Re: BFS cpu scheduler and skip list implementation

Andi Kleen
2011-09-24T07:35:26Z

On Sat, Sep 24, 2011 at 12:14:21PM +1000, Con Kolivas wrote:
> On Sat, 24 Sep 2011 11:21:06 Andi Kleen wrote:
> > Con Kolivas <kernel@kolivas.org> writes:
> > > +struct nodeStructure {
> > > + int level; /* Levels in this structure */
> > > + keyType key;
> > > + valueType value;
> > > + skiplist_node *next[16];
> > > + skiplist_node *prev[16];
> > > +};
> >
> > That's 128 byte / 2 cache lines, not too bad, but it limits
> > the maximum number of tasks that can be efficiently handled
> > (my guess to around 64k with maxlevel == 16, but someone may
> > correct me on that)
>
> Thanks very much for your informed comments. Do you mean once 64k of tasks are
> queued concurrently, or after 64k of entries have gone in +/- been removed?

queued concurrently I believe.

-Andi

--
ak@linux.intel.com -- Speaking for myself only.