QuantConnect / QuantConnect/Lean
Stream backtest logs to disk instead of holding in memory
Open
Nobody has claimed this yet.
bug
feature
impact-low
- Dominant language
- C#
- Stars
- 21.7k
- Forks
- 5.3k
- Avg merge
- 2d 22h
- Merged PRs (30d)
- 34
Description
Expected Behavior
While backtesting stream logs to a temporary file instead of holding in memory to prevent memory issues.
Actual Behavior
Hold entire log in memory
Potential Solution
Adjust the backtest log handler.
Reproducing the Problem
Run a backtest with large volume of logging and monitor memory.
Checklist
- I have completely filled out this template
- I have confirmed that this issue exists on the current
masterbranch - I have confirmed that this is not a duplicate issue by searching issues
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Locate the backtest log handler in the Lean codebase and begin by tracing how large-volume backtest logs are currently accumulated. Reproduce the issue with a high-logging backtest while monitoring memory. Done means logs stream to a temporary file instead of remaining entirely in memory, with the backtest output preserved.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100