Author: Paolo Redaelli

rdiff-backup

Posted on by Paolo Redaelli

rdiff-backup rdiff-backup

Reverse differential backup tool, over a network or locally.

Comfortably installable on your Debian/Ubuntu with sudo apt install rdiff-backup and on Fedora with sudo dnf install rdiff-backup

Avoid gotowebinar.com

Posted on by Paolo Redaelli
Just avoit them

In these times of lock-down many conference and “webinar” solutions have blossomed. Some are based on free-as-in-freedom software, most are using widespread standard such as WebRTC.

A small number of them are either proprietary software or use non-standard implementation of standard.

Using Debian, Ubuntu and Fedora workstations I’ve been able to work with almost all of them.

Today I wanted to follow a webinar organized by the italian branch of BASF on fiber-reinforced concrete pavings. It uses gotowebinar.com. I put it simply:

Avoid gotowebinar.com. There are better alternatives

Lo spazio non è curvo. E’ un fluido dilatante. E i conti tornano. Un passo verso la tanto attesa gravità quantistica? | Reccom Magazine

Posted on by Paolo Redaelli

Il preside che sfida Einstein: il primo a derivare, al di fuori della relatività generale, l’equazione del genio della fisica che spiega la precessione di Mercurio e la “danza” delle stelle.

Source: Lo spazio non è curvo. E’ un fluido dilatante. E i conti tornano. Un passo verso la tanto attesa gravità quantistica? | Reccom Magazine

Little notes

Posted on by Paolo Redaelli

Just a little note to myself, to start salome on a severly hacked and messed up workstation like mine:

paolo@rigel:~/salome_meca/appli_V2019.0.3_universal$ /home/paolo/salome_meca/appli_V2019.0.3_universal/salome 
runSalome running on rigel
Searching for a free port for naming service: 2815 - OK
Searching Naming Service  + found in 0.1 seconds 
Searching /Kernel/Session in Naming Service  ++++libGL error: MESA-LOADER: failed to open radeonsi (search paths /usr/lib/i386-linux-gnu/dri:/usr/lib/x86_64-linux-gnu/dri)
libGL error: failed to load driver: radeonsi
libGL error: MESA-LOADER: failed to open radeonsi (search paths /usr/lib/i386-linux-gnu/dri:/usr/lib/x86_64-linux-gnu/dri)
libGL error: failed to load driver: radeonsi
libGL error: MESA-LOADER: failed to open swrast (search paths /usr/lib/i386-linux-gnu/dri:/usr/lib/x86_64-linux-gnu/dri)
libGL error: failed to load driver: swrast
Warning: this type (Study,objref) already exists, it will be ignored.
Warning: this type (SALOME_MED/MEDCouplingFieldDoubleCorbaInterface,objref) already exists, it will be ignored.
+Traceback (most recent call last):
  File "/home/paolo/salome_meca/V2019.0.3_universal/modules/KERNEL_V9_3_0/bin/salome/orbmodule.py", line 172, in waitNSPID
    os.kill(thePID,0)
ProcessLookupError: [Errno 3] No such process

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/paolo/salome_meca/appli_V2019.0.3_universal/bin/salome/runSalome.py", line 633, in useSalome
    clt = startSalome(args, modules_list, modules_root_dir)
  File "/home/paolo/salome_meca/appli_V2019.0.3_universal/bin/salome/runSalome.py", line 578, in startSalome
    session=clt.waitNSPID("/Kernel/Session",mySessionServ.PID,SALOME.Session)
  File "/home/paolo/salome_meca/V2019.0.3_universal/modules/KERNEL_V9_3_0/bin/salome/orbmodule.py", line 174, in waitNSPID
    raise RuntimeError("Process %d for %s not found" % (thePID,theName))
RuntimeError: Process 460617 for /Kernel/Session not found


--- Error during Salome launch ---

I can’t recall where I found the solution, bit it is as simple as:

alias salome='LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.28 /home/paolo/salome_meca/appli_V2019.0.3_universal/salome'

I found it on https://code-aster.org/forum2/viewtopic.php?id=23552