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I am suffering from excessive memory usage, currently amounting to ~940 MB physical and ~1 GB swap memory, on my Ubuntu 15.04 x64 Docker (1.9.1-cs2, build 4ade326) host. According to top, Docker is responsible for the consumption of about 780 MB of swap memory. How can I figure out why Docker is using so much swap?

I am mainly running a Node.js Docker container, which doesn't seem to consume that much memory. The memory usage is also rising over a few hours, as it's quite modest after booting up.

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  • Why the vote to close? Commented Jan 13, 2016 at 6:27
  • I've enabled memory/swap accounting on the node now, hoping this will reign the swap usage in. Commented Jan 13, 2016 at 11:01
  • What do you mean by "According to top, Docker is responsible for the consumption of about 780 MB of swap memory"? I suspect you have misread the output. Commented Jan 13, 2016 at 13:05
  • @MichaelHampton I was reading top's swap column for the docker process, quite simply. Commented Jan 13, 2016 at 13:10
  • OK, so what appeared in the column? Commented Jan 13, 2016 at 13:14

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It's not a super satisfying answer, but enabling memory and swap accounting in the kernel seems to have reined in the excessive memory usage.

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  • Unfortunately, I see Docker is back to using ~780 MB of swap :( It is the docker process itself (according to /proc/<pid>/status) that is responsible for this. Commented Jan 27, 2016 at 12:21

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