feat: persistent program cache for faster replay warmup #162
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Add a new config option `persist_program_cache` under [tuning] that: - Saves compiled SBPF programs to disk on shutdown - Reloads them on startup to speed up replay warmup Since program compilation is expensive and the same programs are used repeatedly, persisting the cache can significantly reduce warmup time after restarts. Also reduces vote account cache size from 5000 to 2000 entries since there are only ~600 validators on mainnet. Config: tuning.persist_program_cache = true/false (default: false)
- Upgrade otter cache library from v1 to v2 - Remove Cost() anti-pattern per otter docs (use count-based eviction) - Add configurable cache sizes to [tuning] config section - Enable persist_program_cache by default for faster restarts - Use otter v2 API: GetIfPresent(), Invalidate(), All() iterator 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Ensures the persistent program cache file is removed during fresh snapshot builds to prevent loading stale cache from a previous run. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Show whether program cache persistence is enabled in the "initializing caches" log message for both verify-range and verify-live commands.
Store the snapshot slot in the program cache file and validate it on load. If the cache was built from a different snapshot, discard it to prevent potential state mismatch issues. This protects against edge cases where the AccountsDB is replaced or modified but the cache file remains, which could cause incorrect program bytecode to be used during replay.
Update fmtDuration to show minutes and seconds for longer durations instead of raw seconds like "1082.342s". Examples: - < 1s: "123.456ms" - < 1m: "45.2s" - < 1h: "18m2s" - >= 1h: "1h30m45s"
The 3000 entry limit is sufficient since there aren't that many programs on Solana that are frequently used in practice. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Adds disk persistence to the existing in-memory program cache.
Before: Compiled SBPF programs are cached in memory during replay, but when you stop mithril (Ctrl+C) and run it again, the cache starts empty and all programs must be recompiled as they're encountered.
After: When mithril exits, it saves the compiled programs to
program_cache.gob. On the nextmithril run, it loads them back, skipping recompilation and speeding up warmup.Key Changes
pkg/accountsdb/program_cache.go- gob serialization/deserialization of compiled programstuning.persist_program_cache(default: true)program_cache.gobproperly removed when rebuilding AccountsDBConfiguration
Cache Defaults
Test plan
program_cache.gobis created in accountsdb dir🤖 Generated with Claude Code