What are some performance tips for Haskell's STM?
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What are some performance tips for Haskell's STM?
To improve performance in Haskell's Software Transactional Memory (STM), consider the following tips: 1. Minimize the size of transactions. 2. Use retry wisely to avoid unnecessary retries. 3. Favor TVar over MVar for shared state. 4. Batch updates when possible.
Can you explain why minimizing transaction size is important?
Minimizing transaction size is crucial because larger transactions can lead to increased contention and longer wait times. Smaller transactions are more likely to complete quickly, reducing the chances of conflicts.
What is the difference between TVar and MVar?
TVar is designed for use with STM and allows for composable transactions, while MVar is a mutable variable that can be used for synchronization but does not support transactions. TVar is generally preferred in STM for better performance.
How can I batch updates in STM?
You can batch updates by grouping multiple changes into a single transaction. This reduces the overhead of multiple transactions and can improve performance by minimizing the number of retries and conflicts.
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