Input requires too much data

[Tom]

Hello,

I am trying to restart a calculation and am getting the error:

forrtl: severe (67): input statement requires too much data, unit 39,
file c:\Program Files\FDS\FDS5\bin\CHID_0001.restart"

I have successfully restarted an almost identical input file that is
slightly larger than this one, and my computer has 12 GB of RAM, so I
doubt it is really an issue with my computer's memory.

I have version 5.5.3, SVN 7031

Could you please help me out with this?

[Kevin]

Even if I had the input file, I don't have a Windows machine big
enough for the case. I suggest you avoid trying to restart big jobs
under Windows. It's just not a good OS for doing big calcs.

[Steffen Sæle]

I realize this is an old thread, but I had the same issue, so I googled some key-words and this thread is what I found first. 

For me, this issue was resolved typing RESTART=.TRUE. on the MISC line in Pyrosim (Version 2018.2.0730 for FDS 6.6.0 and later). Then I used "Analysis"-> "Resume FDS Paralell..." on the main tool bar. Just trying some random stuff as it didn't work using DOS in MS. 

I guess this could be a tip for anyone who stumble upon this thread later.

[fde]

Could you elaborate your problem a bit more? I understand it was a MPI run with multiple mesh and it did not restart with command line then you restarted via Pyrosim. Could you share the command line you tried first? 

I assumed Pyrosim is also using the same command lines to control FDS, it is just an interface. If your calculation worked then there must be an explanation.

[Steffen Sæle]

Yes, it did restart with PyroSim, not via DOS directly.

The problem was simply restarting the simulation after a computer failure, more precise, the loss of connection to the server where the license for the PyroSim software is located. 

As I haven't run into this issue before, I checked the user guide for FDS and found how to restart using the RESTART=.TRUE. on the MISC line. I just used the txt file produced by PyroSim and added this line. Further, I used DOS to restart the simulation and I received a message similar to the one posted in the beginning of this thread:  input statement requires too much data. I found the thread after googling this text. 

As I didn't want to waste the time already put into the simulation, I just tried to type the same text directly into PyroSim via the "Record View". Further I used the main tool bar: Analysis-> Resume FDS paralell... This worked...  

I can't really see the significant difference myself. Also, I don't know why it didn't work in the first place, I was just under the impression that this had something to do with the Windows OS not always being the most appropriate... 

The difference however:

Directly in the "txt" file and simulated through the DOS:

--------------------PyroSim-generated Section--------------------

&HEAD CHID='Test3'/

&TIME T_END=200.0/

&DUMP RENDER_FILE='Test3.ge1', COLUMN_DUMP_LIMIT=.TRUE., DT_RESTART=50.0, DT_SL3D=0.25/

&MISC VISIBILITY_FACTOR=8.0, RESTART=.TRUE./

The text created in PyroSim (adding a "User section"):

-------------User Section (not generated by PyroSim)-------------

&MISC RESTART=.TRUE.,/

--------------------PyroSim-generated Section--------------------

&HEAD CHID='Test3'/

&TIME T_END=200.0/

&DUMP RENDER_FILE='Test3.ge1', COLUMN_DUMP_LIMIT=.TRUE., DT_RESTART=50.0, DT_SL3D=0.25/

&MISC VISIBILITY_FACTOR=8.0/

...............

As you can see, the second partial-code made a successful restart. The only difference is the order of the MISC line. I guess a deeper understanding of how the text is implemented in the FDS code and/or how PyoSim is doing this, is required.  

[Bryan Klein]

In PyroSim, you should only need to use the Resume feature in the Analysis menu.  Adding the text to the additional records section is unnecessary.  If you find that this does not work as expected, please email sup...@thunderheadeng.com and we can help you further.

-Bryan Klein

Thunderhead

[Steffen Sæle]

No, PyroSim worked as expected. The problem arose when I tried to do the same via the FDS- text file, and starting the simulation through MS-DOS.

[dr_jfloyd]

Is the version of fds used by Pyrosim the same as the one run when using a command window?

[Steffen Sæle]

Yes.

[vrajesh]

Hello steffen, I do have same problem while restarting my simulation, its indicating ' input statement requires too much data ' both in windows command and Pyrosim after adding MISC Command. do you have any idea for around 500 mb Restart file what computer specification needed in terms of RAM.