From: Kuan-Wei Chiu <visitorckw@gmail.com>
To: colyli@suse.de, kent.overstreet@linux.dev
Cc: bfoster@redhat.com, jserv@ccns.ncku.edu.tw,
linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-bcachefs@vger.kernel.org,
Kuan-Wei Chiu <visitorckw@gmail.com>
Subject: [PATCH 0/5] Optimize number of comparisons for heap/heapsort implementaion
Date: Sun, 21 Jan 2024 23:36:44 +0800 [thread overview]
Message-ID: <20240121153649.2733274-1-visitorckw@gmail.com> (raw)
Hello,
The existing implementations of heap/heapsort follow the conventional
textbook approach, where each heapify operation requires approximately
2*log2(n) comparisons. In this series, I introduce a bottom-up variant
that reduces the number of comparisons during heapify operations to
approximately log2(n), while maintaining the same number of swap
operations.
Thanks,
Kuan-Wei
Kuan-Wei Chiu (5):
bcachefs: Optimize eytzinger0_sort() using bottom-up heapsort
bcachefs: Introduce parent function for sort_cmp_size()
bcachefs: Optimize sort_cmp_size() using bottom-up heapsort
bcachefs: Optimize number of comparisons in heap_sift_down
bcache: Optimize number of comparisons in heap_sift
drivers/md/bcache/util.h | 23 +++++----
fs/bcachefs/util.c | 109 ++++++++++++++++++++++++++-------------
fs/bcachefs/util.h | 23 +++++----
3 files changed, 98 insertions(+), 57 deletions(-)
--
2.25.1
next reply other threads:[~2024-01-21 15:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-21 15:36 Kuan-Wei Chiu [this message]
2024-01-21 15:36 ` [PATCH 1/5] bcachefs: Optimize eytzinger0_sort() using bottom-up heapsort Kuan-Wei Chiu
2024-01-21 15:36 ` [PATCH 2/5] bcachefs: Introduce parent function for sort_cmp_size() Kuan-Wei Chiu
2024-01-21 16:17 ` Kent Overstreet
2024-01-21 17:05 ` Kuan-Wei Chiu
2024-01-21 17:37 ` Kent Overstreet
2024-01-21 15:36 ` [PATCH 3/5] bcachefs: Optimize sort_cmp_size() using bottom-up heapsort Kuan-Wei Chiu
2024-01-21 15:36 ` [PATCH 4/5] bcachefs: Optimize number of comparisons in heap_sift_down Kuan-Wei Chiu
2024-01-21 15:36 ` [PATCH 5/5] bcache: Optimize number of comparisons in heap_sift Kuan-Wei Chiu
2024-01-21 16:21 ` [PATCH 0/5] Optimize number of comparisons for heap/heapsort implementaion Kent Overstreet
2024-01-21 16:55 ` Kuan-Wei Chiu
2024-01-21 17:41 ` Kent Overstreet
2024-01-22 15:06 ` Kuan-Wei Chiu
2024-01-22 16:06 ` Kent Overstreet
2024-01-22 16:23 ` Kuan-Wei Chiu
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