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Disk cache: 20 GB default, a free-space reserve and cheaper eviction (#2551)

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- Default disk cache size 20 GB (was 100 GB); settings version 3 migrates the stored old
  default and keeps a size the user chose.
- The cache keeps max(2 GB, 5% of the disk) free: sysinfo::disk_space (df -Pk / PowerShell
  DriveInfo) is read in the background from memory_tick and caps the limit
  (DiskCache::set_disk_space); cache.diskStats reports limitBytes.
- Eviction goes down to 90% of the limit, so the LRU sort runs once per tenth of the limit
  written instead of on every write at the limit.
- Failed writes are counted (cache.diskStats failed) and the first is logged.

Also fixes #2063.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
arnav-hiwarkar
2026-10-28 18:27:31 +05:30
co-authored by Claude Opus 5.5
parent fa9cf47175
commit 6efeae3793
10 changed files with 243 additions and 39 deletions
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crates/engine/src/tests/disk_cache.rs
+1 -1
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@@ -35,7 +35,7 @@ fn disk_cache_settings_persistence_and_invalidation() {
let mut s = session(&dir);
let st = s.execute_checked("cache.diskStats", json!({})).unwrap();
assert_eq!(st["enabled"], json!(true));
assert_eq!(st["maxBytes"], json!(100u64 << 30));
assert_eq!(st["maxBytes"], json!(20u64 << 30));
let cid = project(&mut s);
let t = s.time();
let first = s.render(cid, t, RenderOpts::default());