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619806d7a9
Disable Write-Ahead Log for the cached module source database. This brings SQLite connection cost on startup from 2.5% to 1.6%.
57 lines
1.2 KiB
Rust
57 lines
1.2 KiB
Rust
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
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use std::hash::Hasher;
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/// A very fast insecure hasher that uses the xxHash algorithm.
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#[derive(Default)]
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pub struct FastInsecureHasher(twox_hash::XxHash64);
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impl FastInsecureHasher {
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pub fn new() -> Self {
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Self::default()
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}
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pub fn write_str(&mut self, text: &str) -> &mut Self {
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self.write(text.as_bytes());
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self
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}
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pub fn write(&mut self, bytes: &[u8]) -> &mut Self {
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self.0.write(bytes);
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self
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}
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pub fn write_u8(&mut self, value: u8) -> &mut Self {
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self.0.write_u8(value);
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self
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}
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pub fn write_u64(&mut self, value: u64) -> &mut Self {
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self.0.write_u64(value);
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self
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}
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pub fn write_hashable(
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&mut self,
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hashable: &impl std::hash::Hash,
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) -> &mut Self {
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hashable.hash(&mut self.0);
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self
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}
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pub fn finish(&self) -> u64 {
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self.0.finish()
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}
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}
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/// Disable write-ahead-logging and tweak some other stuff.
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/// We want to favor startup time over cache performance and
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/// creating a WAL is expensive on startup.
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pub static INITIAL_PRAGMAS: &str = "
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PRAGMA journal_mode=OFF;
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PRAGMA synchronous=NORMAL;
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PRAGMA temp_store=memory;
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PRAGMA page_size=4096;
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PRAGMA mmap_size=6000000;
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PRAGMA optimize;
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";
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