Hello,
> <snip/>
> > Interestingly, my installation of mono (from debian sid) doesn't even
> > come with its own libraries AOT'd. I'd have thought that you'd get the
> > best performance by AOT'ing *all* the libraries, including (and
> > especially) the low-level platform ones such as System.dll and
> > System.Xml.dll.
>
> AOT (or pre-JITing) assemblies is not as useful as you'd think. It has
> two primary effects:
>
> - Reduce memory requirements, as memory doesn't need to be allocated
> for the JITed code
> - Decrease startup time, as (again) the JITing doesn't need to be
> done.
Another effect is that you can run the most time consuming
optimizations on those assemblies. For example, using AOT with -O=all
on mcs.exe gives about 15% performance increase:
mono --aot -O=all /usr/bin/mcs.exe
If you also apply this to mscorlib and System, you get another 7-12%.
Useful when you are doing a lot of compilations.
Miguel
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