+1
> On Jul 9, 2019, at 11:48 AM, Hannes Wallnöfer <hannes.wallnoe...@oracle.com>
> wrote:
>
> Please review:
>
> JBS: https://bugs.openjdk.java.net/browse/JDK-8223451
> Webrev: http://cr.openjdk.java.net/~hannesw/8223451/webrev.00/
>
> A lot of Nashorn usage we see is with command line scripts from the Node.js
> and Web ecosystems. These usually run for a short time, but can be quite
> complex and large. Optimistic compilation is a bad match for this type of
> application, as a lot of time is spent optimizing and recompiling code that
> is only run once. Additionally, optimistic types is both the newest and one
> of the most complex parts of Nashorn, so a large proportion of Nashorn bugs
> turn out to be related to it.
>
> Based on these considerations this change disables optimistic types by
> default. Users that want to use it can easily continue to do so using a
> command line or engine option. The change is straightforward and does not
> affect user observable behaviour apart from the amount of time spent in
> script execution and compilation.
>
> Hannes
