[Bitcoin-development] Faster databases than LevelDB
mike at plan99.net
Tue Sep 17 11:45:18 UTC 2013
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 at 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 at plan99.net> wrote:
> > LevelDB is fast - very fast if you give it enough CPU time and disk
> > 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
> > completely smokes LevelDB. I have not explored how it does this or tried
> > 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
> > 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
> > most interesting for us because that's what UTXO lookups involve.
> > They also compare against HyperLevelDB, where the differences are much
> > pronounced and actually HyperLevelDB appears to be able to do random
> > faster than Sophia.
> Jorge Timón
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