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change to fraction-based approach

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This commit is contained in:
Jonathan de Jong 2021-07-19 16:25:41 +02:00
parent 0f2dc9a239
commit 7e579f8d34
2 changed files with 16 additions and 21 deletions
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19
src/database.rs
View file

@ -53,8 +53,8 @@ pub struct Config {
sqlite_wal_clean_second_interval: u32,
#[serde(default = "default_sqlite_wal_clean_second_timeout")]
sqlite_wal_clean_second_timeout: u32,
#[serde(default = "default_sqlite_spillover_reap_chunk")]
sqlite_spillover_reap_chunk: u32,
#[serde(default = "default_sqlite_spillover_reap_fraction")]
sqlite_spillover_reap_fraction: u32,
#[serde(default = "default_sqlite_spillover_reap_interval_secs")]
sqlite_spillover_reap_interval_secs: u32,
#[serde(default = "default_max_request_size")]
@ -125,12 +125,12 @@ fn default_sqlite_wal_clean_second_timeout() -> u32 {
2
}
fn default_sqlite_spillover_reap_chunk() -> u32 {
5
fn default_sqlite_spillover_reap_fraction() -> u32 {
2
}
fn default_sqlite_spillover_reap_interval_secs() -> u32 {
10
60
}
fn default_max_request_size() -> u32 {
@ -558,10 +558,9 @@ impl Database {
#[cfg(feature = "sqlite")]
pub async fn start_spillover_reap_task(engine: Arc<Engine>, config: &Config) {
let chunk_size = match config.sqlite_spillover_reap_chunk {
0 => None, // zero means no chunking, reap everything
a @ _ => Some(a),
};
use std::convert::TryInto;
let fraction_factor = config.sqlite_spillover_reap_fraction.max(1).try_into().unwrap(/* We just converted it to be at least 1 */);
let interval_secs = config.sqlite_spillover_reap_interval_secs as u64;
let weak = Arc::downgrade(&engine);
@ -577,7 +576,7 @@ impl Database {
i.tick().await;
if let Some(arc) = Weak::upgrade(&weak) {
arc.reap_spillover(chunk_size);
arc.reap_spillover_by_fraction(fraction_factor);
} else {
break;
}

18
src/database/abstraction/sqlite.rs
View file

@ -9,6 +9,7 @@ use rusqlite::{params, Connection, DatabaseName::Main, OptionalExtension};
use std::{
collections::BTreeMap,
future::Future,
num::NonZeroU32,
ops::Deref,
path::{Path, PathBuf},
pin::Pin,
@ -241,19 +242,14 @@ impl Engine {
.map_err(Into::into)
}
// Reaps (at most) X amount of connections if `amount` is Some.
// If none, reaps all currently idle connections.
pub fn reap_spillover(&self, amount: Option<u32>) {
// Reaps (at most) (.len() / `fraction`) (rounded down, min 1) connections.
pub fn reap_spillover_by_fraction(&self, fraction: NonZeroU32) {
let mut reaped = 0;
if let Some(amount) = amount {
for _ in 0..amount {
if self.pool.spills.try_take().is_some() {
reaped += 1;
}
}
} else {
while let Some(_) = self.pool.spills.try_take() {
let amount = ((self.pool.spills.1.len() as u32) / fraction).max(1);
for _ in 0..amount {
if self.pool.spills.try_take().is_some() {
reaped += 1;
}
}