⚡ Bolt: Cache color map to avoid per-plugin allocations#90
⚡ Bolt: Cache color map to avoid per-plugin allocations#90
Conversation
Currently, the `colors.ColorMap()` function creates and returns a new map for every plugin invocation. Because plugins are evaluated frequently and potentially concurrently in a loop, this leads to unnecessary memory allocations and garbage collection overhead. This change caches the color map lazily within the `StatusLine` struct using `sync.Once`. Impact: Eliminates one map allocation per plugin execution. Measurement: This is a micro-optimization preventing repeated map instantiations for static data, resulting in less heap pressure and faster plugin execution. Co-authored-by: himattm <6266621+himattm@users.noreply.github.com>
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Code Review
This pull request optimizes performance by caching the color map in the StatusLine struct using sync.Once to avoid repeated allocations during parallel plugin execution. However, the review identifies a potential data race because the shared map is a reference type; if concurrent plugins modify the map, it will cause thread-safety issues. It is recommended to treat the map as read-only or use a struct to pass color data by value.
| func (sl *StatusLine) getColorMap() map[string]string { | ||
| sl.colorMapOnce.Do(func() { | ||
| sl.colorMap = colors.ColorMap() | ||
| }) | ||
| return sl.colorMap | ||
| } |
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Sharing the same map instance across multiple concurrent plugin executions introduces a potential data race. In Go, maps are reference types, and since renderLine executes plugins in parallel goroutines, any native plugin that modifies the Colors map will cause a race condition and affect other plugins running concurrently.
While this optimization reduces allocations, it sacrifices the isolation provided by the previous implementation (which created a fresh map per plugin). To maintain safety, ensure that all native plugins treat the Colors map as read-only. Alternatively, if you want to avoid allocations entirely and ensure safety, consider changing the Colors field in plugin.Input to a struct, which would be passed by value and thus be inherently thread-safe.
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Closing as superseded by direct commit 42f3149 on main, which consolidated the StatusLine color-map caching optimization without the generated .jules note. |
Understood. Acknowledging that this work is superseded by a direct commit on main, and stopping work on this task. |
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💡 What: Caches the map generated by
colors.ColorMap()lazily within theStatusLinestruct usingsync.Once.🎯 Why:
runPlugin()previously invokedcolors.ColorMap()on every execution, leading to unnecessary repeated map allocations in memory since the color constants are static.📊 Impact: Eliminates one map allocation per plugin execution within the concurrent rendering loop, reducing garbage collection overhead and heap pressure.
🔬 Measurement: Verify that
go test ./...passes to ensure plugin configuration parsing behaves identically. The code is structured similarly to caching the bash plugins (sync.Once).PR created automatically by Jules for task 7323222668004272678 started by @himattm