similar to: Latest revision and backwards compatibility

Hi! Suppose you have a huge notmuch/Xapian database, built on a 32-bit system (well, actually on x86_64-pc-linux-gnu, but using a years old 32-bit notmuch binary; notmuch 0.9, Xapian 1.2.21 -- don't laugh), and suppose you're finally going to update that years old notmuch installation (release by release, forward-porting a bunch of patches). Naturally, I'd now do a native 64-bit

As Chert backend is not the default Xapian backend for the 1.2 branch, I am thinking about switching from Flint to Chert. However, I am wondering how do both compare in performance and index size? My indexes are updated quite frequently, so this is my priority. Which is better in this case? Regards, PK

Hi, I am new to xapian and read somewhere that xapain was using flint before released version 1.1 now it is using chert. I am looking for differences between both flint vs chert respective to xapian and advantages of chert. thanks Smriti

Hi, What's the main difference between chert and flint? What above vs lucene? I am mainly asking about data structure (lexicon, posting list, document data), what's in memory, what's on disk, hash vs b-tree and reasons behind them. Any pointer is appreciated. Thanks! Crystal -------------- next part -------------- An HTML attachment was scrubbed... URL:

Dear All, I've tried to build xapian-core 1.4.3 on MSYS2. It fails with attached error (undefined reference to `exp10'). I think it might be missing an explicit link to 'm'. I'm not able to fix this myself as I do not know autotools sufficiently well, but I hope you might be able to help. Cheers, Mario Emmenlauer -- BioDataAnalysis GmbH, Mario Emmenlauer Tel.

I've just noticed that new indexes no longer have position.{DB,baseA,baseB} files, all previous indexes (I roll indexes every week using xapian-compact) have the position files. The index seems to work but it is returning some odd results, for example if I run a query with the phrase "machine learning" it mostly returns documents containing "machine learning" but it also

---------- Forwarded message ---------- From: Saad Ahmed <ch.saad.ahmed at gmail.com> Date: 3 February 2015 at 21:10 Subject: Waiting for Reply regarding "TestCases Failure" To: Xapian Development <xapian-devel at lists.xapian.org> I have been waiting for reply regarding any further steps to take. Following are the outputs of commands that you asked me to run. All these

On Sat, Mar 25, 2017 at 06:36:25PM -0500, Ryan Cross wrote: > After upgrades my stack is now: > > Python 2.7 > Django 1.8 > Haystack 2.6.0 > Xapian 1.4.3. (latest xapian haystack backend with some modifications) > > Using the same rebuild command as below but with —batch-size=50000 > > The issue has now become one of performance. I am indexing 2.2 million >

Hi guys, I discovered xapian today and I'm trying it because it looks promising compared to other FTS engines. However I'm in a windows environment so it's a bit painful to set up as there is no official binaries. I've heard about http://www.flax.co.uk/xapian_binaries And I'm trying to build their latest release (1.2.8). After a few tries I manage to compile everything with

So, given what I've read in the documentation I would create a text file named document_database.txt that might have the following: remote 192.168.1.10:30000 chert /var/lib/xapian_database/segment1 remote 192.168.1.10:30000 chert /var/lib/xapian_database/segment2 remote 192.168.1.10:30000 chert /var/lib/xapian_database/segment3 etc. I would then in my PHP program open

Report by Eric Lindblad 13-09-2015 http://www.ericlindblad.blogspot.com cf: http://comments.gmane.org/gmane.comp.search.xapian.general/9862 I ported xapian-core-1.2.21 to Interix today having disabled the default chert and development brass backends, using flint, which was the 1.0.x series' default, which ships with the 1.2.x series; the disabling do to an unresolved 'ambiguous

Olly Betts writes: > On Thu, Dec 07, 2017 at 10:29:09AM +0100, Jean-Francois Dockes wrote: > > Recoll builds snippets by partially reconstructing documents out of index > > contents. > > > [...] > > > > The specific operation which has become slow is opening many term position > > lists, each quite short. > > The difference will actually

I am suffering for slow searching performance on Xapian. I am using Xapian for indexing about 150,000,000 documents. It was implemented in C++; The performance of searching was not that fast. e.g. Searching a query, which includes about 20 terms, needs 2 secs avg. For searching, I followed such steps: 1. construct a QueryParser for certain string 2. parse the query to get a Xapian::Query

> Is that the complete output? Yes it is the complete output against "./runtest ./apitest --verbose topercent2"( after running make remove-cached-databases). I attached the snapshot of the output of commands but the size of the email got bigger than 40kb so i had to place the output as text. If I do not run "make remove-cached-databases" and run "./runtest ./apitest

Report by Eric Lindblad 30-09-2015 http://www.ericlindblad.blogspot.com The xapian-core-1.2.21 'ambiguous overload' error on the files /backends/brass/brass_check.cc and /backends/chert/chert_check.cc appear to be resultant of a bug reported in gcc-3.3.4, which was fixed for 3.4.2 [Sept. 6, 2004] and 3.5. Bug 16854 - streams missing "long long" specializations on Tru64

On Sun, Jan 18, 2015 at 04:25:29PM +0000, James Aylett wrote: > That?s exactly how it?s supposed to work. ?Eventually? (once the > writer gets sufficiently far ahead of the reader), the reader will get > a DatabaseModifiedError and will have to re-open the database, but > until then it?s up to it when it does so. You may wish to do it every > N requests, or every K seconds, or only

I hadn't noticed any interactive slowdown, but when I got around to running the notmuch performance suite, there seems to be some noticable slowdown with the glass backend (default in Xapian 1.3.5) compared to chert (using xapian 1.2.22) These tests are on an older i7 with 12G of RAM and an SSD. I'm reasonable confident they are CPU bound. One curious thing is the increase in system time

Hi, I've a program which: 1. Sets XAPIAN_FLUSH_THRESHOLD=1000 2. Opens a (new) database for write 3. Indexes a few thousand documents 4. Periodically also does queries on the database With 1.1.4, with certain document sets (basically a particular mail folder of mine), Enquire.get_mset() sometimes (but not always) triggers a "RangeError: Value in posting list too

Hi, I'm experiencing problems when doing phrase searches with adjacent repeated terms. Example: if I search for 'curtain curtain' and there are documents that matches the query, they aren't returned. But, if I search for 'curtain nice curtain' and there are documents that matches this query, it works ok. attached there is a python program that shows the problem. I tried

On Tue, Aug 20, 2013 at 07:28:42PM +0800, jiangwen jiang wrote: > I think norm(t, d) in Lucene can used to caculate the number which is > similar to doc length(see norm(t,d) in > http://lucene.apache.org/core/3_5_0/api/all/org/apache/lucene/search/Similarity.html#formula_norm). It sounds similar (especially if document and field boosts aren't in use), though some places may rely on