Re: edm, Fedora 25, and Wayland

[Luca Cavalli <LCavalli@cgspace.it>]

Hi,

not sure it is your case, but with MEDM I had to install a missing package:

xorg-x11-xfs

Containing the font server not installed by default on new fodoras

Then added a directory to /usr/share/X11/fonts/ with name epics and put font.alias in that folder.

Created a link in /etc/X11/fontpath.d/ pointing to this new folder

And then start the font service with:

sudo systemctl start xfs

or "enable" if you want it to start at each reboot.

To list all MEDM fonts:

xlsfonts | grep widget

I hope for edm is the same.

Cheers,

Luca

On Mon, 2017-02-06 at 10:30 +0000, Pierrick Hanlet wrote:

> Hi John,
> Attached is the output of the xset command that you requested; the 
> xlsfonts output was too large, so it violated the email size limit to 
> tech-talk.
> It appears, from the "xset -q" command, that it's looking in 
> /etc/X11/fontpath.d rather than /etc/X11/xorg.conf.d, but that's only my 
> suspicion, as
> I'm weak in sysadmin tasks.
>
> There's an oddity about Wayland which I've read which is that it's not 
> mastered allowing one to su to another user on the same machine and 
> display a
> window. As Andrew pointed out, Fedora will continue to support X with 
> XWayland, but I've not tried that yet.  If I can get the fonts to work, 
> perhaps
> edm will work as advertised, so I don't want to muddy the waters just yet.
>
> Thanks,
> Pierrick
>
>
> On 02/03/2017 03:39 PM, Sinclair, John William wrote:
> > Hi Pierrick,
> >
> > In response to the display server question, I am not sure. If you have a network of workstations, can you login to any one and run xclock having the output displayed to any other one? If so, you can do this with edm and I would guess (but am not certain) that edm should be able to utilize multiple displays. My qt version of edm (not production code, just an experiment in porting to qt) does not support multiple displays and I did not see support for this in the qt API so there is some chance that Wayland does not behave properly when one process attempts to use multiple displays.
> >
> > I did experiment with fedora 23 using Wayland but, at least in the past, fedora 23 could be reconfigured to use X. Is this still the case with fedora 25?
> >
> > Another Wayland-related observation and question:
> >
> > One of my fedora 23 experiments was to investigate Wayland performance since it seems to be targeted at running high performance games on linux
> >
> >   I opened a local display session to the Wayland-based system and ran firefox in one window and top in another. While monitoring firefox cpu usage in top, I pointed firefox to a site that filled the window with lots of graphics and then resized the window back and forth rapidly. Firefox could only utilize about 50% of the cpu and the result was a very choppy and jumpy redisplay of the image.
> >
> > I then repeated this test with an X-based system. X could use > 90% of the cpu resulting in behavior that looked much smoother.
> >
> > The question is, has this performance issue been fixed in the version of Wayland included in the fedora 25 distro?
> >
> > -------------
> >
> > I am surprised you are having mysterious problems with fonts. What output does xlsfonts produce and what is associated with "Font Path" when you do xset -q?
> >
> > Thanks,
> > John
> >
> > -----Original Message-----
> > From: Pierrick Hanlet [mailto:hanlet@fnal.gov]
> > Sent: Friday, February 03, 2017 4:51 AM
> > To: Sinclair, John William; tech-talk@aps.anl.gov
> > Subject: edm, Fedora 25, and Wayland
> >
> > Hi John,
> > I've changed the subject line of this thread to reflect the new issue (the edm compilation is solved, thank you).
> >
> > The fonts problem may be deeper.  Fedora 25 has, by default uses Wayland, instead of X, for its display server.
> > If edm is tied to X, do I/can I run 2 display servers?
> > Thank you,
> > Pierrick
> >
> >
> > On 02/02/2017 09:54 PM, Sinclair, John William wrote:
