From ca3bc54428b67e42258e64b37809f150295b4de4 Mon Sep 17 00:00:00 2001
From: Alex Sharov <AskAlexSharov@gmail.com>
Date: Thu, 29 Dec 2022 14:47:17 +0700
Subject: [PATCH] Shared genesis db (#6465)

---
 core/genesis.go | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/core/genesis.go b/core/genesis.go
index 1c12fa006..918aa3e56 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -26,6 +26,7 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"os"
 	"sync"
 
 	"github.com/c2h5oh/datasize"
@@ -90,6 +91,14 @@ type AuthorityRoundSeal struct {
 	Signature common.Hash `json:"signature"`
 }
 
+var genesisTmpDB kv.RwDB
+var genesisDBLock *sync.Mutex
+
+func init() {
+	genesisTmpDB = mdbx.NewMDBX(log.New()).InMem(os.TempDir()).MapSize(2 * datasize.GB).PageSize(2 * 4096).WriteMergeThreshold(2 * 8192).MustOpen()
+	genesisDBLock = &sync.Mutex{}
+}
+
 func (ga *GenesisAlloc) UnmarshalJSON(data []byte) error {
 	m := make(map[common.UnprefixedAddress]GenesisAccount)
 	if err := json.Unmarshal(data, &m); err != nil {
@@ -370,9 +379,9 @@ func (g *Genesis) ToBlock() (*types.Block, *state.IntraBlockState, error) {
 	go func() { // we may run inside write tx, can't open 2nd write tx in same goroutine
 		// TODO(yperbasis): use memdb.MemoryMutation instead
 		defer wg.Done()
-		tmpDB := mdbx.NewMDBX(log.New()).InMem("").MapSize(2 * datasize.GB).MustOpen()
-		defer tmpDB.Close()
-		tx, err := tmpDB.BeginRw(context.Background())
+		genesisDBLock.Lock()
+		defer genesisDBLock.Unlock()
+		tx, err := genesisTmpDB.BeginRw(context.Background())
 		if err != nil {
 			panic(err)
 		}