[Wien] Help

Tue Jun 26 03:01:48 CEST 2018

Dear Gavin Abo
Thank you very much for your help. I am sorry for my late reply, I was quite busy these days. I will try to apply one of those patches and see what happens. 

Regarding the account, I would like to have several remote users each working on one calculation at a time, since it is just a laptop and I am aware of its computing limitations. As of now this is the first time I am installing Wien2k, but I am considering installing it on a more powerful station as you are suggesting. So far I have two accounts for two users (admin and a student). I created the other account and run w2web for this new user from its account which generated a new port for this user. In this way, this user has its own port with username and password and saves his/her own cases in his/her corresponding directory. I'll keep you posted once I solve the problem with x lapw1 -band.
Best regards

Israel

    On Thursday, June 21, 2018, 11:17:07 PM GMT-6, Gavin Abo <gsabo at crimson.ua.edu> wrote:  

That is due to a known bug in WIEN2k 17.1 [https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg17218.html ].  It can be quite the effort to apply the fixes to WIEN2k 17.1 that are mentioned in the mailing list (such as those mentioned athttps://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg17514.html ,https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg17448.html , and https://github.com/gsabo/WIEN2k-Patches/tree/master/17.1 ).  WIEN2k_18 is expected to be released soon [https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg17556.html ].  So, you may want to wait and use that.

Regarding the w2web port, it depends on what you need.  If each user should not be messing with each others calculation files, then the new port for each user sounds like the better option to me.  If each user all need to be working with the same calculation, you could possibly create just one user account dedicated just for WIEN2k and all users of the computer could access that Linux account with the same username and password, then all users have access to start w2web using one port with the same w2web username and password.  If each user does need separate accounts, then it depends on who should have control of starting w2web.  If you install as root, then only root should be able to start w2web.  If installed in user X's account, then usually user Y cannot start w2web, unless you setup file permissions to give user Y access to the files in user X's account.  The w2web can be setup so that it is only accessible when you sit in front of the computer at the keyboard (using localhost) or it be setup so that is accessible anywhere in the world (using an ip address) if there are no blocking firewalls.  So any user should be able to use the same w2web port locally or remotely, they just have to use the same w2web username and password while their Linux account access username and password are different.  So in theory, there are many possibilities for configuring w2web for multiple users.

However, WIEN2k calculations can be quite demanding when it comes to hardware resources.  It looks like you have a single desktop (or single node) computer.  An i7 processor has like 4-6 cores.  For small cells, maybe it could handle a few calculation by multiple users.  When you get to medium size cells, that hardware might only be enough for one single user.  You get to large cell calculations, the calculation likely becomes not feasible or not possible without using a multiple node cluster (multiple computers connect with a GB switch [https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg14035.html ] or a rack server (for example, the Alabama Supercomputer Center's SGI UV has 268 cores! [ https://www.asc.edu/hpc/services/hardware ]).  I thought I saw on the Internet some high performance computing (HPC) clusters offering free core hours, but I don't have a list of them.  For example, the Sabalcore HPC currently offers 1000 core hours for free:

http://www.sabalcore.com/hpc-in-the-cloud-for-academics/

In addition to a cluster having more hardware resources (CPUs, hard drives, RAM modules, etc.) to handle calculations by multiple users, they also have special software (a queuing system) for managing the calculations of multiple users.  While it is possible to use w2web with a cluster [https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg01658.html ], typically I haven't seen w2web used with them.  One reason for that might be that it may add a security vulnerability point [https://security.stackexchange.com/questions/178772/what-are-the-possible-ways-to-exploit-a-login-page ].  Though, the main reason is likely because user's come to prefer the convenience and control of using their native job script [ http://susi.theochem.tuwien.ac.at/reg_user/faq/pbs.html ].

Another possible issue with multiple users on your own computer may be that only one user can be logged on locally at a time unless you have it setup so that multiple users can access it using ssh [ https://help.ubuntu.com/lts/serverguide/openssh-server.html ].  An advantage of using an HPC cluster is that there is usually a specialist [https://www.mail-archive.com/wien@zeus.theochem.tuwien.ac.at/msg17218.html ] who takes care of the ssh setup, manages the system so that you don't have to, and helps you to use it.  I would recommend using an HPC cluster for WIEN2k because of that and also because I suspect small cells have been studied to death by researchers such that you may be left with unstudied large cells.  Yes, the possible drawback of fights over computing time on the HPC cluster at your local university, company, and/or computing center.  The search for a collaborator to use theirs.  Been there and had some experience with that.  

Hopefully that helps and good luck.

 On 6/21/2018 2:57 PM, Sign In Alert wrote:

      Good day 
   I hope anyone can help me with the following problems. I am working with gfortran installed on linux mint 18.3, (16 GB RAM, 260 GB disk space, intel i7, 2.7 GHz) wien2k 17.1. 

  I just installed wien2k and it seems that the installation went well. So I decided to test the software reproducing the example from the wien2k userguide about TiC. I followed all the steps as indicated, the properties for the  DOS, electron charge and X-ray analysis worked well but when I tried the band structured of TiC the plot was not shown properly. According to Dr. Blaha I did not generate the k-mesh or did not executed x lapw1- band (which I did).  After generating the file k-band_list I executed the x lapw1 -band. But I hadn't noticed an error that reads:    At line 75 of file modules_tmp_.F (unit = 5, file = 'israelperez.in1c')
Fortran runtime error: End of file
0.0u 0.0s 0:00.00 0.0% 0+0k 0+0io 0pf+0w
error: command   /home/israelperez/Apps/Wien2k/lapw1c lapw1.def   failed
  I have no idea what this error is about. I am attaching the corresponding files for reference. The executable lapwc and lapw1.def exist in the Wien2k directory but  israelperez.in1c were created in a different directory (i.e. israelperez, the home directory) what can I do?

  Another problem is that I created another user account (where wien2k is isntalled) and run userconfig_lapw1 for this account. My question here is: should I run w2web and generate a new port for each new user after executing  userconfig_lapw1? This is what I actually did, as of now I am using one port for the admin and another port for the new user; is this ok or there is a way to use the same port for all users?

  I would appreciate any comments you may have. 

  Best regards

  Israel

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