RDFParserBuilder.toDatasetGraph() is much slower than calling RDFParserBuilder.parse(DatasetGraph) about jena HOT 3 CLOSED

JIT costs?

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JIT costs?

Possibly, this might be a good area to write some JMH benchmarks around

The difference in performance is fairly minimal (though noticeable) in these test cases but I first found this issue because I refactored some $dayjob code and performance went from 15ms to 15 seconds so in worst case it can be dramatic difference

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This is what I get:

t is with transaction, otherwise without.

Same data text creation code.

One round of 5 each: (dataset created outside of the timing)

1: 0.677s
2: 0.463s
3: 0.372s
4: 0.442s
5: 0.335s
t1: 0.255s
t2: 0.249s
t3: 0.328s
t4: 0.302s
t5: 0.237s

reversed:

t1: 0.587s
t2: 0.331s
t3: 0.356s
t4: 0.258s
t5: 0.353s
1: 0.427s
2: 0.322s
3: 0.321s
4: 0.327s
5: 0.335s

and after a few more rounds, 5: 0.315s and t5: 0.237s. So some benefit from a transaction and no harm but specific times by contract

TIM datasets are general and robust (they provide MR+SW and are always thread safe with an "autocommit".

If the app really wants speed, use DatasetGraphFactory.create as in parse-to-dataset_02-- 5: 0.083s and t5: 0.083s. The transaction support is a lock and, being uncontended, it is cheap.

Speed up comes from class loading happening once and JIT-optimizing the parser

    public static void run(String label, Creator<DatasetGraph> maker, String text) {
        DatasetGraph dsg = maker.create();
        long millis = Timer.time(()->{
            RDFParserBuilder builder = RDFParserBuilder.create().lang(Lang.NQUADS).fromString(text);
            builder.parse(dsg);
        });
        System.out.println(label+ ": "+Timer.timeStr(millis)+"s");
    }

    public static void runTxn(String label, Creator<DatasetGraph> maker, String text) {
        DatasetGraph dsg = maker.create();
        long millis = Timer.time(()->{
            dsg.executeWrite(()->{
                RDFParserBuilder builder = RDFParserBuilder.create().lang(Lang.NQUADS).fromString(text);
                builder.parse(dsg);
            });
        });
        System.out.println(label+": "+Timer.timeStr(millis)+"s");
    }

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