⚡ Bolt: Optimize Context value retrieval and lock duration#36
⚡ Bolt: Optimize Context value retrieval and lock duration#36ashyanSpada wants to merge 1 commit intomasterfrom
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Co-authored-by: ashyanSpada <22587148+ashyanSpada@users.noreply.github.com>
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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the performance and concurrency of the Highlights
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This pull request aims to optimize Context value retrieval. The changes in Context::value and Context::get successfully reduce HashMap lookups and shorten mutex lock duration. However, as noted in my comment, the change to Context::get introduces a performance regression in other unmodified calling functions. Addressing this is important to fully achieve the PR's goals.
| let binding = self.0.lock().unwrap(); | ||
| let value = binding.get(name)?; | ||
| Some(value.clone()) | ||
| self.0.lock().unwrap().get(name).cloned() |
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This new implementation of get is more concise and correctly releases the mutex early. However, it introduces a performance issue with existing callers. By returning a cloned ContextValue, functions like get_variable (which also clones the value) now perform a double clone. This can be significantly slower for large values, which is contrary to the optimization goal of this PR.
To resolve this, all callers of get should be updated to move the value from the returned ContextValue instead of cloning it. For example, get_variable should be changed to:
pub fn get_variable(&self, name: &str) -> Option<Value> {
match self.get(name)? {
ContextValue::Variable(v) => Some(v),
_ => None,
}
}Please update get_variable and get_func accordingly to prevent this performance regression.
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💡 What: Refactored
Context::valueandContext::getto minimize redundant hash map lookups and early-release the mutex before function execution.🎯 Why:
Context::valueperformed two lookups against theHashMapand held aMutexGuardacross the execution of user-supplied inner functions. This caused unnecessary overhead and high lock contention.📊 Impact: Speeds up function calls and variable retrievals by reducing hash map accesses. Prevents potential deadlocks. Benchmarks show
execute_expressionhas a measurable performance gain.🔬 Measurement:
cargo bench execute_expressionverified the performance delta. Tests pass natively.Included a
bolt.mdlearning entry detailing this specific lock duration and hashmap bottleneck architecture.PR created automatically by Jules for task 17899165068091980778 started by @ashyanSpada