To put some context, that's a very unfavorable query for Lucene (sort by data other than score, retrieve all the data set).
On Mon 16-10-24 17:42, Sanne Grinovero wrote: >Hi all, >at our last meeting we had some chats about heap usage at runtime. > >I wasn't actually investigating this, but since I was running some >tests now I thought it was interesting to share the following figures >about the Hibernate Search / Lucene query engine. > ># Index size >My test is running with an off-heap index of about 5 million entries, >which translates to about 170MB of disk space. > ># Query type >We're running a large query which matches every single one of the 5 >million entries, and sorting the results on a Float property. > ># TLAB usage >Running such a query takes 2.78 MB of TLAB; this data is never >promoted so it's "cheap" to collect as there's no much interaction >with other threads. > ># Beyond TLAB >Allocating zero bytes ;) > >In terms of memory usage this looks quite good; kudos to the Lucene >team of course as they do the heavy lifting, but I'm proud of the >Hibernate Search team as well as we don't add significant overhead. >We still have some work to do, as while memory looks good the sorting >on Floats is still very heavy.. but we'll figure it out. > >Looking forward to see similar metrics from get/put tests on Infinispan ;-) > >N.B. this is an "off heap" index, but even if I use an "on heap" >index, above figures are pretty much the same, and the performance >doesn't get higher, but slower. > >Thanks, >Sanne >_______________________________________________ >infinispan-dev mailing list >infinispan-dev@lists.jboss.org >https://lists.jboss.org/mailman/listinfo/infinispan-dev _______________________________________________ infinispan-dev mailing list infinispan-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/infinispan-dev
