ah, and another small improvement: Last week we realised that we recompile
meta-classes twice with #recompile.
Changing this dropped the time for full recompile from sources on my MacBooAir
from 60 seconds to 50 seconds.
Marcus
> On 29 Jan 2018, at 09:18, Marcus Denker <marcus.den...@inria.fr> wrote:
>
> Right now #embeddSourceInTrailer encoded and decodes every method to utf8.
> This is fairly slow.
>
> We do not need to actually use utf8, the only thing important is that we
> interpret the bits correctly when we decode (wide string or not?).
> As a first step we then can even just utf8 encode the widestrings, there are
> not many in the image.
>
> Benchmark:
> [SystemNavigation default browseMethodsWithSourceString: 'Method source with
> it' matchCase: true] timeToRun.
>
> sources from Disk:
> "0:00:00:02.103" "0:00:00:02.265"
>
> CompiledMethod allInstances do: #embeddSourceInTrailer.
>
> "embedded sources"
> "0:00:00:02.442" "0:00:00:02.924"
>
> embedded after speed improvements (already in Pharo7):
> "0:00:00:01.273" "0:00:00:01.345"
>
> (fun thing a lot of that time is spend in the progress bar... without that
> and not sorting twice, we are at ~0.8 seconds for full image search over all
> source…)
>
> Interesting:
>
> [Smalltalk compiler evaluate: '3+4'] bench
>
> before: "'4,673 per second'"
> after: "'6,008 per second'"
>
> This is because we embedd sources of Doit Methods so we can debug DoIts
> without the need to decompile. After thinking about it,
> I think the embedding for Doit was wrong. As the AST for Doits is transformed
> (return added, temp access via arg for DoItIn:), we
> have to pretty-print the AST, which is not a good idea as eval speed should
> be optimised for.
>
> We just gain temp names, which we can do differently if we really need them.
> -> we should just rely on the decompiler. I wild that change later this week.
>
> Marcus
