Date: Wed, 1 Jul 2020 18:20:19 +0800 From: Li-Wen Hsu <lwhsu@freebsd.org> To: Nick Kostirya <nikolay.kostirya@i11.co> Cc: freebsd-stable@freebsd.org Subject: Re: BerkeleyDB Hash vs Btree on FreeBSD and Linux Message-ID: <CAKBkRUwnc9aC00NasdMX=g8n1jhiXvfPDwjKaz2sYbB4Hspk5g@mail.gmail.com> In-Reply-To: <20200701130649.0b0643d5@i11.co> References: <20200701130649.0b0643d5@i11.co>
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On Wed, Jul 1, 2020 at 6:07 PM Nick Kostirya via freebsd-stable <freebsd-stable@freebsd.org> wrote: > > Hello. > > I noticed that BerkeleyDB Hash is VERY slow compared to BerkeleyDB Btree on FreeBSD (UFS or ZFS). > But they (Hash and Btree) have roughly the same performance on Linux. > > Why? It's not an easy question, do you have more information about the test environment setup, and the statistics of the results? I'd recommend using some analysis tools like DTrace to check what it's busy for. Li-Wen
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