[Pharo-users] Creation form from PNG file very slow on Pharo 4 and 5

Dimitris Chloupis kilon.alios at gmail.com
Tue Jan 19 08:44:08 EST 2016


thanks ben that indeed get the cairo 32 bit version but there must be a
version mismatch because now pharo complains
"Error:Could not  find accessor for variable named "aCairoSurfaceHandle" "

On Tue, Jan 19, 2016 at 3:30 PM Ben Coman <btc at openinworld.com> wrote:

> $ apt-cache search cairo | grep cairo | less
> shows... libcairo2 - Cairo 2D vector graphics library
>
> so following the pattern for Debian here...
> http://pharo.org/gnu-linux-installation
>
> I presume...
> $ sudo dpkg --add-architecture i386
> $ sudo apt-get update
> $ sudo apt-get install  libcairo2:i386
>
> ...but haven't tried this since I'm using 32-bit Debian.
>
> cheers -ben
>
> On Tue, Jan 19, 2016 at 9:02 PM, Dimitris Chloupis
> <kilon.alios at gmail.com> wrote:
> > ah yes it needs the 32 bit libs of cairo, yeah good luck with that, cant
> > wait till we finally support 64 bit, but far my most needed feature of
> > pharo. No idea how to find 32 bit lib of cairo, google returns nothing
> > meaningful, download page of cairo website mentions nothing.
> >
> > On Tue, Jan 19, 2016 at 2:52 PM Dimitris Chloupis <kilon.alios at gmail.com
> >
> > wrote:
> >>
> >> does not work for me on ubuntu it keeps saying that "cannot locate cairo
> >> library" even though its installed via
> >>
> >> sudo apt-get install libcairo2-dev
> >>
> >> By the way just for the fun, I will make a benchmark comparison betweem
> >> PNG loader in pharo and SDL in C to see what is the speed difference and
> >> dust off my C skills.
> >>
> >> On Tue, Jan 19, 2016 at 2:22 PM Esteban Lorenzano <estebanlm at gmail.com>
> >> wrote:
> >>>
> >>> Yesterday I tested creating PNGs from disk using Athens:
> >>>
> >>> [(AthensCairoSurface
> >>>         createFromFile: '/Users/esteban/Dev/Pharo/pharo50/Lenna.png'
> >>>         ifFailed: [ ])
> >>>         asForm] bench.
> >>>
> >>> That gave me 46k/s … (455k image) which IMO is pretty reasonable :)
> >>>
> >>> Esteban
> >>>
> >>> > On 19 Jan 2016, at 12:34, Sven Van Caekenberghe <sven at stfx.eu>
> wrote:
> >>> >
> >>> >
> >>> >> On 19 Jan 2016, at 12:29, PBKResearch <peter at pbkresearch.co.uk>
> wrote:
> >>> >>
> >>> >> Denis
> >>> >>
> >>> >> Very interesting. It would be more interesting if you could save
> your
> >>> >> test image as a .png file, and then include reading with
> PNGReadWriter in
> >>> >> your comparison. This would help to confirm or refute the original
> point
> >>> >> made by Dimitris, that reading from .png is particularly slow.
> >>> >
> >>> > Check the original thread/case, it is slow. Not *very* slow, but
> slower
> >>> > than the plugin based JPEG reader. That is what we eventually need,
> a plugin
> >>> > base PNG reader.
> >>> >
> >>> >> Peter Kenny
> >>> >>
> >>> >> From: Pharo-users [mailto:pharo-users-bounces at lists.pharo.org] On
> >>> >> Behalf Of Denis Kudriashov
> >>> >> Sent: 19 January 2016 10:59
> >>> >> To: Any question about pharo is welcome <
> pharo-users at lists.pharo.org>
> >>> >> Subject: Re: [Pharo-users] Creation form from PNG file very slow on
> >>> >> Pharo 4 and 5
> >>> >>
> >>> >>
> >>> >> 2016-01-19 11:34 GMT+01:00 Dimitris Chloupis <kilon.alios at gmail.com
> >:
> >>> >>> most likely fuel, since it stores your live object as is.
> >>> >>>
> >>> >>> I like fuel but the fact that I may be limited by incompatible
> >>> >>> versions is a game stopper for me. I am ok with new version between
> >>> >>> incompatible with old one but there must be some backward
> compatibility to
> >>> >>> any format I use. Or else I end up worrying about things I should
> not be
> >>> >>> worrying about.
> >>> >>
> >>> >> You are right. I perform little experiment. Fuel reading is 60%
> faster
> >>> >> than BMP:
> >>> >>
> >>> >> Smalltalk garbageCollect; garbageCollect.
> >>> >> r1 := [FileLocator imageDirectory / 'test.bmp' readStreamDo: [ :s |
> >>> >>            s binary.
> >>> >> fromBMP := BMPReadWriter formFromStream: s]] benchFor: 2 seconds.
> >>> >>
> >>> >> Smalltalk garbageCollect; garbageCollect.
> >>> >> r2:=[FileLocator imageDirectory / 'test.fuel' readStreamDo: [ :s |
> >>> >>            s binary.
> >>> >> fromFuel := (FLMaterializer newDefault materializeFrom: s) root]]
> >>> >> benchFor: 2 seconds.
> >>> >>
> >>> >> { r1. r2 } "an Array(a BenchmarkResult(2,199 iterations in 2
> seconds 2
> >>> >> milliseconds. 1,098 per second) a BenchmarkResult(5,728 iterations
> in 2
> >>> >> seconds 3 milliseconds. 2,860 per second))"
> >>> >
> >>> >
> >>>
> >>>
> >
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.pharo.org/pipermail/pharo-users_lists.pharo.org/attachments/20160119/9ca4cda4/attachment.html>


More information about the Pharo-users mailing list