Scheduler

The component within Solana's TPU pipeline responsible for ordering transactions from the banking stage's queues, acquiring account read/write locks, and dispatching transactions to worker threads for execution. The scheduler enforces account conflict serialization (ensuring write-locked accounts are processed by only one thread at a time) while maximizing parallelism across non-conflicting transactions. Solana has iterated on scheduler designs (including the central scheduler introduced in 2024) to improve throughput and reduce lock contention under load.