Bound the blockstore_process threadpool to a max of 24 threads

ledger/src/blockstore_processor.rs

@@ -86,11 +86,12 @@ struct ReplayEntry {
     starting_index: usize,
 }
 
-// get_max_thread_count to match number of threads in the old code.
-// see: https://github.com/solana-labs/solana/pull/24853
+// Max number of threads to allocate for executing transactions
+const MAX_THREAD_POOL_SIZE: usize = 24;
+
 lazy_static! {
     static ref PAR_THREAD_POOL: ThreadPool = rayon::ThreadPoolBuilder::new()
-        .num_threads(get_max_thread_count())
+        .num_threads(get_max_thread_count().min(MAX_THREAD_POOL_SIZE))
         .thread_name(|i| format!("solBstoreProc{i:02}"))
         .build()
         .unwrap();