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//! Starts a timely dataflow execution from configuration information and per-worker logic. use crate::communication::{initialize_from, Configuration, Allocator, allocator::AllocateBuilder, WorkerGuards}; use crate::dataflow::scopes::Child; use crate::worker::Worker; /// Executes a single-threaded timely dataflow computation. /// /// The `example` method takes a closure on a `Scope` which it executes to initialize and run a /// timely dataflow computation on a single thread. This method is intended for use in examples, /// rather than programs that may need to run across multiple workers. /// /// The `example` method returns whatever the single worker returns from its closure. /// This is often nothing, but the worker can return something about the data it saw in order to /// test computations. /// /// The method aggressively unwraps returned `Result<_>` types. /// /// # Examples /// /// The simplest example creates a stream of data and inspects it. /// /// ```rust /// use timely::dataflow::operators::{ToStream, Inspect}; /// /// timely::example(|scope| { /// (0..10).to_stream(scope) /// .inspect(|x| println!("seen: {:?}", x)); /// }); /// ``` /// /// This next example captures the data and displays them once the computation is complete. /// /// More precisely, the example captures a stream of events (receiving batches of data, /// updates to input capabilities) and displays these events. /// /// ```rust /// use timely::dataflow::operators::{ToStream, Inspect, Capture}; /// use timely::dataflow::operators::capture::Extract; /// /// let data = timely::example(|scope| { /// (0..10).to_stream(scope) /// .inspect(|x| println!("seen: {:?}", x)) /// .capture() /// }); /// /// // the extracted data should have data (0..10) at timestamp 0. /// assert_eq!(data.extract()[0].1, (0..10).collect::<Vec<_>>()); /// ``` pub fn example<T, F>(func: F) -> T where T: Send+'static, F: FnOnce(&mut Child<Worker<crate::communication::allocator::thread::Thread>,u64>)->T+Send+Sync+'static { crate::execute::execute_directly(|worker| worker.dataflow(|scope| func(scope))) } /// Executes a single-threaded timely dataflow computation. /// /// The `execute_directly` constructs a `Worker` and directly executes the supplied /// closure to construct and run a timely dataflow computation. It does not create any /// worker threads, and simply uses the current thread of control. /// /// The closure may return a result, which will be returned from the computation. /// /// # Examples /// ```rust /// use timely::dataflow::operators::{ToStream, Inspect}; /// /// // execute a timely dataflow using three worker threads. /// timely::execute_directly(|worker| { /// worker.dataflow::<(),_,_>(|scope| { /// (0..10).to_stream(scope) /// .inspect(|x| println!("seen: {:?}", x)); /// }) /// }); /// ``` pub fn execute_directly<T, F>(func: F) -> T where T: Send+'static, F: FnOnce(&mut Worker<crate::communication::allocator::thread::Thread>)->T+Send+Sync+'static { let alloc = crate::communication::allocator::thread::Thread::new(); let mut worker = crate::worker::Worker::new(alloc); let result = func(&mut worker); while worker.step() { } result } /// Executes a timely dataflow from a configuration and per-communicator logic. /// /// The `execute` method takes a `Configuration` and spins up some number of /// workers threads, each of which execute the supplied closure to construct /// and run a timely dataflow computation. /// /// The closure may return a `T: Send+'static`, and `execute` returns a result /// containing a `WorkerGuards<T>` (or error information), which can be joined /// to recover the result `T` values from the local workers. /// /// # Examples /// ```rust /// use timely::dataflow::operators::{ToStream, Inspect}; /// /// // execute a timely dataflow using three worker threads. /// timely::execute(timely::Configuration::Process(3), |worker| { /// worker.dataflow::<(),_,_>(|scope| { /// (0..10).to_stream(scope) /// .inspect(|x| println!("seen: {:?}", x)); /// }) /// }).unwrap(); /// ``` /// /// The following example demonstrates how one can extract data from a multi-worker execution. /// In a multi-process setting, each process will only receive those records present at workers /// in the process. /// /// ```rust /// use std::sync::{Arc, Mutex}; /// use timely::dataflow::operators::{ToStream, Inspect, Capture}; /// use timely::dataflow::operators::capture::Extract; /// /// // get send and recv endpoints, wrap send to share /// let (send, recv) = ::std::sync::mpsc::channel(); /// let send = Arc::new(Mutex::new(send)); /// /// // execute a timely dataflow using three worker threads. /// timely::execute(timely::Configuration::Process(3), move |worker| { /// let send = send.lock().unwrap().clone(); /// worker.dataflow::<(),_,_>(move |scope| { /// (0..10).to_stream(scope) /// .inspect(|x| println!