[ncl-talk] ps figure can not work

[朱学明]

Dear Rick,
      Thank you for your replying.
       I have tried with the latest version of NCL 6.6.2, the same problem is still there. But accidentally, I tried to run the same script in the ROOT account, it works well. Originally, I had run it in my own user account. It looks like very weird.

      Best regards.
      

2019-09-04 


Xueming Zhu 朱学明
Key Laboratory of Research on Marine Hazards Forecasting (LoMF), SOA
National Marine Environmental Forecasting Center (NMEFC)
No.8, Dahuisi Road, Haidian District, Beijing, 100081
People's Republic of China
Tel:+86-10-82481923



发件人：Rick Brownrigg <brownrig at ucar.edu>
发送时间：2019-09-03 23:31
主题：Re: Re: Re: [ncl-talk] ps figure can not work
收件人："朱学明"<557xiaozhu at 163.com>
抄送："ncl-talk at ucar.edu USERS"<ncl-talk at ucar.edu>

Hi,


I'm not sure what to tell you. The fact that cairo does not appear in the output of ldd indicates its statically linked, so not much point in you building it. And clearly something has changed during the OS  upgrade, but what?


I would note that the latest version of NCL is 6.6.2 -- perhaps you might install it in a private directory, and if it works for you, persuade the sysadmins to make it more generally available.


I wish I had a better answer...


Rick




On Sun, Sep 1, 2019 at 6:47 PM 朱学明 <557xiaozhu at 163.com> wrote:

Thanks Rick.
I have tried     ldd `which ncl`  on the login node and caculate node seperately. Please see the attachments.

It looks like both of them have not linked with 'libcairo'. Do you think I need to build it?
Thanks for your kindly answers.


2019-09-02 


Xueming Zhu 朱学明
Key Laboratory of Research on Marine Hazards Forecasting (LoMF), SOA
National Marine Environmental Forecasting Center (NMEFC)
No.8, Dahuisi Road, Haidian District, Beijing, 100081
People's Republic of China
Tel:+86-10-82481923



发件人：Rick Brownrigg <brownrig at ucar.edu>
发送时间：2019-08-31 22:13
主题：Re: Re: [ncl-talk] ps figure can not work
收件人："朱学明"<557xiaozhu at 163.com>
抄送："ncl-talk at ucar.edu USERS"<ncl-talk at ucar.edu>

OK, that's interesting. Ultimately it would be the cairographics (libcairo) that's responsible for drawing to the "ps" workstation. Fixing the problem is likely to be rather tricky:


i) its hard to see how a simple kernel upgrade could have affected anything; was it perhaps a complete Linux OS upgrade  (which would likely install newer versions of libraries and other software)?

ii) is your NCL binary dynamically linked against cairo?  try:
    ldd `which ncl`
and look to see *if* cairo is showing up in the list, and note where it is coming from.
iii) its also hard to imagine the cairo library would be built without PS support -- its possible, but one has to be very deliberate. But this is all I  can think of that might be the source of the problem. I should think NCL would give you a meaningful error message, but...?  If cairo is dynamically liked, you could possibly build it yourself (it requires building pixman too), put it is a directory in your own workspace, and setting this environment variable to force the system to look at that location first:


  export LD_LIBRARY_PATH=/....your-cairo-dir:$LD_LIBRARY_PATH


That seems like a lot of work, and I'm not certain it would fix the problem (maybe your sysadmin could do this)


If you can live with the oldps driver, you can set this environment variable that will override the "ps" workstation with "oldps". Note that oldps does not support translucent colors and is possibly limited to 256 colors (I can't recall)



   export NCARG_OLD_PS=true


Hope that helps and good luck!


Rick






On Sat, Aug 31, 2019 at 7:10 AM 朱学明 <557xiaozhu at 163.com> wrote:

Dear Rick, 
     Thanks for your kindly answer.
     I have tried with "oldps". It works well. In this case, how should I fix my "ps" case's problem, please? Do you know which library should lead to this problem?

     Thanks.

2019-08-31 


Xueming Zhu 朱学明
Key Laboratory of Research on Marine Hazards Forecasting (LoMF), SOA
National Marine Environmental Forecasting Center (NMEFC)
No.8, Dahuisi Road, Haidian District, Beijing, 100081
People's Republic of China
Tel:+86-10-82481923



发件人：Rick Brownrigg <brownrig at ucar.edu>
发送时间：2019-08-30 11:33
主题：Re: [ncl-talk] ps figure can not work
收件人："朱学明"<557xiaozhu at 163.com>
抄送："ncl-talk at ucar.edu USERS"<ncl-talk at ucar.edu>

Hi,


I do not have a good explanation as to why that is happening. But I wonder if you would try an experiment with me -- in the gsn_open_wks() statement, try using "oldps" instead of just "ps", and let me know happens.  "oldps" (an unfortunate name that I'm responsible for) refers to the legacy postscript driver, vs. the current default drivers based upon cairographics.  Postscript support is optional in cairographics, but one has to go to lengths to disable it. I can't think of any other explanation however...


Rick




On Thu, Aug 29, 2019 at 8:28 PM 朱学明 via ncl-talk <ncl-talk at ucar.edu> wrote:

Dear all,
      
       I am trying to use NCL V6.5.0 on the computer nodes of our super-computer. It can work when I set the figure type as "png" or "pdf". But it can not work with "ps". It can output a zero size file named "aaa.ps", and without any error message. However, the same script can work well on the login node with any figure type, "ps", "png", "pdf". 
       Initially, it also can work well with "ps" type on the computer node in May. It is side that the super-computer administrator had upgraded the kernel of Linux system in June. 
       Anybody can give me any suggestion how to fix my problem? Or which software maybe changed when upgrading the Linux system, then affecting the generation of the figure of "ps" type?

      Thanks and regards.  


2019-08-30



Xueming Zhu 朱学明
Key Laboratory of Research on Marine Hazards Forecasting (LoMF), SOA
National Marine Environmental Forecasting Center (NMEFC)
No.8, Dahuisi Road, Haidian District, Beijing, 100081
People's Republic of China
Tel:+86-10-82481923
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