> > > become root...
> > >
> > > dnf install xorg-x11-fonts-75dpi
> > >
> > > dnf install xorg-x11-fonts-ISO8859-1-75dpi
> > >
> > > Use the version 5 font file.
> > >
> > > Version 3 is described in https://ics-web.sns.ornl.gov/edm/eum.html#id2503129 .
> > >
> > > Version 4 adds substitutions for all instances of a font spec. See https://ics-web.sns.ornl.gov/edm/log/show.php?mon=Apr&theDay=16&year=2012 .
> > >
> > > Version 5 adds substitutions for single instances of a font spec. See https://ics-web.sns.ornl.gov/edm/log/show.php?mon=Jul&theDay=22&year=2013 .
> > >
> > > Before Redhat released the liberation fonts, the scalable Helvetica font that shipped with their distribution rendered 16 point fonts smaller than it should have been. Liberation san-serif 16 point would not fit in objects that were sized based on the contents of text.  Version 5 allows a font rendering adjustment that can be used as a temporary fix (until some poor developer takes the time to change 10000 screens).
> > >
> > > John
> > >
> > >
> > > -----Original Message-----
> > > From: Pierrick Hanlet [mailto:hanlet@fnal.gov]
> > > Sent: Thursday, February 02, 2017 3:38 PM
> > > To: Sinclair, John William; tech-talk@aps.anl.gov
> > > Subject: Re: problem compiling edm
> > >
> > > Thank you John,
> > > That did the trick.
> > >
> > > Now I need to revisit the fonts issue.  There's an old message of adding Fonts.conf to /etc/X11/xorg.conf, but that doesn't appear to work with this newer os.
> > > Perhaps the problem is that I've not been able to find the "unscaled"
> > > fonts.  Any ideas?
> > > Thanks again,
> > > Pierrick
> > >
> > > On 02/02/2017 04:12 PM, Sinclair, John William wrote:
> > > > I believe I added the following to the makefile locally for newer versions of gcc:
> > > >
> > > >      USR_CXXFLAGS += -fpermissive -Wno-narrowing -Wno-write-strings
> > > > -Wno-unused-but-set-variable
> > > >
> > > > John Sinclair
> > > >
> > > > -----Original Message-----
> > > > From: tech-talk-bounces@aps.anl.gov
> > > > [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Pierrick Hanlet
> > > > Sent: Thursday, February 02, 2017 9:16 AM
> > > > To: tech-talk@aps.anl.gov
> > > > Subject: problem compiling edm
> > > >
> > > > I've a new pc on which I'm running Fedora release 25.  I'm using base 3.15.5.
> > > >
> > > > I'm attempting to build edm, but whilst attempting to compile, I get:
> > > >
> > > > make[2]: Entering directory
> > > > '/home/epics/epicsDEV/extensions/src/edm/lib/O.linux-x86_64'
> > > > /usr/bin/g++  -D_GNU_SOURCE -D_DEFAULT_SOURCE -D_X86_64_  -DUNIX
> > > > -Dlinux     -O3 -g   -Wall -DSINGLE_THREADED=1 -D__epics__=1
> > > > -mtune=generic     -m64 -fPIC -I. -I../O.Common -I. -I. -I..
> > > > -I../../../../include/edm/compiler/gcc
> > > > -I../../../../include/edm/os/Linux -I../../../../include/edm
> > > > -I/home/epics/epicsDEV/base/include/compiler/gcc
> > > > -I/home/epics/epicsDEV/base/include/os/Linux
> > > > -I/home/epics/epicsDEV/base/include
> > > > -I/home/epics/epicsDEV/extensions/include        -I../../util
> > > > -I../../lib -I/usr/include -I/usr/include    -c ../cursor.cc
> > > > ../cursor.cc: In member function ‘void cursorClass::create(Display*, Window, Colormap)’:
> > > > ../cursor.cc:82:50: error: narrowing conversion of ‘224’ from ‘int’ to ‘char’ inside { } [-Wnarrowing]
> > > >         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
> > > >                                                       ^
> > > > ../cursor.cc:82:50: error: narrowing conversion of ‘224’ from ‘int’ to
> > > > ‘char’ inside { } [-Wnarrowing]
> > > > ../cursor.cc:82:50: error: narrowing conversion of ‘224’ from ‘int’ to ‘char’ inside { } [-Wnarrowing] and many more lines of the same.
> > > >
> > > > I can't find this problem in tech-talk, nor with a web search. Has anyone run into this problem and if so, how did you resolve it?
> > > > Many thanks,
> > > > Pierrick

 

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