[oe-commits] [bitbake] 01/04: hashserv: Turn off sqlite synchronous mode
git at git.openembedded.org
git at git.openembedded.org
Wed Jul 24 14:56:43 UTC 2019
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rpurdie pushed a commit to branch master-next
in repository bitbake.
commit 38bc42c2aa3564e4b90485af8855f0c642c7af36
Author: Richard Purdie <richard.purdie at linuxfoundation.org>
AuthorDate: Wed Jul 24 14:08:30 2019 +0100
hashserv: Turn off sqlite synchronous mode
We're seeing performance problems with hashserv running on a normal build
system. The cause seems to be the large amounts of file IO that builds involve
blocking writes to the database. Since sqlite blocks on the sync calls, this
causes a significant problem.
Since if we lose power we have bigger problems, run with synchronous=off
to avoid locking and put the jounral into memory to avoid any write issues
there too.
This took writes from 120s down to negligible in my tests, which means
hashserv then responds promptly to requests.
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
lib/hashserv/__init__.py | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/hashserv/__init__.py b/lib/hashserv/__init__.py
index 7ec9b64..544bc86 100644
--- a/lib/hashserv/__init__.py
+++ b/lib/hashserv/__init__.py
@@ -21,6 +21,8 @@ class HashEquivalenceServer(BaseHTTPRequestHandler):
def opendb(self):
self.db = sqlite3.connect(self.dbname)
self.db.row_factory = sqlite3.Row
+ self.db.execute("PRAGMA synchronous = OFF;")
+ self.db.execute("PRAGMA journal_mode = MEMORY;")
def do_GET(self):
try:
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