From: Mike Hearn <mike@plan99•net>
To: "Jorge Timón" <jtimon@monetize•io>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] Faster databases than LevelDB
Date: Tue, 17 Sep 2013 13:45:18 +0200 [thread overview]
Message-ID: <CANEZrP2ZRHfoGugVZ2X9iE8vzdZydJ3JTS=roTv8G=LnCgm7Eg@mail.gmail.com> (raw)
In-Reply-To: <CAC1+kJO8KX6uc7jEz9Otv+BbrJQUk6RvbiyWnP0m=Voh8zdcWQ@mail.gmail.com>
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Nobody has written code to use a better format, migrate old wallets, etc.
On Tue, Sep 17, 2013 at 1:41 PM, Jorge Timón <jtimon@monetize•io> wrote:
> 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
> say
> > 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
> the
> > most interesting for us because that's what UTXO lookups involve.
> >
> > They also compare against HyperLevelDB, where the differences are much
> less
> > pronounced and actually HyperLevelDB appears to be able to do random
> writes
> > faster than Sophia.
> >
>
>
> --
> Jorge Timón
>
> http://freico.in/
>
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next prev parent reply other threads:[~2013-09-17 11:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-17 11:00 Mike Hearn
2013-09-17 11:41 ` Jorge Timón
2013-09-17 11:45 ` Mike Hearn [this message]
2013-09-17 13:48 ` Jorge Timón
2013-09-17 13:20 ` Gregory Maxwell
2013-09-17 17:08 ` Mark Friedenbach
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