From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1VLtk7-0004I7-3r for bitcoin-development@lists.sourceforge.net; Tue, 17 Sep 2013 11:46:55 +0000 Received: from mail-lb0-f174.google.com ([209.85.217.174]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1VLtk3-0007Bk-Mu for bitcoin-development@lists.sourceforge.net; Tue, 17 Sep 2013 11:46:55 +0000 Received: by mail-lb0-f174.google.com with SMTP id w6so5238782lbh.33 for ; Tue, 17 Sep 2013 04:46:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=fpd4ckJ+Tsfd+rMNqfyXqYLnRU2ljur9CZ9qWFJB5WM=; b=W1AWW1KosxwDZaf7SMbycl4LFGVT4cmkPOY5T22YoECtyUnzJGlc3XryPAS7C3tg2v iCRqbHTd0nTsy/ky+0ojMYy57fsJEAjpI8qmc7jVvSOXpG5UgjXYaLfuf+Eq9Wg6HcRD MPKYoB3O1jmi5FCU5yO9QXSCcdU8gZhoDyEeDyYvC6W6IP1+9CxxN4cxzbPLWDN6even 2CUQ5gs6zwU27r3rKqFlD8ksSeqzSxN3QYpabTeBQo0XFvIpL3CAie6nvtQ+mkAZaDtO TuHcLve9GDoL0kiMtt3rtlY1ugS1CCgB4kwus1o35oZ4Ey1vDALhCZ/aO4hrN2XAQSGg WeAg== X-Gm-Message-State: ALoCoQmFZVlVdaGb1CDV6eQGWh6zoOYO/uHQeP2wm2HiC48w9vrjpaLKrdFfmMKcq+Bloz408j65 MIME-Version: 1.0 X-Received: by 10.112.29.17 with SMTP id f17mr882230lbh.45.1379418090116; Tue, 17 Sep 2013 04:41:30 -0700 (PDT) Received: by 10.112.40.15 with HTTP; Tue, 17 Sep 2013 04:41:30 -0700 (PDT) X-Originating-IP: [85.53.133.29] In-Reply-To: References: Date: Tue, 17 Sep 2013 13:41:30 +0200 Message-ID: From: =?ISO-8859-1?Q?Jorge_Tim=F3n?= To: Mike Hearn Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. X-Headers-End: 1VLtk3-0007Bk-Mu Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Faster databases than LevelDB X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Sep 2013 11:46:55 -0000 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 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/