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changeset 2807:89426d83b028 draft

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Default to DB_TXN_WRITE_NOSYNC for all transactional operations * 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.
author Jeff Garzik <jgarzik@exmulti.com>
date Sat, 19 May 2012 01:25:06 -0400
parents c869fe6105e2
children cadfaef4bc6e
files src/db.cpp src/db.h
diffstat 2 files changed, 2 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -96,6 +96,7 @@
             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(),
--- a/src/db.h
+++ b/src/db.h
@@ -216,7 +216,7 @@
         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);