[squeak-dev] Slow your image to a crawl with this one weird trick!

Marcel Taeumel marcel.taeumel at hpi.de
Fri Aug 23 06:39:36 UTC 2019


Hmm... HierarchyBrowser has a cache in #classList. Browser has no such cache. Browser >> #hierarchicalClassList is slow.

Also, class compilation is so slow because of SmalltalkImage >> #logChange:.

84.7% {13730ms} SmalltalkImage>>logChange:
      84.6% {13718ms} SmalltalkImage>>forceChangesToDisk
            79.6% {12899ms} MultiByteFileStream(StandardFileStream)>>close
             |79.6% {12899ms} MultiByteFileStream(StandardFileStream)>>unregister
           4.9% {798ms} SecurityManager class>>default

Best,
Marcel
Am 22.08.2019 18:45:43 schrieb gettimothy via Squeak-dev <squeak-dev at lists.squeakfoundation.org>:
"Try this one wierd trick"


Object subclass: #Foo

          instanceVariableNames: ''

          classVariableNames: 'PageId PageTitle Lua'

          poolDictionaries: ''

          category: 'Foo-Bar'.


"Open a browser and highlight the Foo-Bar category. Then.."



1 to:3000  do: [:each | | newclassname|

    newclassname := ('FooBar', each asString) asSymbol.

     Foo subclass: newclassname

          instanceVariableNames: ''

          classVariableNames: ''

          poolDictionaries: ''

          category: 'Foo-Bar']



"Your system should slow to a crawl.

Be patient and click off of the 'Foo-Bar' category and the system should free up.


Now open a HierarchyBrowser on Foo

Things will continue to work smoothly.


Conclusion? Something funky with Browser.

"



Foo allSubclasses do: [:each |

Smalltalk removeClassNamed: (each name)

]

Smalltalk removeClassNamed: #Foo

ClassOrganizer removeCategory:'Foo-Bar'


Motivation.


I am on a "import that as a class" kick for SeasideDock and the WikitextParser I am working on.


I am comfortable working with these classes as I have learned to NEVER open certain categories and use the HierarchyBrowser when I need to scan the classes therein.



Thought somebody might be intrigued with the "Why" of this on purely technical grounds. I am not that guy (:



cheers.


t






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