Auryn simulator

Simulator for spiking neural networks with synaptic plasticity

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manual:known_issues

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manual:known_issues [2016/09/01 09:13] (current)
zenke created
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 +====== Known Issues ======
 + 
  
 +  * Spike-loss and random crashes experienced with with process numbers that were not a power of two. (OpenMPI 1.4.3)
 +  * Random communication freezes for large messages (i.e. caused by synchronization in the network -> many spikes in short time intervals). ​ (OpenMPI 1.5.4)
 +  * Still getting random freezes when running v0.8.0-beta on Ubuntu 14.04 LTS with the stock openmpi (Open MPI 1.6.5) ​
 +
 +I traced the freezes to SyncBuffer at high firing rates or high synchrony. In most cases it seems as if some processes do not recover from MPI_Allgather when resending the buffer after an overflow. To reproduce run
 +
 +<​code>​
 +mpirun -n 4 ./​sim_background --dir /tmp --wee 0.17
 +</​code>​
 +
 +or for instance
 +
 +<​code>​
 +mpirun -n 4 ./​sim_poisson --kappa 20000
 +</​code>​
 +
 +Note, that -n 2 seems to work and 3 or 5 cause other weird problems. Looks like a bug in openmpi.
 +When compiled against MPICH these problems do not occur.
manual/known_issues.txt ยท Last modified: 2016/09/01 09:13 by zenke