2016 SOS_RWLock

Ewald Cress continues his series on internals, and looks at how SOS_RWLock has changed in SQL Server 2016:

Allow me to call out some layout comparison points against the 2014 version:

  • There is no separate member to track the shared reader count.

  • The four-byte spinlock is gone.

  • The four-byte waiting writer count is gone.

  • The two chunks of four-byte padding (for qword alignment of pointers) are gone.

  • The WaitListEntry structure hasn’t changed at all.

Ewald also covers Compare-And-Swap operations in detail.  Definitely a good read.

Related Posts

Trigger Spirals

David Fowler tells a story of woe, one which is totally not his fault: To do this, a trigger was created which would send all the details via a Service Broker message to another SQL Server, this SQL Server was used to hold details of the AD accounts and from there, changes were automatically propagated […]

Read More

Triggers: Good, Bad, Mostly Ugly

Bob Pusateri walks us through a poorly-written DDL trigger: First, the scope. While the application that deployed this trigger has its own database, AppDB, this trigger is firing for events on the entire server, which is what the ON ALL SERVER line means. Any qualifying event on this server, even if it pertains to another application with a separate […]

Read More

Categories

June 2016
MTWTFSS
« May Jul »
 12345
6789101112
13141516171819
20212223242526
27282930