| From: | Andrew Crowe |
| Date: | 27 Sep 2001 at 00:44:53 |
| Subject: | Re: [amigactive] Re: JPEGTMP ???????? |
Hi Everybody,
> The whole idea of JPEGTMP is that it is used as temporary storage for
> when there is not enough real memory to decode the image completely.
> So, if you're running low on memory, the JPEG decoder will use disk
buffers
> to swap data into and out of real memory (much like virtual memory
really).
Are you sure? When ever I was on a page with progressive JPEGS on it it
always used to ask for JPEGTMP until I finally got round to assigning it,
and I have plenty of memory so I thought it was always used to just store
temporary decoding information rather then be used as virtual memory.
> > used to hold decoded jpeg information temporarally until it is moved
from
> > the location on disk into memory, so it ends up in RAM anyway.
>
> True, but only small chunks at a time - once it's finished with one chunk,
> the JPEG decoder removes it from memory and loads another from disk.
Surely it still needs a copy of the completly decoded image buffered in
memory anyway though so that it can be converted down from 24 bit to
whatever and displayed on-screen
But then, I didnt write the decoders so for all I know they could require a
lot of extra memory as workspace.
Anyway if you've got plenty of memory keep it in ram as it avoids disk
fragmentation, if not stick it where ever, in the same place you have your
browser cache might be a good idea.
Andrew
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