id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
4960	boost::pool_allocator for vector of vectors exhausts memory	mattiasg	Chris Newbold	"glr9940 reported in #386 that using boost::pool_allocator for a vector of vectors caused problems. I have now found a slight extension to the example glr9940 reported which does not crash, but exhausts memory even for a tiny vector of vectors.

I have used the development trunk code and gcc 4.1.2. 

{{{#!cpp
#include <boost/pool/pool_alloc.hpp>
#include <vector>
#include <iostream>

typedef std::vector<int, boost::pool_allocator<int> > EventVector;
typedef std::vector<EventVector> IndexVector;

int main() 
{
  IndexVector iv;
  int limit = 100;
  for (int i = 0; i < limit; ++i) 
    iv.push_back(EventVector());

  std::cout << ""it works\n"";
  return 0;
}
}}}

I suspect that the critical value for 'limit' depends on the machine. On my machine a limit of 20 seems to work fine, a limit of 24 uses a few Gb of memory, while a limit of 30 stalls the process, 'top' showing that the memory footprint doubles rapidly until memory is exhausted. I've noticed for other examples of this issue that when I replace the vector push_back loop with a rolled out version just creating a number of pooled vectors, it works fine.

Have I made some noob mistake, or is this a bug?"	Bugs	closed	To Be Determined	pool	Boost Development Trunk	Problem	fixed		boostpool@…