Experimental Physics and Industrial Control System
|
Hello tech-talk,
We have an IOC repeatedly locking up with the infamous “cbLow ring buffer full” message. The IOC consumes data from our CAEN Pico-8 card via an EPICS driver at 100Hz (about 1200-1215 events per second total) , and at some point on the order
of hours to days, seems to stop consuming callbacks from the queue. I wrote a script to track this, and it seems to all be happening in one shot. Below is some data I captured from the last time this happened. Before this, everything was happy for about 4
hours, but sometimes it takes up to a week for this to happen.
Time
|
High-water
|
Items in q
|
Q capacity
|
%
|
Oflws
|
|
6/7/2021 19:22:40
|
13
|
0
|
12000
|
0
|
0
|
6/7/2021 19:22:41
|
13
|
0
|
12000
|
0
|
0
|
6/7/2021 19:22:42
|
13
|
0
|
12000
|
0
|
0
|
6/7/2021 19:22:44
|
13
|
0
|
12000
|
0
|
0
|
6/7/2021 19:22:45
|
571
|
571
|
12000
|
4.8
|
0
|
6/7/2021 19:22:46
|
1778
|
1778
|
12000
|
14.8
|
0
|
6/7/2021 19:22:47
|
2991
|
2991
|
12000
|
24.9
|
0
|
6/7/2021 19:22:48
|
4204
|
4204
|
12000
|
35
|
0
|
6/7/2021 19:22:49
|
5406
|
5406
|
12000
|
45
|
0
|
6/7/2021 19:22:50
|
6619
|
6619
|
12000
|
55.2
|
0
|
6/7/2021 19:22:51
|
7834
|
7834
|
12000
|
65.3
|
0
|
6/7/2021 19:22:52
|
9048
|
9048
|
12000
|
75.4
|
0
|
6/7/2021 19:22:53
|
10249
|
10249
|
12000
|
85.4
|
0
|
6/7/2021 19:22:54
|
11462
|
11462
|
12000
|
95.5
|
0
|
6/7/2021 19:22:56
|
12000
|
12000
|
12000
|
100
|
1
|
6/7/2021 19:22:58
|
12000
|
12000
|
12000
|
100
|
1
|
|
|
|
|
|
|
|
|
|
Has anyone else experienced this? If so, what is the remedy? I can’t seem to correlate it to anything unusual happening in the OS/kernel.
Thanks,
Evan
|
- Replies:
- Re: cbLow consumption randomly stopping Johnson, Andrew N. via Tech-talk
- Re: cbLow consumption randomly stopping Mark Rivers via Tech-talk
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RE: Going full PVA? Leblanc, Gregory via Tech-talk
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ANJ, 08 Jun 2021 |
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