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authorLasse Collin <lasse.collin@tukaani.org>2010-03-07 13:29:28 +0200
committerLasse Collin <lasse.collin@tukaani.org>2010-03-07 13:29:28 +0200
commit2672bcc9f85ba28ff648e092e9eb4cd9e69ce418 (patch)
tree1f3c218b5b20f5d2ec7fb364fd1c7f5f9c1a04c3 /debug
parentUpdated THANKS. (diff)
downloadxz-2672bcc9f85ba28ff648e092e9eb4cd9e69ce418.tar.xz
Increase the default memory usage limit on "low-memory" systems.
Previously the default limit was always 40 % of RAM. The new limit is a little bit more complex: - If 40 % of RAM is at least 80 MiB, 40 % of RAM is used as the limit. - If 80 % of RAM is over 80 MiB, 80 MiB is used as the limit. - Otherwise 80 % of RAM is used as the limit. This should make it possible to decompress files created with "xz -9" on more systems. Swapping is generally more expected on systems with less RAM, so higher default limit on them shouldn't cause too bad surprises in terms of heavy swapping. Instead, the higher default limit should reduce the number of bad surprises when it used to prevent decompression of files created with "xz -9". The DoS prevention system shouldn't be a DoS itself. Note that even with the new default limit, a system with 64 MiB RAM cannot decompress files created with "xz -9" without user overriding the limit. This should be OK, because if xz is going to need more memory than the system has RAM, it will run very very slowly and thus it's good that user has to override the limit in that case.
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