice_id=ngspice_id, send_data=send_data, verbose=verbose)
  File "/usr/local/lib/python3.7/dist-packages/PySpice/Spice/NgSpice/Shared.py", line 480, in __init__
    self._init_ngspice(send_data)
  File "/usr/local/lib/python3.7/dist-packages/PySpice/Spice/NgSpice/Shared.py", line 586, in _init_ngspice
    self._get_version()
  File "/usr/local/lib/python3.7/dist-packages/PySpice/Spice/NgSpice/Shared.py", line 867, in _get_version
    output = self.exec_command('version -f')
  File "/usr/local/lib/python3.7/dist-packages/PySpice/Spice/NgSpice/Shared.py", line 851, in exec_command
    raise NgSpiceCommandError("Command '{}' failed".format(command))
PySpice.Spice.NgSpice.Shared.NgSpiceCommandError: Command 'version -f' failed

Thank you in advance for your help.

cyber-g commented 2 years ago

The error message is similar to https://github.com/conda-forge/pyspice-feedstock/issues/18 It looks like the installation of the library is not installing all the configuration files for ngspice. To solve that, ngspice must be also installed ( with apt).

Please find the updated preliminary commands. (note ngspice has been added to the first apt install)

# libngspice0 (from stretch-backports) depends on libc6 which is missing by default
# pre-install dependency
!apt update && apt -q install libc6-dev ngspice
# Download from debian and install library
!wget http://ftp.fr.debian.org/debian/pool/main/n/ngspice/libngspice0_30.2-1~bpo9+1_amd64.deb && apt install -q ./libngspice0_30.2-1~bpo9+1_amd64.deb
!wget http://ftp.fr.debian.org/debian/pool/main/n/ngspice/libngspice0-dev_30.2-1~bpo9+1_amd64.deb && apt install -q ./libngspice0-dev_30.2-1~bpo9+1_amd64.deb
# Install PySpice
!pip3 install PySpice

I used Simulation using External Sources as a test example using shared ngspice since I cannot run your code. The simulation on Google Colab works without any warning or error for that example.

PySpice-org / PySpice