Hrvoje Niksic <hniksic(a)iskon.hr&gt; writes: IIRC both our current collectors are older versions of the allocator that Doug Lea's allocator replaced in libg++/glibc. Using the Doug Lea version should normally be preferred I think.. Shouldn't we be using ralloc for frob blocks anyway? I don't know. My problem would be the fact that the triggering is based on allocation size.. What happens if you alloc+free - 1000, 1K strings - 1000, 1k buffers - 1 MB worth of cons cells. I am not sure either the current system or dlmalloc works in this case. Along the same lines I have been wondering whether the frobblock size shouldn't be upped? Jan