918278 - IonMonkey: Enable recompile of script without invalidation

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[Hannes Verschore [:h4writer]]

For bug 911738 it needs to be possible to request a recompile, without throwing the script away. This is because in the recompile we want to inline more functions, but the old script is not incorrect. So can be used and run until the new recompilation is finished and replaces the current script.

Without this bug 911738 improves richards, but decreases performance of raytrace, since we are longer stuck in baseline during compilation. This would also make the proposed second solution in bug 911738 more feasible.

Comment 1

[Hannes Verschore [:h4writer]]

So I created a dummy "recompile without invalidation", just enough to test this claim. With bug 911738 applied I still see the improvement, but we don't have the loss on raytrace anymore \0/. (maybe 0%-1% regression).

Since we need a more robust system and want to handle more cases, I'll improve this patch and also do some research on what is feasible, what works and what not and post the numbers. I also want to try the "Don't inline immediatly idea.". So I'll implement "optimization levels" so we can play with this a bit more.

Also we need to figure out what to do when "offthread compiler" isn't available... Since all these ideas will give most boost in that configuration. But somehow we shouldn't regress without it too much...

Comment 2

[Hannes Verschore [:h4writer]]

This is now possible and works. I.e. we now recompile without invalidating on osrpc mismatch.