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Constant growth of memory [message #1796345]

Thu, 11 October 2018 11:02

Vito Scornavacche

Messages: 14
Registered: February 2018

Junior Member

Hi all,
I have a Raspberry pi2 with Kura on-board. It is reading with ModbusTCP 2 assets with about 40 signals each one and sends its to a MQTT broker. When it starts the memory used by the java process is about 29% of the total 1 GB. The problem is that every hour it grow of about 0,2% until it goes to an out of memory stop.
Had someone the same problem or is one of my custom components having memory leakage?

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Re: Constant growth of memory [message #1796468 is a reply to message #1796345]

Sun, 14 October 2018 07:03

Matteo Maiero

Messages: 423
Registered: July 2015
Location: Italy

Senior Member

Hi,
could you provide more information about the setup, version of Kura, eventually third party software installed.

Best regards,
Matteo

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Re: Constant growth of memory [message #1796585 is a reply to message #1796345]

Tue, 16 October 2018 10:50

Marco Noto

Messages: 10
Registered: November 2017
Location: Turin

Junior Member

cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 7 (wheezy)"
NAME="Raspbian GNU/Linux"
VERSION_ID="7"
VERSION="7 (wheezy)"
ID=raspbian

java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) Client VM (build 25.0-b70, mixed mode)

kura_3.2.0_raspberry-pi-2

We use some custom ConfigurableComponent, (like signal filter), and custom pubisher (in order to modify the output message) but we are reasonably sure that we have not created code that can generate memory leaks.

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Re: Constant growth of memory [message #1796601 is a reply to message #1796585]

Tue, 16 October 2018 12:28

Matteo Maiero

Messages: 423
Registered: July 2015
Location: Italy

Senior Member

I would suggest to experiment with a clean Kura.
It's difficult to understand the cause, if you are using also custom modules.
To try to identify the root cause you can also use a profiler.

Best regards,
Matteo

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Re: Constant growth of memory [message #1796629 is a reply to message #1796601]

Tue, 16 October 2018 15:49

Marco Noto

Messages: 10
Registered: November 2017
Location: Turin

Junior Member

Yes, we are analyzing the memory dump with MemoryAnalyzer, thank you Matteo.

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Re: Constant growth of memory [message #1797028 is a reply to message #1796629]

Wed, 24 October 2018 09:48

Marco Noto

Messages: 10
Registered: November 2017
Location: Turin

Junior Member

We found out that this could be a bug from old versions of the linux kernel used in join with JVM: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1655842
We updated the distribution to Raspbian GNU/Linux 9 (stretch) and the kernel to 4.9.59-v7+, and we solved.

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