Hi Bernhard,

InterpreterPlugin is part of the VMMaker package, so you would need to be
working in an image with VMMaker loaded (maybe one of the prepared image
from Eliot's site).

I should have checked my own notes before replying - I cannot explain the
reason for this, but it seems that the readdir() primitives no longer
provided any performance benefit when I tested them a couple of years ago.

Here is what I wrote in the summary on
http://www.squeaksource.com/DirectoryPlugin:

Performance characteristics have changed significantly since Squeak circa
2003. The readdir() primitives no longer provide any benefit, but the file
testing primitives still yield a couple orders of magnitude improvement
for some functions.


So ... I guess that some additional profiling would be in order.

Dave


> Hi Dave,
>
> Thanks for the answer. I guess I would need to build the latest version of
> the plugin myself, right? (I am on macOS Sierra.)
>
> I could load DirectoryPlugin. However,
> VMConstruction-Plugins-DirectoryPlugin needs InterpreterPlugin available.
>
> Bernhard
>
>> Am 17.10.2016 um 19:56 schrieb David T. Lewis <lewis at mail.msen.com>:
>>
>> It is probably far too bit-rotted to be of any use now, but here is what
>> I
>> came up with 15 years ago to improve this:
>>
>>  http://wiki.squeak.org/squeak/2274
>>
>> I did briefly look at this again a couple of years ago, and put the
>> updates on SqueakSource. But I think I found that the directory
>> primitives
>> are nowhere near as big a win now as they were 15 years ago.
>> Nevertheless
>> it may still be of some interest.
>>
>> Dave
>>
>>> Dear Squeakers,
>>>
>>> I want to count files with a certain extension in a folder recursively.
>>> Here is the code I use:
>>>
>>> | dir count runtime |
>>> count := 0.
>>> dir := FileDirectory on:
>>> '/Users/bernhard/Library/Mail/V4/D77E3582-7EBE-4B5A-BFE0-E30BF6AE995F/Smalltalk.mbox/Squeak.mbox'.
>>> runtime := Time millisecondsToRun: [
>>> 	dir directoryTreeDo: [:each |
>>> 		(each last name endsWith: '.emlx') ifTrue: [count := count + 1]]].
>>> {count. runtime}. #(289747 66109)
>>>
>>> As you can see it finds 289.747 files and it takes about 66 seconds. Is
>>> there any faster way to do this given the current VM primitives?
>>>
>>> The reason I ask is that the equivalent Python code takes between 1.5
>>> and
>>> 6 seconds. :-/
>>>
>>> #!/usr/local/bin/python3
>>> import os
>>> import time
>>>
>>> path =
>>> '/Users/bernhard/Library/Mail/V4/D77E3582-7EBE-4B5A-BFE0-E30BF6AE995F/Smalltalk.mbox/Squeak.mbox'
>>>
>>> print(path)
>>>
>>> start = time.time()
>>> emlx = 0
>>> for dirpath, dirnames, filenames in os.walk(path):
>>>    for filename in filenames:
>>>        if filename.endswith('.emlx'):
>>>            emlx += 1
>>>
>>> runtime = time.time() - start
>>>
>>> print(emlx, runtime)
>>>
>>> It seems to have to do with an optimized os.scandir() function,
>>> described
>>> here: https://www.python.org/dev/peps/pep-0471/
>>>
>>> Cheers,
>>> Bernhard
>>>
>>>
>>>
>>
>>
>>
>
>