[m-users.] Stackoverflow from --intermodule-optimisation

[Maxime Van Assche]

On 25/09/2013 07:26, Michael Day wrote:
> Hi Paul,
>
>> It is reported to (comments in the manual) that it can slow programs down.
>> My guess is that this means the chance of slowing a program down is almost
>> as good as the chance that it'll speed up.
>
> Is there a canonical example of code that runs slower with this optimisation?
>
> What is the mechanism of the slowdown, just having more arguments to pass down?
>
> Unless the slowdown really is significant, I would still suggest enabling the optimisation by default. Without it, code
> may run slightly faster up until the point that it crashes by overflowing the stack :)
>

Turning it on for all modules on the MCit ODASE platform showed a slight slowdown,
and made the compiler crash on a few modules.
I have not investigated further, but my guess is that you do want to turn it on for most modules,
but discovering which modules is painful...

Max.