> Is your workload bigger than RAM?
RAM is bigger than workload (more than a couple of times).
> I think a good bit of the contention
> you're seeing in that listing is populating shared_buffers - and might
> actually vanish once you're halfway cached.
> From what I've seen so far the bigger problem than contention in the
> lwlocks itself, is the spinlock protecting the lwlocks...
Could you clarify a bit what do you mean by "halfway cached" and "spinlock protecting the lwlocks".
