[Cuis-dev] Slow performance of UnicodeString>>#asLowercase?

[Andres Valloud]

It looks like roughly 40% of the time is going into linear search.

On 6/18/23 12:40 PM, Nicolás Papagna Maldonado via Cuis-dev wrote:
> Hi folks!
> 
> I'm working on a tool to index source code to perform faster searches.
> While profiling the code that builds the index, I noticed that about 60% 
> of the time spent is in UnicodeString>>#asLowercase.
> 
> It takes about 60% too (8 seconds) of the time spent when running the 
> following experiment, too (see attached screenshot)
> 
> CompiledMethod allInstances
>    do: [ :method | method sourceCode asLowercase ]
>    displayingProgress: 'Indexing...'.
> 
> This experiment was run on Cuis6.0-5797.image.
> VM version is:
> 5.0 5.20220602.1410 Mac OS X built on Jun  2 2022 15:55:29 UTC Compiler: 
> Apple LLVM 12.0.0 (clang-1200.0.32.29) [Production Spur 64-bit x64 VM]
> CoInterpreter VMMaker.oscog-dtl.3185 uuid: 
> 0e7f07b8-eed6-4362-b223-86c98594ddb9 Jun  2 2022
> StackToRegisterMappingCogit VMMaker.oscog-mt.3179 uuid: 
> c6fbcb07-2a19-ed4f-8b40-9c119a70882a Jun  2 2022
> VM: 202206021410 
> runner at Mac-1654183989075.local:work/opensmalltalk-vm/opensmalltalk-vm
> Date: Thu Jun 2 16:10:44 2022 CommitHash: c9fd365
> Plugins: 202206021410 
> runner at Mac-1654183989075.local:work/opensmalltalk-vm/opensmalltalk-vm
> 
> Is there any way to improve its performance?
> 
> Thanks in advance,
> Nico PM
>