From 625a9fd9326ac9b240dec520c156a03b1b7515b7 Mon Sep 17 00:00:00 2001
From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com>
Date: Mon, 9 Dec 2019 01:03:35 -0800
Subject: [PATCH] Properly set parallelism (#7370) (#7372)

automerge
---
 ledger/src/blocktree_db.rs | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/ledger/src/blocktree_db.rs b/ledger/src/blocktree_db.rs
index 67bac239d1..a140f34bb3 100644
--- a/ledger/src/blocktree_db.rs
+++ b/ledger/src/blocktree_db.rs
@@ -13,8 +13,6 @@ use solana_client::rpc_request::RpcTransactionStatus;
 use solana_sdk::{clock::Slot, signature::Signature};
 use std::{collections::HashMap, fs, marker::PhantomData, path::Path, sync::Arc};
 
-// A good value for this is the number of cores on the machine
-const TOTAL_THREADS: i32 = 8;
 const MAX_WRITE_BUFFER_SIZE: u64 = 256 * 1024 * 1024; // 256MB
 
 // Column family for metadata about a leader slot
@@ -727,8 +725,7 @@ fn get_db_options() -> Options {
     let mut options = Options::default();
     options.create_if_missing(true);
     options.create_missing_column_families(true);
-    options.increase_parallelism(TOTAL_THREADS);
-    options.set_max_background_flushes(4);
-    options.set_max_background_compactions(4);
+    // A good value for this is the number of cores on the machine
+    options.increase_parallelism(sys_info::cpu_num().unwrap() as i32);
     options
 }