Polymorphic MapReduce!
This commit is contained in:
Eric Holk
parent
5c0cc474be
commit
640886ceb6
@ -26,6 +26,7 @@ fn mode_str(m: &ty::mode) -> str {
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mo_val. { "" }
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mo_alias(false) { "&" }
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mo_alias(true) { "&mutable " }
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mo_move. { "-" }
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}
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}
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328
src/test/bench/task-perf-word-count-generic.rs
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328
src/test/bench/task-perf-word-count-generic.rs
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@ -0,0 +1,328 @@
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/**
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A parallel word-frequency counting program.
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This is meant primarily to demonstrate Rust's MapReduce framework.
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It takes a list of files on the command line and outputs a list of
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words along with how many times each word is used.
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*/
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use std;
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import option = std::option::t;
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import std::option::some;
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import std::option::none;
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import std::str;
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import std::treemap;
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import std::vec;
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import std::io;
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import std::time;
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import std::u64;
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import std::task;
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import std::task::joinable_task;
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import std::comm;
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import std::comm::chan;
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import std::comm::port;
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import std::comm::recv;
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import std::comm::send;
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fn map(filename: &[u8], emit: &map_reduce::putter<[u8], int>) {
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let f = io::file_reader(str::unsafe_from_bytes(filename));
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while true {
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alt read_word(f) {
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some(w) { emit(str::bytes(w), 1); }
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none. { break; }
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}
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}
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}
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fn reduce(word: &[u8], get: &map_reduce::getter<int>) {
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let count = 0;
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while true { alt get() { some(_) { count += 1; } none. { break } } }
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}
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mod map_reduce {
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export putter;
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export getter;
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export mapper;
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export reducer;
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export map_reduce;
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type putter<~K, ~V> = fn(&K, &V);
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// FIXME: the first K1 parameter should probably be a -, but that
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// doesn't parse at the moment.
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type mapper<~K1, ~K2, ~V> = fn(&K1, &putter<K2, V>);
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type getter<~V> = fn() -> option<V>;
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type reducer<~K, ~V> = fn(&K, &getter<V>);
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tag ctrl_proto<~K, ~V> {
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find_reducer(K, chan<chan<reduce_proto<V>>>);
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mapper_done;
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}
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tag reduce_proto<~V> { emit_val(V); done; ref; release; }
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fn start_mappers<~K1, ~K2, ~V>(map : mapper<K1, K2, V>,
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ctrl: chan<ctrl_proto<K2, V>>, inputs: &[K1])
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-> [joinable_task] {
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let tasks = [];
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for i in inputs {
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let m = map, c = ctrl, ii = i;
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tasks += [task::spawn_joinable(bind map_task(m, c, ii))];
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}
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ret tasks;
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}
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fn map_task<~K1, ~K2, ~V>(map : -mapper<K1,K2,V>,
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ctrl: -chan<ctrl_proto<K2,V>>, input: -K1) {
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// log_err "map_task " + input;
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let intermediates = treemap::init();
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fn emit<~K2, ~V>(im: &treemap::treemap<K2, chan<reduce_proto<V>>>,
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ctrl: &chan<ctrl_proto<K2,V>>, key: &K2, val: &V) {
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let c;
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alt treemap::find(im, key) {
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some(_c) {
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c = _c
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}
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none. {
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let p = port();
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send(ctrl, find_reducer(key, chan(p)));
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c = recv(p);
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treemap::insert(im, key, c);
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send(c, ref);
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}
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}
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send(c, emit_val(val));
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}
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map(input, bind emit(intermediates, ctrl, _, _));
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fn finish<~K, ~V>(k : &K, v : &chan<reduce_proto<V>>) {
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send(v, release);
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}
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treemap::traverse(intermediates, finish);
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send(ctrl, mapper_done);
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}
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fn reduce_task<~K, ~V>(reduce : -reducer<K,V>,
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key: -K, out: -chan<chan<reduce_proto<V>>>) {
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let p = port();
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send(out, chan(p));
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let ref_count = 0;
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let is_done = false;
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fn get<~V>(p: &port<reduce_proto<V>>, ref_count: &mutable int,
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is_done: &mutable bool) -> option<V> {
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while !is_done || ref_count > 0 {
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alt recv(p) {
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emit_val(v) {
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// log_err #fmt("received %d", v);
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ret some(v);
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}
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done. {
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// log_err "all done";
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is_done = true;
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}
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ref. { ref_count += 1; }
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release. { ref_count -= 1; }
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}
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}
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ret none;
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}
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reduce(key, bind get(p, ref_count, is_done));
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}
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fn map_reduce<~K1, ~K2, ~V>(map : mapper<K1,K2,V>,
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reduce : reducer<K2, V>,
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inputs: &[K1]) {
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let ctrl = port();
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// This task becomes the master control task. It task::_spawns
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// to do the rest.
