[oe-commits] [bitbake] 04/10: persist_data: Enable Write Ahead Log
git at git.openembedded.org
git at git.openembedded.org
Tue Aug 14 09:49:20 UTC 2018
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rpurdie pushed a commit to branch master-next
in repository bitbake.
commit f99c049088d3f357e393a699e41d270861c43b93
Author: Joshua Watt <jpewhacker at gmail.com>
AuthorDate: Thu Aug 9 17:08:28 2018 -0500
persist_data: Enable Write Ahead Log
Enabling the write ahead log improves database reliability, speeds up
writes (since they mostly happen sequentially), and speeds up readers
(since they are no longer blocked by most write operations). The
persistent database is very read heavy, so the auto-checkpoint size is
reduced from the default (usually 1000) to 100 so that reads remain
fast.
Signed-off-by: Joshua Watt <JPEWhacker at gmail.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
lib/bb/persist_data.py | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/lib/bb/persist_data.py b/lib/bb/persist_data.py
index 2bc3e76..9a4e7dd 100644
--- a/lib/bb/persist_data.py
+++ b/lib/bb/persist_data.py
@@ -278,7 +278,12 @@ class PersistData(object):
def connect(database):
connection = sqlite3.connect(database, timeout=5)
- connection.execute("pragma synchronous = off;")
+ connection.execute("pragma synchronous = normal;")
+ # Enable WAL and keep the autocheckpoint length small (the default is
+ # usually 1000). Persistent caches are usually read-mostly, so keeping
+ # this short will keep readers running quickly
+ connection.execute("pragma journal_mode = WAL;")
+ connection.execute("pragma wal_autocheckpoint = 100;")
connection.text_factory = str
return connection
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