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# ensure that "rm -rf DIR-with-many-entries" is not O(N^2)
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# Copyright (C) 2008-2011 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/init.sh"; path_prepend_ ../src
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# Using rm -rf to remove a 400k-entry directory takes:
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# - 9 seconds with the patch, on a 2-yr-old system
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# - 350 seconds without the patch, on a high-end system (disk 20-30% faster)
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# The number of entries in our test directory.
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# Choose a value that is large enough to ensure an accidentally
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# regressed rm would require much longer than $threshold_seconds to remove
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# the directory. With n=400k, pre-patch GNU rm would require about 350
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# seconds even on a fast disk. On a relatively modern system, the
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# patched version of rm requires about 10 seconds, so even if you
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# choose to enable very expensive tests with a disk that is much slower,
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# the test should still succeed.
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# Skip unless "." is on an ext[34] file system.
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# FIXME-maybe: try to find a suitable file system or allow
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# the user to specify it via an envvar.
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df -T -t ext3 -t ext4dev -t ext4 . \
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|| skip_ 'this test runs only on an ext3 or ext4 file system'
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# Skip if there are too few inodes free. Require some slack.
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free_inodes=$(stat -f --format=%d .) || framework_failure_
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min_free_inodes=$(expr 12 \* $n / 10)
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test $min_free_inodes -lt $free_inodes \
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|| skip_ "too few free inodes on '.': $free_inodes;" \
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"this test requires at least $min_free_inodes"
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seq $n | xargs touch &&
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test $ok = 1 || framework_failure_
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setup_duration=$(expr $(date +%s) - $start)
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echo creating a $n-entry directory took $setup_duration seconds
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# If set-up took longer than the default $threshold_seconds,
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# use the longer set-up duration as the limit.
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test $threshold_seconds -lt $setup_duration \
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&& threshold_seconds=$setup_duration
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timeout ${threshold_seconds}s rm -rf d; err=$?
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duration=$(expr $(date +%s) - $start)
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124) fail=1; echo rm took longer than $threshold_seconds seconds;;
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echo removing a $n-entry directory took $duration seconds
added
removed
tests/rm/ext3-perf
