# efficieny of mThreadedMergeSort

query setcore(5);
#(79.65sec) /86.49sec = 0.920915
#n 24.3001sec / 64.95sec = 0.374136
query buildings feed  mThreadedMergeSort[Osm_id] {memory 1} count;

#(104.498sec) /103.31sec = 1.0115
#n 25.3076sec / 72.15sec = 0.350763
query buildings feed  mThreadedMergeSort[Osm_id] {memory 2} count;

#(98.0034sec) /100.1sec = 0.979055
#22.6354sec / 66.55sec = 0.340126
query buildings feed  mThreadedMergeSort[Osm_id] {memory 5} count;

# (103.908sec) /103.64sec = 1.00259
#n21.7977sec / 63.13sec = 0.345283
query buildings feed  mThreadedMergeSort[Osm_id] {memory 10} count;

#(114.966sec) /116.27sec = 0.988783
#n24.1524sec / 70.11sec = 0.344493
query buildings feed  mThreadedMergeSort[Osm_id] {memory 20} count;

#59.9045sec / 55.59sec = 1.07761
#n 22.5622sec / 51.72sec = 0.436237
query buildings feed  mThreadedMergeSort[Osm_id] count;


#sortby: 9.76582sec / 9.76sec = 1.0006
#core 3: 22.6931sec / 29.07sec = 0.780638