# CCTM operation interrupted

**URL:** https://forum.cmascenter.org/t/cctm-operation-interrupted/5867
**Category:** CMAQ
**Tags:** cmaq
**Created:** [June 25, 2025, 7:53am UTC](https://forum.cmascenter.org/t/cctm-operation-interrupted/5867 "2025-06-25T07:53:43Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Bailey](https://avatars.discourse-cdn.com/v4/letter/b/8491ac/32.png) [@Bailey](https://forum.cmascenter.org/u/Bailey)
#### Post date: [June 25, 2025, 7:53am UTC](https://forum.cmascenter.org/t/cctm-operation-interrupted/5867/1 "2025-06-25T07:53:43Z")

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Hello everyone, I was running the CMAQ 5.5/CCTM script and the program suddenly got stuck here:

Processing Day/Time [YYYYDDD:HHMMSS]: 2020154:145500  
Which is Equivalent to (UTC): 14:55:00 Tuesday, June 2, 2020  
Time-Step Length (HHMMSS): 000500  
VDIFF completed… 5.3772 seconds  
COUPLE completed… 0.1493 seconds

 ![1750837733118](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/d/d5adc19f99a531fb7ad5da93b9a2b31c790a9ff8.png)

However, I didn’t find any errors in the LOG files. What’s odd is that some of my LOG files keep growing in size—for example, in the image below, the file CTM\_LOG\_000.v55\_intel\_china6\_20200602 has grown to 25 GB and is still expanding, while the other files are only a few hundred KB.

 ![1750837916128](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/b/bc928ad9b31a32232ab27ad26968ba2f5cfb25f0.png)

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### Author: ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)
#### Post date: [June 30, 2025, 3:53pm UTC](https://forum.cmascenter.org/t/cctm-operation-interrupted/5867/2 "2025-06-30T15:53:48Z")

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Please use cat or more to visualize what is in the CTM\_LOG\_000\* file that is causing it to grow to 25GB, and share a snippet of message that is being written.

Or, you could also do an sdiff (side by side difference between the CTM\_LOG\_000 and the CTM\_LOG\_001 to find the text that is being written to the CTM\_LOG\_000 file. There may be a print statement that prints out underflow or overflow values that is being written only to processor 0’s log file.

If this is the case, please re-compile in debug mode and rerun to catch the error.

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### Author: ![system](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/1X/9a72c78e529465c3f1053af404e3033b0875428c.png) [@system](https://forum.cmascenter.org/u/system)
#### Post date: [July 7, 2025, 3:54pm UTC](https://forum.cmascenter.org/t/cctm-operation-interrupted/5867/3 "2025-07-07T15:54:27Z")

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