[oe-commits] [bitbake] 04/12: hashserv: Turn off sqlite synchronous mode

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rpurdie pushed a commit to branch master
in repository bitbake.

commit 7ae56a4d4fcf66e1da1581c70f75e30bfdf3ed83
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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