Search found 48 matches

by jackfolla
Thu Apr 10, 2014 3:41 am
Forum: Parallel NEURON
Topic: Parallel neural network (bad) performance
Replies: 2
Views: 6786

Re: Parallel neural network (bad) performance

Dear Ted,
thanks for the quick reply.

Regarding your question, the answer is the (1), I am one of the people who developed that model.

I'm sorry for my imprecision. ;)

Regarding the load imbalance, I will test the network with more neurons.
by jackfolla
Mon Apr 07, 2014 12:46 pm
Forum: Parallel NEURON
Topic: Parallel neural network (bad) performance
Replies: 2
Views: 6786

Parallel neural network (bad) performance

Hi all. I implemented (with other co-authors) the neural network model published on ModelDB ( http://senselab.med.yale.edu/ModelDB/ShowModel.asp?model=151126 ). We implemented a parallel version of this model. During performance tests, I observed some bad performance. In particular, I observed that ...
by jackfolla
Thu May 03, 2012 9:21 am
Forum: NEURON hacks
Topic: Use of crank.c file
Replies: 3
Views: 11010

Re: Use of crank.c file

Dear Ted,
thanks for your reply.

I'm interested to know how the Crank-Nicolson method (implemented in src/scopmath/crank.c) works in a NEURON model.

Can someone post me a model that certainly uses crank-nicolson (crank.c)?

Thanks.
by jackfolla
Fri Apr 27, 2012 4:28 am
Forum: NEURON hacks
Topic: Use of crank.c file
Replies: 3
Views: 11010

Use of crank.c file

Dear all, I would like to know the size of the tridiagonal matrix and other information from Crank-Nicolson solver (file crank.c in "src/scopmath"). I know that in general it is possible to specify in a mod file the method to use in order to solve a system of equations: i.e. for using euler method, ...
by jackfolla
Tue Dec 20, 2011 7:57 am
Forum: Modeling networks
Topic: How to change variable value at a specific time in hoc code
Replies: 2
Views: 3669

Re: How to change variable value at a specific time in hoc c

Hi.

I solved the problem with function Vector.play().

;)
by jackfolla
Tue Dec 20, 2011 6:33 am
Forum: Modeling networks
Topic: How to change variable value at a specific time in hoc code
Replies: 2
Views: 3669

How to change variable value at a specific time in hoc code

Hi all,
I have the following question.

I would change, in the hoc code, the value of a variable at a specific time (i.e. when t=100 ms) during the simulation.

It is possible? If it is possible, how can I do?

Thanks,
Pasquale.
by jackfolla
Tue Jun 07, 2011 1:55 pm
Forum: Parallel NEURON
Topic: Problem with synapses creation in MULTISPLIT
Replies: 2
Views: 1339

Re: Problem with synapses creation in MULTISPLIT

Dear Hines,
thanks for your help.
I sent you an email with the ref. to the forum thread.

In attach, I added the source code.

Thanks,
Pasquale.
by jackfolla
Mon Jun 06, 2011 11:28 am
Forum: Parallel NEURON
Topic: Problem with synapses creation in MULTISPLIT
Replies: 2
Views: 1339

Problem with synapses creation in MULTISPLIT

Dear all, I'm trying to solve a problem with the synapses creation in a MULTISPLIT simulation. My problem is the following: I have 2 procedures for synapses creation, which are: proc create_syn_NMDA() { local i localobj tobj for i = 0, $1-1 { tobj = new Exp2Syn(0.5) tobj.tau1=1 tobj.tau2=10 tobj.e=0...
by jackfolla
Wed Mar 16, 2011 1:35 pm
Forum: Parallel NEURON
Topic: nrn_timeout error
Replies: 2
Views: 1988

nrn_timeout error

Dear all, during my runs I have the nrn_timeout error. nrn_timeout t=6525.15 [gozer3:21108] MPI_ABORT invoked on rank 0 in communicator MPI_COMM_WORLD with errorcode 0 mpiexec noticed that job rank 1 with PID 21109 on node gozer3 exited on signal 15 (Terminated). 6 additional processes aborted (not ...
by jackfolla
Thu Feb 24, 2011 7:59 pm
Forum: Adding new mechanisms and functions to NEURON
Topic: Access NMODL vars from HOC
Replies: 1
Views: 1163

Access NMODL vars from HOC

Hi all, I want to access to the vars declared in a file.mod. My file.mod is: NEURON { SUFFIX STDPE2 POINT_PROCESS STDPE2 RANGE tau1, tau2, e, i, d, p, dtau, ptau, thresh, wmax, wmin RANGE g, gbdel, gblen, gbint, gscale NONSPECIFIC_CURRENT i } .................. In my file.hoc I want to print a varia...
by jackfolla
Mon Feb 14, 2011 4:43 pm
Forum: Parallel NEURON
Topic: "point process not located in a section" with multisplit
Replies: 12
Views: 5119

Re: "point process not located in a section" with multisplit

Dear hines, maybe I forgot to tell you that when I call stimul_syn(), I use "if (section_exists("soma", 0)) stimul_syn($2,$1)". Calling stimul_syn() without the "if (section_exists("soma", 0))", this is the output. 0 located 0 NMDA[0] apical_dendrite[64](0.5) 0 located 1 NMDA[1] apical_dendrite[64](...
by jackfolla
Mon Feb 14, 2011 3:49 pm
Forum: Parallel NEURON
Topic: "point process not located in a section" with multisplit
Replies: 12
Views: 5119

Re: "point process not located in a section" with multisplit

hines wrote:So there are no synapes on rank 0?
Yes. With 2 hosts there are no synapses on rank 0.
by jackfolla
Mon Feb 14, 2011 2:53 pm
Forum: Parallel NEURON
Topic: "point process not located in a section" with multisplit
Replies: 12
Views: 5119

Re: "point process not located in a section" with multisplit

Dear hines, following your instructions, now the output is: 1 located 0 NMDA[0] dendrite[47](0.5) 1 located 1 NMDA[1] dendrite[52](0.75) 1 located 2 NMDA[2] dendrite[45](0.5) 1 located 3 NMDA[3] dendrite[44](0.5) 1 located 4 NMDA[4] dendrite[39](0.5) 1 located 5 NMDA[5] dendrite[15](0.833333) 1 loca...
by jackfolla
Mon Feb 14, 2011 11:39 am
Forum: Parallel NEURON
Topic: "point process not located in a section" with multisplit
Replies: 12
Views: 5119

Re: "point process not located in a section" with multisplit

This is the output: 1 located 0 NMDA[0] soma[0] 1 located 1 NMDA[1] soma[0] 1 located 2 NMDA[2] soma[0] 1 located 3 NMDA[3] soma[0] 1 located 4 NMDA[4] soma[0] 1 located 5 NMDA[5] soma[0] 1 located 6 NMDA[6] soma[0] 1 located 7 NMDA[7] soma[0] 1 located 8 NMDA[8] soma[0] 1 located 9 NMDA[9] soma[0] ...
by jackfolla
Mon Feb 14, 2011 11:19 am
Forum: Parallel NEURON
Topic: "point process not located in a section" with multisplit
Replies: 12
Views: 5119

Re: "point process not located in a section" with multisplit

Dear hines, with mpiexec -np 1 ... the clause else does not print anything. With mpiexec -np 2 ... the clause else prints the following: NMDA[76] soma[0] NMDA[78] soma[0] NMDA[79] soma[0] NMDA[82] soma[0] NMDA[83] soma[0] NMDA[90] soma[0] NMDA[91] soma[0] NMDA[92] soma[0] NMDA[93] soma[0] NMDA[94] s...