That depends - if your code is mostly single threaded, and you're using the concmarksweep collector on a multicore CPU, determinign which objects are live is ba

That depends - if your code is mostly single threaded, and you're using the concmarksweep collector on a multicore CPU, determinign which objects are live is basically 'free'. On machines with a high number of cores, have all cores on 100% is very rare.