William Lee Irwin III wrote:
It will get contention anyway if they're all pounding on the same futex.
OTOH, if they're all threads in the same process, they can hit other
problems. I'll try to find out more about hackbench.
On Fri, Dec 12, 2003 at 12:30:07AM +1100, Nick Piggin wrote:
Oh, sorry I was talking about volanomark. hackbench AFAIK doesn't use
futexes at all, just pipes, and is not threaded at all, so it looks like
a different problem to the volanomark one.
hackbench runs into trouble at large numbers of tasks too though.
Volano is all one process address space so it could be ->page_table_lock;
any chance you could find which spin_lock() call the pounded chunk of the
lock section jumps back to?