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#[macro_use]
extern crate clap;
extern crate humansize;
extern crate num_cpus;
extern crate rayon;
extern crate crossbeam_channel;
mod walk;
use std::path::PathBuf;
use clap::{App, AppSettings, Arg};
use humansize::{file_size_opts, FileSize};
use walk::Walk;
fn print_result(size: u64) {
println!(
"{} ({} bytes)",
size.file_size(file_size_opts::DECIMAL).unwrap(),
size
);
}
fn main() {
let app = App::new(crate_name!())
.setting(AppSettings::ColorAuto)
.setting(AppSettings::ColoredHelp)
.setting(AppSettings::DeriveDisplayOrder)
.setting(AppSettings::UnifiedHelpMessage)
.version(crate_version!())
.about("Compute disk usage for the current directory")
.arg(
Arg::with_name("threads")
.long("threads")
.short("j")
.value_name("N")
.takes_value(true)
.help("Set the number of threads (default: 3 x num cores)"),
);
let matches = app.get_matches();
// Setting the number of threads to 3x the number of cores is a good tradeoff between
// cold-cache and warm-cache runs. For a cold disk cache, we are limited by disk IO and
// therefore want the number of threads to be rather large in order for the IO scheduler to
// plan ahead. On the other hand, the number of threads shouldn't be too high for warm disk
// caches where we would otherwise pay a higher synchronization overhead.
let num_threads = matches
.value_of("threads")
.and_then(|t| t.parse().ok())
.unwrap_or(3 * num_cpus::get());
let paths = &[PathBuf::from(".")];
let walk = Walk::new(paths, num_threads);
let size = walk.run();
print_result(size);
}
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