e: RFC: ship block chain 1-74000 with release tarballs?

I timed two runs with clean data directories (no contents), -noirc, -addnode=10.10.10.1, Linux 64-bit.  Hardware: SATA SSD

Mainline, no patches:
32 minutes to download 94660 blocks.

Mainline + TxnBegin/TxnCommit in AddToBlockIndex():
25 minutes to download 94660 blocks.

That’s a good optimisation.  I’ll add that next time I update SVN.

More generally, we could also consider this:

dbenv.set_lk_max_objects(10000);
dbenv.set_errfile(fopen(strErrorFile.c_str(), “a”)); /// debug
dbenv.set_flags(DB_AUTO_COMMIT, 1);
+       dbenv.set_flags(DB_TXN_NOSYNC, 1);
ret = dbenv.open(strDataDir.c_str(),
DB_CREATE     |
DB_INIT_LOCK  |
DB_INIT_LOG   |

We would then rely on dbenv.txn_checkpoint(0, 0, 0) in CDB::Close() to flush after wallet writes.

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