if( remote >= size ) remote -= size;
if (childs==MAXTREEFANOUT) {
XBT_DEBUG("coll:tuned:topo:build_bmtree max fanout incorrect %d needed %d", MAXTREEFANOUT, childs);
if( remote >= size ) remote -= size;
if (childs==MAXTREEFANOUT) {
XBT_DEBUG("coll:tuned:topo:build_bmtree max fanout incorrect %d needed %d", MAXTREEFANOUT, childs);