Restarting the simulation

Submitted by clarence91 on Fri, 02/06/2015 - 01:20

Hi all,

I am trying to restart the simulation by changing the data file by using "read_restart tmp.restart.120000" command (120000 is the last iteration where I stopped my simulation)

But I was getting this error:

ERROR: Cannot read_restart after simulation box is defined (../read_restart.cpp:75)

Can anyone please help me in fixing this?

Thank you.

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NTT1508 | Fri, 02/06/2015 - 04:44

Hi,

I think it is due to the position of command region... (domain define). Actually you can ignore this command after your first script which has already defined for that.

clarence91 | Fri, 02/06/2015 - 05:10

Thanks for your reply.

If you don't mind, can you please elaborate your explanation wherein I can proceed with my simulation? (I am a new bee to LIGGGHTS)

Thank you

richti83's picture

richti83 | Fri, 02/06/2015 - 08:18

In your main script there is a line

create_box 2 reg

You need to comment this line out because read_restarts creates the box from the information in the readstartfile.

#create_box 2 reg
read_restart tmp.restart.120000

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richti83's picture

richti83 | Fri, 02/06/2015 - 18:22

without input deck we can not help you.
maybe you have accidentally two read_restart commands or a jump command from main script to restart script or a read_data command without add suffix or a read_dump command or a second create box command or ....
As thread-opener you can easily edit your first post and attach the script which causes the problem as *.txt file.
Have a look at these two scripts how I generate restartfiles and load them:
https://github.com/richti83/LIGGGHTS-WITH-BONDS/blob/master/examples/bon... last line writes restart
and
https://github.com/richti83/LIGGGHTS-WITH-BONDS/blob/master/examples/bon... line 29 and 35

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clarence91 | Thu, 02/12/2015 - 08:32

Hi Richi,

Thanks for your reply. I attached my files to this post. Please have a look.
Now I tried to run it by commenting out "read_data" and I get this new error :

ERROR: Need to define compute pair/gran/local or wall/gran/local before first run (../compute_pair_gran_local.cpp:92)

If possible please help me.
Thanks again.

richti83's picture

richti83 | Thu, 02/12/2015 - 10:42

Hi, as the errormessage says you need to have

compute fc all wall/gran/local id contactArea history
compute fpc all pair/gran/local id contactArea history

before the run 0 command in line 62 of your inputdeck ..

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ravirasoon1991 | Sun, 02/15/2015 - 20:30

Hi all,

Is there a way to convert the restart file to text format, so that I can view what all is being written in it?

Thank you.

richti83's picture

richti83 | Sun, 02/15/2015 - 21:24

have a look in tools/ there is a program called reastart2data, just cd in LIGGGHTS-PUBLIC/tools/ and type make restart2data than execute restart2data RESTARTFILE
I'm not sure if the tool needs to slightly modified to match the new granular style used in liggghts3.

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ravirasoon1991 | Mon, 02/16/2015 - 05:02

Thanks for the reply.

I followed your instructions and I am getting this error:
"" Reading restart file ...
WARNING Restart file version does not match restart2data version
restart2data version = 17 May 2012
ERROR: Unknown pair style gran ""

I am not a proficient in C++, if possible may I know how to introduce "pair style gran" in this restart2data file?

ckloss's picture

ckloss | Mon, 02/23/2015 - 12:36

Hi,

restart2data is now deprecated, it has been succeeded by "write_data"

Best wishes
Christoph

clarence91 | Fri, 03/13/2015 - 17:05

Hi all,

1) For PARALLEL runs do I need to define the "write_restart " command in a different way ?

2) Is it possible to write the restart file (append) like for every 1 hour or 2 hours or may be for certain time-steps?

Thank you.

clarence91 | Fri, 03/13/2015 - 17:05

Hi all,

1) For PARALLEL runs do I need to define the "write_restart " command in a different way ?

2) Is it possible to write the restart file (append) like for every 1 hour or 2 hours or may be for certain time-steps?

Thank you.

richti83's picture

richti83 | Fri, 03/13/2015 - 22:15

1) no
2) use restart NNN restart*.bin to write a restartfile every NNN steps

I'm not an associate of DCS GmbH and not a core developer of LIGGGHTS®
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clarence91 | Sat, 03/14/2015 - 05:16

Thanks for your reply.

I tried in all possible ways given in the DOCUMENTATION too but still restart file is not being written.
I would atleast be happy if I get any error but I dont even get that too.

richti83's picture

richti83 | Sat, 03/14/2015 - 20:08

have you defined restart command before run command ?
eq:
restart 1000 restart*.bin
run 10000
should produce restart1000.bin, restart2000.bin ... restart10000.bin
does the path exists (eg. when you dump to RESTART/restart*.bin the folder RESTART needs to exists.
Is your harddrive full ?
does ligggths reach the step a restartfile should be written? In very rare cases restart crashes liggghts with a segfault and does not write (in a not reproducable way) but in this case you should see a segmentation fault / code 11 / MPI_Abort message at the end of console output.
Mind sharing your script where you try to use restart NNN file*.extension.

I'm not an associate of DCS GmbH and not a core developer of LIGGGHTS®
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clarence91 | Sun, 03/15/2015 - 21:26

Problem resolved.

Restart command was after run command.

Thank you.