("seen: {:?}", x)) /// .capture_into(send); /// }); /// }).unwrap(); /// /// // the extracted data should have data (0..10) thrice at timestamp 0. /// assert_eq!(recv.extract()[0].1, (0..30).map(|x| x / 3).collect::<Vec<_>>()); /// ``` pub fn execute<T, F>(mut config: Configuration, func: F) -> Result<WorkerGuards<T>,String> where T:Send+'static, F: Fn(&mut Worker<Allocator>)->T+Send+Sync+'static { if let Configuration::Cluster { ref mut log_fn, .. } = config { *log_fn = Box::new(|events_setup| { let mut result = None; if let Ok(addr) = ::std::env::var("TIMELY_COMM_LOG_ADDR") { use ::std::net::TcpStream; use crate::logging::BatchLogger; use crate::dataflow::operators::capture::EventWriter; eprintln!("enabled COMM logging to {}", addr); if let Ok(stream) = TcpStream::connect(&addr) { let writer = EventWriter::new(stream); let mut logger = BatchLogger::new(writer); result = Some(crate::logging_core::Logger::new( ::std::time::Instant::now(), events_setup, move |time, data| logger.publish_batch(time, data) )); } else { panic!("Could not connect to communication log address: {:?}", addr); } } result }); } let (allocators, other) = config.try_build()?; initialize_from(allocators, other, move |allocator| { let mut worker = Worker::new(allocator); // If an environment variable is set, use it as the default timely logging. if let Ok(addr) = ::std::env::var("TIMELY_WORKER_LOG_ADDR") { use ::std::net::TcpStream; use crate::logging::{BatchLogger, TimelyEvent}; use crate::dataflow::operators::capture::EventWriter; if let Ok(stream) = TcpStream::connect(&addr) { let writer = EventWriter::new(stream); let mut logger = BatchLogger::new(writer); worker.log_register() .insert::<TimelyEvent,_>("timely", move |time, data| logger.publish_batch(time, data) ); } else { panic!("Could not connect logging stream to: {:?}", addr); } } let result = func(&mut worker); while worker.step() { } result }) } /// Executes a timely dataflow from supplied arguments and per-communicator logic. /// /// The `execute` method takes arguments (typically `std::env::args()`) and spins up some number of /// workers threads, each of which execute the supplied closure to construct and run a timely /// dataflow computation. /// /// The closure may return a `T: Send+'static`, and `execute` returns a result /// containing a `WorkerGuards<T>` (or error information), which can be joined /// to recover the result `T` values from the local workers. /// /// The arguments `execute` currently understands are: /// /// `-w, --workers`: number of per-process worker threads. /// /// `-n, --processes`: number of processes involved in the computation. /// /// `-p, --process`: identity of this process; from 0 to n-1. /// /// `-h, --hostfile`: a text file whose lines are "hostname:port" in order of process identity. /// If not specified, `localhost` will be used, with port numbers increasing from 2101 (chosen /// arbitrarily). /// /// # Examples /// /// ```rust /// use timely::dataflow::operators::{ToStream, Inspect}; /// /// // execute a timely dataflow using command line parameters /// timely::execute_from_args(std::env::args(), |worker| { /// worker.dataflow::<(),_,_>(|scope| { /// (0..10).to_stream(scope) /// .inspect(|x| println!("seen: {:?}", x)); /// }) /// }).unwrap(); /// ``` /// ```ignore /// host0% cargo run -- -w 2 -n 4 -h hosts.txt -p 0 /// host1% cargo run -- -w 2 -n 4 -h hosts.txt -p 1 /// host2% cargo run -- -w 2 -n 4 -h hosts.txt -p 2 /// host3% cargo run -- -w 2 -n 4 -h hosts.txt -p 3 /// ``` /// ```ignore /// % cat hosts.txt /// host0:port /// host1:port /// host2:port /// host3:port /// ``` pub fn execute_from_args<I, T, F>(iter: I, func: F) -> Result<WorkerGuards<T>,String> where I: Iterator<Item=String>, T:Send+'static, F: Fn(&mut Worker<Allocator>)->T+Send+Sync+'static, { let configuration = Configuration::from_args(iter)?; execute(configuration, func) } /// Executes a timely dataflow from supplied allocators and logging. /// /// Refer to [`execute`](fn.execute.html) for more details. /// /// ```rust /// use timely::dataflow::operators::{ToStream, Inspect}; /// /// // execute a timely dataflow using command line parameters /// let (builders, other) = timely::Configuration::Process(3).try_build().unwrap(); /// timely::execute::execute_from(builders, other, |worker| { /// worker.dataflow::<(),_,_>(|scope| { /// (0..10).to_stream(scope) /// .inspect(|x| println!("seen: {:?}", x)); /// }) /// }).unwrap(); /// ``` pub fn execute_from<A, T, F>(builders: Vec<A>, others: Box<::std::any::Any>, func: F) -> Result<WorkerGuards<T>,String> where A: AllocateBuilder+'static, T: Send+'static, F: Fn(&mut Worker<<A as AllocateBuilder>::Allocator>)->T+Send+Sync+'static { initialize_from(builders, others, move |allocator| { let mut worker = Worker::new(allocator); let result = func(&mut worker); while worker.step() { } result }) }