flexi_logger 0.18.0

An easy-to-configure and flexible logger that writes logs to stderr and/or to files. It allows custom logline formats, and it allows changing the log specification at runtime. It also allows defining additional log streams, e.g. for alert or security messages.
Documentation 
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#![feature(extern_crate_item_prelude)]
#![feature(test)]

extern crate test;
use flexi_logger::{FileSpec, Logger};
use log::{error, trace};
use test::Bencher;

#[bench]
fn b10_no_logger_active(b: &mut Bencher) {
    b.iter(use_error);
}

#[bench]
fn b20_initialize_logger(_: &mut Bencher) {
    Logger::try_with_str("info")
        .unwrap()
        .log_to_file(FileSpec::default().directory("log_files"))
        .start()
        .unwrap_or_else(|e| panic!("Logger initialization failed with {}", e));
}

#[bench]
fn b30_relevant_logs(b: &mut Bencher) {
    b.iter(use_error);
}

#[bench]
fn b40_suppressed_logs(b: &mut Bencher) {
    b.iter(use_trace);
}

fn use_error() {
    for _ in 1..100 {
        error!("This is an error message");
    }
}
fn use_trace() {
    for _ in 1..100 {
        trace!("This is a trace message");
    }
}