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Use gamma distribution for all load testers

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This commit is contained in:
Joakim Frostegård 2022-10-26 19:49:30 +02:00
parent 2b9db63984
commit db561a1101
12 changed files with 65 additions and 55 deletions
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4
aquatic_ws_load_test/src/common.rs
View file

@ -1,6 +1,6 @@
use std::sync::{atomic::AtomicUsize, Arc};
use rand_distr::Pareto;
use rand_distr::Gamma;
pub use aquatic_ws_protocol::*;
@ -19,7 +19,7 @@ pub struct Statistics {
pub struct LoadTestState {
pub info_hashes: Arc<Vec<InfoHash>>,
pub statistics: Arc<Statistics>,
pub pareto: Arc<Pareto<f64>>,
pub gamma: Arc<Gamma<f64>>,
}
#[derive(PartialEq, Eq, Clone, Copy)]

11
aquatic_ws_load_test/src/config.rs
View file

@ -45,10 +45,6 @@ impl Default for Config {
pub struct TorrentConfig {
pub offers_per_request: usize,
pub number_of_torrents: usize,
/// Pareto shape
///
/// Fake peers choose torrents according to Pareto distribution.
pub torrent_selection_pareto_shape: f64,
/// Probability that a generated peer is a seeder
pub peer_seeder_probability: f64,
/// Probability that a generated request is a announce request, as part
@ -57,6 +53,10 @@ pub struct TorrentConfig {
/// Probability that a generated request is a scrape request, as part
/// of sum of the various weight arguments.
pub weight_scrape: usize,
/// Peers choose torrents according to this Gamma distribution shape
pub torrent_gamma_shape: f64,
/// Peers choose torrents according to this Gamma distribution scale
pub torrent_gamma_scale: f64,
}
impl Default for TorrentConfig {
@ -65,9 +65,10 @@ impl Default for TorrentConfig {
offers_per_request: 10,
number_of_torrents: 10_000,
peer_seeder_probability: 0.25,
torrent_selection_pareto_shape: 2.0,
weight_announce: 5,
weight_scrape: 0,
torrent_gamma_shape: 0.2,
torrent_gamma_scale: 100.0,
}
}
}

10
aquatic_ws_load_test/src/main.rs
View file

@ -6,7 +6,7 @@ use aquatic_common::cpu_pinning::glommio::{get_worker_placement, set_affinity_fo
use aquatic_common::cpu_pinning::WorkerIndex;
use glommio::LocalExecutorBuilder;
use rand::prelude::*;
use rand_distr::Pareto;
use rand_distr::Gamma;
mod common;
mod config;
@ -44,12 +44,16 @@ fn run(config: Config) -> ::anyhow::Result<()> {
info_hashes.push(InfoHash(rng.gen()));
}
let pareto = Pareto::new(1.0, config.torrents.torrent_selection_pareto_shape).unwrap();
let gamma = Gamma::new(
config.torrents.torrent_gamma_shape,
config.torrents.torrent_gamma_scale,
)
.unwrap();
let state = LoadTestState {
info_hashes: Arc::new(info_hashes),
statistics: Arc::new(Statistics::default()),
pareto: Arc::new(pareto),
gamma: Arc::new(gamma),
};
let tls_config = create_tls_config().unwrap();

8
aquatic_ws_load_test/src/utils.rs
View file

@ -2,7 +2,7 @@ use std::sync::Arc;
use rand::distributions::WeightedIndex;
use rand::prelude::*;
use rand_distr::Pareto;
use rand_distr::Gamma;
use crate::common::*;
use crate::config::*;
@ -88,12 +88,12 @@ fn create_scrape_request(config: &Config, state: &LoadTestState, rng: &mut impl
#[inline]
fn select_info_hash_index(config: &Config, state: &LoadTestState, rng: &mut impl Rng) -> usize {
pareto_usize(rng, &state.pareto, config.torrents.number_of_torrents - 1)
gamma_usize(rng, &state.gamma, config.torrents.number_of_torrents - 1)
}
#[inline]
fn pareto_usize(rng: &mut impl Rng, pareto: &Arc<Pareto<f64>>, max: usize) -> usize {
let p: f64 = pareto.sample(rng);
fn gamma_usize(rng: &mut impl Rng, gamma: &Arc<Gamma<f64>>, max: usize) -> usize {
let p: f64 = gamma.sample(rng);
let p = (p.min(101.0f64) - 1.0) / 100.0;
(p * max as f64) as usize