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Constant growth of memory [message #1796345]

Thu, 11 October 2018 07:02

Eclipse User

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?

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

Sun, 14 October 2018 03:03

Eclipse User

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

Best regards,
Matteo

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

Tue, 16 October 2018 06:50

Eclipse User

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.

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

Tue, 16 October 2018 08:28

Eclipse User

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

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

Tue, 16 October 2018 11:49

Eclipse User

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

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

Wed, 24 October 2018 05:48

Eclipse User

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.

Re: Constant growth of memory [message #1797032 is a reply to message #1797028]

Wed, 24 October 2018 06:00

Eclipse User

thank you for the update

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