[Etoys] Rebecca Allen's example intro to XO made into an Etoy JPEG movie

Alan Kay alan.kay at squeakland.org
Thu Oct 12 14:01:08 EDT 2006

That's interesting!




At 10:48 AM 10/12/2006, Yoshiki Ohshima wrote:
>   Alan,
> >   It could be but I'd imagine it is not significant.  I'll measure the
> > raw data throughput on the board later.  They say the read through put
> > on the A-board is something like 2.5MB/sec.  Assuming this ideal
> > bandwidth achieved, the JMV file is about 1.5MB, so half a second is
> > spent on reading over 20 seconds or so play time.
>   From a USB memory in VFAT, it seems to be able to do 13MB/sec or such.
>   And, Linux uses free memory space as file buffer cache (and OLPC
>will have some memory-based filesystem (tmpfs).  If I read a file from
>cached data, Squeak can do over 70MB/sec.
>   Our MPEGPlayer seems to spend so much time on updating sliders and
>buttons and invisible subtitle.  Only about 60% of time seems to be
>spent for decoding (about 30%) and displaying (about 30%).  We could
>do some more optimization.
>-- Yoshiki
>Etoys mailing list
>Etoys at laptop.org

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