From nobody Wed Apr 19 21:41:20 2023 X-Original-To: dev-commits-src-main@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4Q1vPG6g82z45GT6; Wed, 19 Apr 2023 21:41:22 +0000 (UTC) (envelope-from hselasky@freebsd.org) Received: from mail.turbocat.net (turbocat.net [88.99.82.50]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4Q1vPG5g0kz49QG; Wed, 19 Apr 2023 21:41:22 +0000 (UTC) (envelope-from hselasky@freebsd.org) Authentication-Results: mx1.freebsd.org; none Received: from [10.36.2.154] (unknown [46.212.121.255]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by mail.turbocat.net (Postfix) with ESMTPSA id 78C5C2600F3; Wed, 19 Apr 2023 23:41:19 +0200 (CEST) Message-ID: <42d63675-9b1f-70dc-a1da-fef3d43790fd@freebsd.org> Date: Wed, 19 Apr 2023 23:41:20 +0200 List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-main@freebsd.org X-BeenThere: dev-commits-src-main@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: git: 8dcf3a82c54c - main - libc: Implement bsort(3) a bitonic type of sorting algorithm. Content-Language: en-US To: Jessica Clarke Cc: Brooks Davis , src-committers , dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org References: <202304191206.33JC6Qcp062380@gitrepo.freebsd.org> <3B5734C4-8630-4CD5-BA8D-DE33899161F1@freebsd.org> <2840BE79-CC25-427A-A5E9-476A38E749E3@freebsd.org> From: Hans Petter Selasky In-Reply-To: <2840BE79-CC25-427A-A5E9-476A38E749E3@freebsd.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4Q1vPG5g0kz49QG X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:24940, ipnet:88.99.0.0/16, country:DE] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-ThisMailContainsUnwantedMimeParts: N On 4/19/23 22:17, Jessica Clarke wrote: > pdqsort is n log n time, in-place and doesn’t allocate, and is used, > for example, for Rust’s standard sort_unstable. Hi Jessica, Like many many people have tried over the years, to improve the belated QuickSort (*) algorithm since it was invented, by catching bad behaviour and then fallback to other algorithms, pdqsort() is not a solution! Yes, it is probably "N log N" time, but if you read the code carefully, it falls back to heapsort(), which indeed uses malloc(), which is exactly my point, that I want to avoid. Please come forward with a "N log N" time algorithm which is malloc() and alloca() free, and then we'll talk! And not at least BSD-2-clause licensed and not covered by any patents, GPLv2 or whatever! --HPS (*) https://en.wikipedia.org/wiki/Quicksort