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let reducers = treemap::init();
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let tasks = start_mappers(map, chan(ctrl), inputs);
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let num_mappers = vec::len(inputs) as int;
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while num_mappers > 0 {
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alt recv(ctrl) {
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mapper_done. {
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// log_err "received mapper terminated.";
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num_mappers -= 1;
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}
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find_reducer(k, cc) {
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let c;
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// log_err "finding reducer for " + k;
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alt treemap::find(reducers, k) {
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some(_c) {
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// log_err "reusing existing reducer for " + k;
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c = _c;
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}
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none. {
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// log_err "creating new reducer for " + k;
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let p = port();
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let r = reduce, kk = k;
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tasks +=
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[task::spawn_joinable(bind reduce_task(r,
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kk, chan(p)))];
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c = recv(p);
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treemap::insert(reducers, k, c);
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}
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}
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send(cc, c);
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}
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}
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}
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fn finish<~K, ~V>(k : &K, v : &chan<reduce_proto<V>>) {
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send(v, done);
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}
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treemap::traverse(reducers, finish);
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for t in tasks { task::join(t); }
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}
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}
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fn main(argv: [str]) {
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if vec::len(argv) < 2u {
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let out = io::stdout();
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out.write_line(#fmt["Usage: %s <filename> ...", argv[0]]);
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// TODO: run something just to make sure the code hasn't
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// broken yet. This is the unit test mode of this program.
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ret;
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}
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let iargs = [];
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for a in vec::slice(argv, 1u, vec::len(argv)) {
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iargs += [str::bytes(a)];
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}
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// We can get by with 8k stacks, and we'll probably exhaust our
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// address space otherwise.
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task::set_min_stack(8192u);
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let start = time::precise_time_ns();
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map_reduce::map_reduce(map, reduce, iargs);
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let stop = time::precise_time_ns();
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let elapsed = stop - start;
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elapsed /= 1000000u64;
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log_err "MapReduce completed in " + u64::str(elapsed) + "ms";
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}
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fn read_word(r: io::reader) -> option<str> {
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let w = "";
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while !r.eof() {
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let c = r.read_char();
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if is_word_char(c) {
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w += str::from_char(c);
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} else { if w != "" { ret some(w); } }
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}
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ret none;
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}
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fn is_digit(c: char) -> bool {
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alt c {
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'0' { true }
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'1' { true }
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'2' { true }
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'3' { true }
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'4' { true }
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'5' { true }
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'6' { true }
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'7' { true }
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'8' { true }
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'9' { true }
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_ { false }
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}
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}
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fn is_alpha_lower(c: char) -> bool {
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alt c {
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'a' { true }
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'b' { true }
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'c' { true }
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'd' { true }
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'e' { true }
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'f' { true }
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'g' { true }
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'h' { true }
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'i' { true }
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'j' { true }
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'k' { true }
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'l' { true }
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'm' { true }
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'n' { true }
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'o' { true }
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'p' { true }
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'q' { true }
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'r' { true }
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's' { true }
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't' { true }
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'u' { true }
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'v' { true }
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'w' { true }
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'x' { true }
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'y' { true }
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'z' { true }
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_ { false }
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}
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}
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fn is_alpha_upper(c: char) -> bool {
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alt c {
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'A' { true }
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'B' { true }
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'C' { true }
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'D' { true }
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'E' { true }
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'F' { true }
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'G' { true }
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'H' { true }
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'I' { true }
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'J' { true }
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'K' { true }
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'L' { true }
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'M' { true }
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'N' { true }
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'O' { true }
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'P' { true }
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'Q' { true }
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'R' { true }
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'S' { true }
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'T' { true }
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'U' { true }
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'V' { true }
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'W' { true }
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'X' { true }
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'Y' { true }
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'Z' { true }
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_ { false }
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}
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}
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fn is_alpha(c: char) -> bool { is_alpha_upper(c) || is_alpha_lower(c) }
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fn is_word_char(c: char) -> bool { is_alpha(c) || is_digit(c) || c == '_' }
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