[igraph] Out of memory problem Kamadai Kawai layout

[Diederik van Liere]

Dear Tamas,

I am trying to visualize a network with about 21000 vertices and 17000 edges on 
a 4Gb macbook pro.
I get the following error message:

Python(31745) malloc: *** mmap(size=3614543872) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Traceback (most recent call last):
  File 
"/Users/diederik/Development/projectx/src/visualize_bugnetwork_igraph.py", line 
44, in <module>
   layout = g.layout_kamada_kawai()
igraph.core.InternalError: Error at ../../src/layout.c:548: , Out of memory

However, when I monitor memory usage in top, then I have still 1.6Gb free 
memory. So do you have any suggestions to address this issue?
Best regards,
Diederik