Making "read from file" less blocky.

dsc at swcp.com dsc at swcp.com
Sun Aug 4 16:43:06 EDT 2019


Even more "really out there" of the "really out there".

Don't read in the file.  

Access portions JIT, that is, lazily.

Create a function that pulls in segments of the file. Kinda like this:

	function segmentOfFile pStartIndex, pEndIndex, pThisFile 

Or this:

	function segmentOfCurrentFile pStartIndex, pEndIndex

Dar

> On Aug 4, 2019, at 1:22 PM, dsc--- via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> More "really out there".
> 
> I like the idea of trying to speed up an upfront foreground load. Something simple like this:
> 
> put blah-plah into IntoThisVariable.
> 
> where blah-blah is nana-nana or decompress( nana-nana ) 
> where nana-nana is one of these:
> 	URL ("binfile:" & ThisFile)
> 	shell("cat " & ThisFile)
> 
> Function decompress() makes two RAM hits and requires control over the loaded files. 
> 
> 
>> On Aug 4, 2019, at 12:47 PM, Dar Scott Consulting via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> I love "really out there".  I wanna play.
>> 
>> At the start of any solution, try this. It might speed up any method but would take some time at the start.
>> 
>> get shell( "cat " & ThisFile & " > dev/null" )
>> 
>> I think that is likely to pre-load the system file buffers for you. 
>> 
>> If one is feeling adventurous, one can try open process (cat) to avoid the wait; it will probably move through the file faster than the script and sectors will already be loaded when you ask for them.
>> 
>> Dar
>> 
>>> On Aug 4, 2019, at 7:59 AM, Alex Tweedly via use-livecode <use-livecode at lists.runrev.com> wrote:
>>> 
>>> OK, here's a "really out there" suggestion ....
>>> 
>>> 1. Run a local web server  to serve files (locally only).
>>> 
>>>    Can be done various ways, including (easily) via LC and the httpd library,
>>> 
>>>       (build that server as a standalone and have it running - started from your app if need be...)
>>> 
>>> 2. in your stack, just do
>>> 
>>> load url ("http://localhost:8080/myfilename") with message "mycallback"
>>> 
>>> and handle the file once it has been read in the "mycallback" handler
>>> 
>>> -- Alex.
>>> 
>>> 
>>> On 04/08/2019 01:56, Tom Glod via use-livecode wrote:
>>>> Hey folks,
>>>> 
>>>> I'm having trouble finding a combination of settings that allows my file
>>>> loading  to seem to happen in the background.
>>>> 
>>>> repeat while read_result is not "eof"
>>>>        read from file ThisFile for (1024 * 1000) bytes
>>>>        put the result into read_result
>>>>        put it after IntoThisVariable
>>>>        add length(it) to amount_read
>>>>        TSTProgress amount_read,ExpectedSize,"%","Loading File ..."
>>>> (Progress Indicator Handler)
>>>>        wait 10 milliseconds with messages
>>>>     end repeat
>>>> 
>>>> no matter what I try, its still sluggish, and it seems like messages are
>>>> still accumilating instead of being processed by the engine.
>>>> 
>>>> Am I missing something?  Normally waiting with messages sufficiently frees
>>>> the engine to allow the UI to remain responsive.
>>>> 
>>>> Thanks,
>>>> 
>>>> Tom
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>> 
>> 
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