From: Jim Meyering Date: Sun, 13 Sep 2009 10:11:57 +0000 (+0200) Subject: doc: NEWS: say quadratic and linear, rather than O(N^2) and O(N) X-Git-Tag: v8.0~55 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f6f78f093b57f2abf82c2ba3d7bf65e533af6ae7;p=thirdparty%2Fcoreutils.git doc: NEWS: say quadratic and linear, rather than O(N^2) and O(N) * NEWS: Use a slightly less technical description. Suggested by Andreas Schwab. --- diff --git a/NEWS b/NEWS index ec41ca7732..980fb543fd 100644 --- a/NEWS +++ b/NEWS @@ -13,12 +13,13 @@ GNU coreutils NEWS -*- outline -*- This makes rm -rf significantly faster (400-500%) in some pathological cases, and slightly slower (20%) in at least one pathological case. - rm -r deletes deep hierarchies more efficiently. Before, it took O(N^2) - time, now it takes O(N), where N is the depth of the hierarchy. However, - this improvement is not as pronounced as might be expected for very - deep trees, because prior to this change, for any relative name length - longer than 8KiB, rm -r would sacrifice official conformance to avoid the - disproportionate O(N^2) performance penalty. Leading to another improvement: + rm -r deletes deep hierarchies more efficiently. Before, execution time + was quadratic in the depth of the hierarchy, now it is merely linear. + However, this improvement is not as pronounced as might be expected for + very deep trees, because prior to this change, for any relative name + length longer than 8KiB, rm -r would sacrifice official conformance to + avoid the disproportionate quadratic performance penalty. Leading to + another improvement: rm -r is now slightly more standards-conformant when operating on write-protected files with relative names longer than 8KiB.