Switch back to our read/write file lock.
Switch back to our read/write file lock.

Unlock notify doesn't allow reads concurrent with a write even in WAL mode.

Thus concludes our saga. The final verdict was a complex mix of bugs with our pulls, limits of our VFS, not understanding the right configuration options, measuring our performance incorrectly, and not knowing the limits of the system.

At this point we only have one thing left to do: see if we can speed up each individual submission.

Ryezhang/stronglink,guiquanz/stronglink,Ryezhang/stronglink,feld/stronglink,Lacra17/stronglink,rmoorman/stronglink,btrask/stronglink,yamingd/stronglink,yamingd/stronglink,rmoorman/stronglink,iOSCowboy/stronglink,yamingd/stronglink,btrask/stronglink,iOSCowboy/stronglink,guiquanz/stronglink,nkatsaros/stronglink,iOSCowboy/stronglink,guiquanz/stronglink,feld/stronglink,btrask/stronglink,shaunstanislaus/stronglink,Lacra17/stronglink,btrask/stronglink,shaunstanislaus/stronglink,nkatsaros/stronglink,Ryezhang/stronglink,rmoorman/stronglink,shaunstanislaus/stronglink,nkatsaros/stronglink,feld/stronglink,Lacra17/stronglink