[ncl-talk] open more than 15 workstations at one time

[Zhifeng Yang]

Hi Dave,

Thank you so much for your excellent reply. I will follow your instruction
to modify my script for multiple processes. Thank you again, Zhifeng

On Fri, Jul 3, 2015 at 6:34 PM, Dave Allured - NOAA Affiliate <
dave.allured at noaa.gov> wrote:

> Zhifeng,
>
> Please include the ncl-talk address in all replies.
>
> On Fri, Jul 3, 2015 at 3:57 PM, Zhifeng Yang <yangzf01 at gmail.com> wrote:
>
>> Hi Dave,
>> What's the meaning of running multiple NCL processes?
>>
>
> Start several copies of NCL running in the background, from your shell
> command window, or from a shell script.  Or you can use the NCL "system"
> command to start background processes directly from an NCL main program.
>
> You run a process in the background by putting an ampersand "&" at the end
> of the command line, at least on Linux and Unix-like systems.  See your
> shell documentation.  For example:
>
>     ncl plot.ncl var=\"precip\" time=6 &
>     ncl plot.ncl var=\"temp\" time=6 &
>     ncl plot.ncl var=\"uwind\" time=6 &
>     ncl plot.ncl var=\"vwind\" time=6 &
>
> In this example, the variables "var" and "time" would tell each copy of
> the program which variable and which time step to plot.
>
> Actually, the reason that I need to open more than 15 workstations is
>> plotting more than 15 variables at the same time and each variable has tons
>> of images. I need to distinguish the plot names based on variable names.
>>
>
> Multiple background processes will do this.  As you said, each process can
> have up to 15 workstations open.  That means 15 X11 windows open, each
> displaying one plot, all on the same computer desktop.
>
> Actually, it would be simpler to open only one workstation and make one
> plot from each process, and just have a lot of separate NCL processes
> running at the same time.
>
> Do you know any hint on how to investigate the internals of NCL and
>> support libs?
>>
>
> NCL and most of its support libraries are open source software.  That
> means you can find and download free copies of the source code, and study
> how they works.  Please see the NCL info pages on downloading and
> installation, for more details.
>
> --Dave
>
>
>
>> On Fri, Jul 3, 2015 at 5:45 PM, Dave Allured - NOAA Affiliate <
>> dave.allured at noaa.gov> wrote:
>>
>>> Zhifeng,
>>>
>>> The easiest way would be to run multiple NCL processes at the same
>>> time.  Otherwise you are probably into investigating the internals of NCL
>>> and support libraries.
>>>
>>> Depending on what you are trying to do, you might need to have one
>>> master NCL program tell multiple slave processes what to display.  HTH.
>>>
>>> --Dave
>>>
>>>
>>> On Fri, Jul 3, 2015 at 3:35 PM, Zhifeng Yang <yangzf01 at gmail.com> wrote:
>>>
>>>> Hi
>>>> I intend to open more than 15 workstations at one time (likely 100
>>>> workstations). However, when I open more than 15 workstations, I got the
>>>> following error.
>>>>
>>>> fatal:WorkstationInitialize: Limit reached for number of simultaneous
>>>> GKS Workstations
>>>> fatal:Unable to initialize layer-Can't Create
>>>>
>>>> And I find the following statement in the description of function
>>>> gsn_open_wks.
>>>> "You can have up to fifteen PostScript workstations open at one time,
>>>> but you can only have one NCGM or PDF workstation open at one time."
>>>>
>>>> Is there any way to open more than 15 workstations at one time?
>>>>
>>>> Thank you
>>>> Zhifeng
>>>>
>>>
>>
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