Determinism is an unusual feature of the Sieve System. If executing a parallel Sieve program on a multi core machine yields a bug, the bug will not disappear when ranrun on a single core to aid [[debugging]][http://www.codeplay.com/downloads_public/sievepaper-2columns-normal.pdf][http://www.cl.cam.ac.uk/~al407/research/papers/eupar07.pdf]. This has the advantage of eliminating [[race conditions]], one of the most common bugs in [[concurrent programming]]. The removal of the need to consider [[concurrency control]] structures within a sieve block can speed up development time and results in safer code.
