3.1.0 vs 3.1.1-SNAPSHOT: slowdown in Model.listStatements(s, p, null, lang)

[François-Paul Servant]

there seems to be a big slowdown between 3.1.0 and 3.1.1-SNASHOT when searching 
for literals. Here are the results of some experiments using the default graph 
of a TDB store (~50 million triples), searching for the label in one lang of 
some resources.

Here’s my code. I store in a Mem Model labels of resources.

        Resource s = res.inModel(m);
        Property p = labelProp.inModel(m);
        
        boolean labelAdded = false;
        if (chrono != null) chrono.start("addLabelToRes”);
        StmtIterator sit = m.listStatements(s, p, null, lang);
        if (sit.hasNext()) {
                resultModel.add(sit);   
                labelAdded = true;
        }       
        sit.close();
        if (chrono != null) chrono.stop("addLabelToRes”);

With 3.1.0 :
addLabelToRes - total time (ms): 11 count: 1336 mean (ms): 0.008233533

With 3.1.1-SNAPSHOT :
labelsForVal.addLabelTo - total time (ms): 249 count: 1336 mean (ms): 0.18637724
 
I made several tries. Results vary but they are fairly consistent: 
3.1.1-SNASHOT is 20 times slower than 3.1.0

fps