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[Hannes Ebner <question270906@xxxxxxxxxxxxxxxxxxxxx>]

New question #270906 on Duplicity:
https://answers.launchpad.net/duplicity/+question/270906

On one of my VMs I've started to experience problems because of low memory, see traceback below:

Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1523, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1517, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1371, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1499, in do_backup
    incremental_backup(sig_chain)
  File "/usr/bin/duplicity", line 656, in incremental_backup
    globals.backend)
  File "/usr/bin/duplicity", line 421, in write_multivol
    globals.gpg_profile, globals.volsize)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 332, in GPGWriteFile
    file = GPGFile(True, path.Path(filename), profile)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 163, in __init__
    'logger': self.logger_fp})
  File "/usr/lib/python2.7/dist-packages/duplicity/gpginterface.py", line 374, in run
    create_fhs, attach_fhs)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpginterface.py", line 414, in _attach_fork_exec
    process.pid = os.fork()
OSError: [Errno 12] Cannot allocate memory

I'm using Ubuntu 12.04 with Duplicity 0.7.04. This problem only started recently, no relevant packages (gpg, bzip, duplicity) have been updated between the last successful backup and now.

The VM has 1 GB of RAM and 512 MB of swap. When I increased swap from 512 MB to 1 GB the problem went away.

According to Duplicity's backup statistics the SourceFileSize is 22.7 GB.

Now to my question: obviously the backup size has come to a level where 1 GB RAM /512 MB swap are insufficient (or did I come to the wrong conclusion?), which makes me curious about the necessary amount of RAM for running backups?

I'm backing up to Google Cloud Storage with --gpg-options="--compress-algo=bzip2 --bzip2-compress-level=9" --volsize=200.

Will lowering the compression level decrease the demands for memory? Does the volume size affect memory consumption?

Cheers,
Hannes

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