e27b88d5bd
Not all users of MemWriter need to seek, but having MemWriter seekable adds between 3-29% in overhead in certain circumstances. This fixes that performance gap by making a non-seekable MemWriter, and creating a new SeekableMemWriter for those circumstances when that functionality is actually needed. ``` test io::mem::test::bench_buf_reader ... bench: 682 ns/iter (+/- 85) test io::mem::test::bench_buf_writer ... bench: 580 ns/iter (+/- 57) test io::mem::test::bench_mem_reader ... bench: 793 ns/iter (+/- 99) test io::mem::test::bench_mem_writer_001_0000 ... bench: 48 ns/iter (+/- 27) test io::mem::test::bench_mem_writer_001_0010 ... bench: 65 ns/iter (+/- 27) = 153 MB/s test io::mem::test::bench_mem_writer_001_0100 ... bench: 132 ns/iter (+/- 12) = 757 MB/s test io::mem::test::bench_mem_writer_001_1000 ... bench: 802 ns/iter (+/- 151) = 1246 MB/s test io::mem::test::bench_mem_writer_100_0000 ... bench: 481 ns/iter (+/- 28) test io::mem::test::bench_mem_writer_100_0010 ... bench: 1957 ns/iter (+/- 126) = 510 MB/s test io::mem::test::bench_mem_writer_100_0100 ... bench: 8222 ns/iter (+/- 434) = 1216 MB/s test io::mem::test::bench_mem_writer_100_1000 ... bench: 82496 ns/iter (+/- 11191) = 1212 MB/s test io::mem::test::bench_seekable_mem_writer_001_0000 ... bench: 48 ns/iter (+/- 2) test io::mem::test::bench_seekable_mem_writer_001_0010 ... bench: 64 ns/iter (+/- 2) = 156 MB/s test io::mem::test::bench_seekable_mem_writer_001_0100 ... bench: 129 ns/iter (+/- 7) = 775 MB/s test io::mem::test::bench_seekable_mem_writer_001_1000 ... bench: 801 ns/iter (+/- 159) = 1248 MB/s test io::mem::test::bench_seekable_mem_writer_100_0000 ... bench: 711 ns/iter (+/- 51) test io::mem::test::bench_seekable_mem_writer_100_0010 ... bench: 2532 ns/iter (+/- 227) = 394 MB/s test io::mem::test::bench_seekable_mem_writer_100_0100 ... bench: 8962 ns/iter (+/- 947) = 1115 MB/s test io::mem::test::bench_seekable_mem_writer_100_1000 ... bench: 85086 ns/iter (+/- 11555) = 1175 MB/s ``` [breaking-change]
157 lines
3.4 KiB
Rust
157 lines
3.4 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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/*!
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The Rust compiler.
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# Note
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This API is completely unstable and subject to change.
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*/
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#![crate_name = "rustc"]
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#![experimental]
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#![comment = "The Rust compiler"]
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#![license = "MIT/ASL2"]
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#![crate_type = "dylib"]
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#![crate_type = "rlib"]
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#![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
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html_favicon_url = "http://www.rust-lang.org/favicon.ico",
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html_root_url = "http://doc.rust-lang.org/master/")]
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#![allow(deprecated)]
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#![feature(macro_rules, globs, struct_variant, managed_boxes, quote)]
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#![feature(default_type_params, phase, unsafe_destructor)]
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#![allow(unknown_features)] // NOTE: Remove after next snapshot
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#![feature(rustc_diagnostic_macros)]
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extern crate arena;
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extern crate debug;
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extern crate flate;
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extern crate getopts;
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extern crate graphviz;
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extern crate libc;
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extern crate llvm = "rustc_llvm";
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extern crate rustc_back = "rustc_back";
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extern crate serialize;
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extern crate time;
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#[phase(plugin, link)] extern crate log;
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#[phase(plugin, link)] extern crate syntax;
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#[cfg(test)]
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extern crate test;
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mod diagnostics;
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pub mod back {
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pub use rustc_back::abi;
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pub use rustc_back::archive;
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pub use rustc_back::arm;
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pub use rustc_back::mips;
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pub use rustc_back::mipsel;
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pub use rustc_back::rpath;
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pub use rustc_back::svh;
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pub use rustc_back::target_strs;
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pub use rustc_back::x86;
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pub use rustc_back::x86_64;
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pub mod link;
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pub mod lto;
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}
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pub mod middle {
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pub mod astencode;
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pub mod borrowck;
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pub mod cfg;
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pub mod check_const;
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pub mod check_loop;
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pub mod check_match;
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pub mod check_static;
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pub mod const_eval;
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pub mod dataflow;
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pub mod dead;
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pub mod def;
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pub mod dependency_format;
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pub mod effect;
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pub mod entry;
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pub mod expr_use_visitor;
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pub mod freevars;
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pub mod graph;
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pub mod intrinsicck;
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pub mod kind;
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pub mod lang_items;
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pub mod liveness;
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pub mod mem_categorization;
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pub mod pat_util;
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pub mod privacy;
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pub mod reachable;
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pub mod region;
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pub mod resolve;
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pub mod resolve_lifetime;
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pub mod save;
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pub mod stability;
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pub mod subst;
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pub mod trans;
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pub mod ty;
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pub mod ty_fold;
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pub mod typeck;
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pub mod weak_lang_items;
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}
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pub mod front {
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pub mod config;
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pub mod test;
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pub mod std_inject;
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pub mod assign_node_ids_and_map;
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pub mod feature_gate;
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pub mod show_span;
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}
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pub mod metadata;
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pub mod driver;
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pub mod plugin;
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pub mod lint;
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pub mod util {
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pub use rustc_back::fs;
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pub use rustc_back::sha2;
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pub mod common;
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pub mod ppaux;
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pub mod io;
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pub mod nodemap;
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}
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pub mod lib {
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pub use llvm;
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}
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__build_diagnostic_array!(DIAGNOSTICS)
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// A private module so that macro-expanded idents like
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// `::rustc::lint::Lint` will also work in `rustc` itself.
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//
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// `libstd` uses the same trick.
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#[doc(hidden)]
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mod rustc {
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pub use lint;
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}
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pub fn main() {
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let args = std::os::args();
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std::os::set_exit_status(driver::main_args(args.as_slice()));
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}
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