On Wed, 1 Jul 2020 18:20:19 +0800
Li-Wen Hsu <lw...@freebsd.org> wrote:
> 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.
The top show getblk status often.
Please tell me what you can and how to look with DTrace.
I use
dtrace -n '::: /execname == "a.out"/ { @[probefunc] = count(); }'
but I do not see the difference between Hash and Btree.
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