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library: Increase the compression RAM usage limit on latest xz

Sunil Mohan Adapa requested to merge sunilmohan/freedom-maker:increase-ram-usage-for-xz into master

  • With latest xz from bookworm, the following message was seen on the build machine: "xz: Reduced the number of threads from 4 to 1 to not exceed the memory usage limit of 1,986 MiB". This led to compression taking longer than an hour resulting in a timeout of the job. xz takes 25% of the RAM by default as the limit and will reduce the number of threads until reaches 1 to accommodate the memory requirement. See xz(1).

  • We could alternatively reduce the compression level to -6 instead of -9 but this results in 630 MiB output instead of 560 MiB. So, for now, let us not take this approach.

Signed-off-by: Sunil Mohan Adapa sunil@medhas.org

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