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// -*- coding: utf-8 -*-
//
// disktest - Hard drive tester
//
// Copyright 2020 Michael Buesch <m@bues.ch>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
use crate::stream::DtStream;
use std::thread;
use std::time::Duration;
pub use crate::stream::DtStreamType;
pub use crate::stream::DtStreamChunk;
pub struct DtStreamAgg {
streams: Vec<DtStream>,
current_index: usize,
is_active: bool,
}
impl DtStreamAgg {
pub fn new(stype: DtStreamType,
seed: &Vec<u8>,
num_threads: usize) -> DtStreamAgg {
assert!(num_threads > 0);
assert!(num_threads <= std::u16::MAX as usize + 1);
let mut streams = Vec::with_capacity(num_threads);
for i in 0..num_threads {
streams.push(DtStream::new(stype, seed, i as u32));
}
DtStreamAgg {
streams,
current_index: 0,
is_active: false,
}
}
pub fn activate(&mut self) {
for stream in &mut self.streams {
stream.activate();
}
self.current_index = 0;
self.is_active = true;
}
#[inline]
pub fn is_active(&self) -> bool {
self.is_active
}
pub fn get_chunk_size(&self) -> usize {
self.streams[0].get_chunk_size()
}
#[inline]
fn get_chunk(&mut self) -> Option<DtStreamChunk> {
if self.is_active() {
if let Some(chunk) = self.streams[self.current_index].get_chunk() {
self.current_index = (self.current_index + 1) % self.streams.len();
Some(chunk)
} else {
None
}
} else {
None
}
}
pub fn wait_chunk(&mut self) -> DtStreamChunk {
if self.is_active() {
loop {
if let Some(chunk) = self.get_chunk() {
break chunk;
}
thread::sleep(Duration::from_millis(1));
}
} else {
panic!("wait_chunk() called, but stream aggregator is stopped.");
}
}
}
#[cfg(test)]
mod tests {
use crate::generator::{GeneratorChaCha8, GeneratorChaCha12, GeneratorChaCha20};
use super::*;
fn run_test(algorithm: DtStreamType, gen_base_size: usize, chunk_factor: usize) {
let num_threads = 2;
let mut agg = DtStreamAgg::new(algorithm, &vec![1,2,3], num_threads);
agg.activate();
assert_eq!(agg.is_active(), true);
let onestream_chunksize = chunk_factor * gen_base_size;
assert_eq!(agg.get_chunk_size(), onestream_chunksize);
let mut prev_chunks: Option<Vec<DtStreamChunk>> = None;
for _ in 0..4 {
// Generate the next chunk.
let mut chunks = vec![];
for _ in 0..num_threads {
let chunk = agg.wait_chunk();
assert_eq!(chunk.data.len(), onestream_chunksize);
// Check if we have an even distribution.
let mut avg = vec![0; 256];
for i in 0..chunk.data.len() {
let index = chunk.data[i] as usize;
avg[index] += 1;
}
let expected_avg = onestream_chunksize / 256;
let thres = (expected_avg as f32 * 0.93) as usize;
for acount in &avg {
println!("{} {}", acount, thres);
assert!(*acount >= thres);
}
chunks.push(chunk);
}
// Check if the streams are different.
let mut equal = 0;
let nr_check = onestream_chunksize;
for i in 0..nr_check {
if chunks[0].data[i] == chunks[1].data[i] {
equal += 1;
}
}
assert_ne!(equal, 0);
let thres = (nr_check as f32 * 0.01) as usize;
assert!(equal < thres);
// Check if current chunks are different from previous chunks.
if let Some(pchunks) = prev_chunks {
for i in 0..num_threads {
let mut equal = 0;
let nr_check = onestream_chunksize;
for j in 0..nr_check {
if chunks[i].data[j] == pchunks[i].data[j] {
equal += 1;
}
}
assert_ne!(equal, 0);
let thres = (nr_check as f32 * 0.01) as usize;
assert!(equal < thres);
}
}
prev_chunks = Some(chunks);
}
}
#[test]
fn test_chacha8() {
run_test(DtStreamType::CHACHA8,
GeneratorChaCha8::BASE_SIZE,
GeneratorChaCha8::CHUNK_FACTOR);
}
#[test]
fn test_chacha12() {
run_test(DtStreamType::CHACHA12,
GeneratorChaCha12::BASE_SIZE,
GeneratorChaCha12::CHUNK_FACTOR);
}
#[test]
fn test_chacha20() {
run_test(DtStreamType::CHACHA20,
GeneratorChaCha20::BASE_SIZE,
GeneratorChaCha20::CHUNK_FACTOR);
}
}
// vim: ts=4 sw=4 expandtab
|
