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Date: Tue, 17 Sep 2013 13:41:30 +0200
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From: =?ISO-8859-1?Q?Jorge_Tim=F3n?= <jtimon@monetize.io>
To: Mike Hearn <mike@plan99.net>
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Faster databases than LevelDB
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Only slightly related to this...
What's the reason why BerkleyDB is maintained for the wallet?
I think it would be a good thing to get rid of the libdb4.8++-dev
dependency that makes bitcoind harder to compile on debian and ubuntu.
Unless, of course, there's a reason I am missing...


On 9/17/13, Mike Hearn <mike@plan99.net> wrote:
> LevelDB is fast - very fast if you give it enough CPU time and disk seeks=
.
> But it's not the last word in performance.
>
> HyperLevelDB is a forked LevelDB with some changes, mostly, finer grained
> locking and changes to how compaction works:
>
> http://hyperdex.org/performance/leveldb/
>
> However, it comes with a caveat - one of the changes they made is to take
> away write throttling if compaction falls behind, the app itself is
> expected to do that.
>
> Sophia is a competitor to LevelDB. The website claims that in benchmarks =
it
> completely smokes LevelDB. I have not explored how it does this or tried =
to
> replicate their benchmarks myself:
>
> http://sphia.org/index.html
> http://sphia.org/benchmarks.html
>
> It's written in C and BSD licensed.
>
> As an example of the kind of speedup they claim to be capable of, they sa=
y
> LevelDB could do 167,476 random reads per second on their SSD based
> machine. Sophia could do 438,084 reads/sec. Random reads are of course th=
e
> most interesting for us because that's what UTXO lookups involve.
>
> They also compare against HyperLevelDB, where the differences are much le=
ss
> pronounced and actually HyperLevelDB appears to be able to do random writ=
es
> faster than Sophia.
>


--=20
Jorge Tim=F3n

http://freico.in/