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Default to DB_TXN_WRITE_NOSYNC for all transactional operations

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* This is safer than DB_TXN_NOSYNC, and does not appear to impact
  performance.
* Applying this to the dbenv is necessary to avoid many fdatasync(2)
  calls on db 5.x
* We carefully and thoroughly flush databases upon shutdown and
  other important events already.
This commit is contained in:
Jeff Garzik 2012-05-19 01:25:06 -04:00 committed by Jeff Garzik
parent d6615a54c6
commit 394b9298fa
2 changed files with 2 additions and 1 deletions
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1
src/db.cpp
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@ -96,6 +96,7 @@ CDB::CDB(const char *pszFile, const char* pszMode) : pdb(NULL)
dbenv.set_lk_max_locks(10000);
dbenv.set_lk_max_objects(10000);
dbenv.set_errfile(fopen(pathErrorFile.string().c_str(), "a")); /// debug
dbenv.set_flags(DB_TXN_WRITE_NOSYNC, 1);
dbenv.set_flags(DB_AUTO_COMMIT, 1);
dbenv.log_set_config(DB_LOG_AUTO_REMOVE, 1);
ret = dbenv.open(pathDataDir.string().c_str(),

2
src/db.h
View file

@ -216,7 +216,7 @@ public:
if (!pdb)
return false;
DbTxn* ptxn = NULL;
int ret = dbenv.txn_begin(GetTxn(), &ptxn, DB_TXN_NOSYNC);
int ret = dbenv.txn_begin(GetTxn(), &ptxn, DB_TXN_WRITE_NOSYNC);
if (!ptxn || ret != 0)
return false;
vTxn.push_back(ptxn);