Stardog pauses for 13 seconds after every 16,000 requests

[Benjamin Geer]

Hello,

We're encountering a performance issue with Stardog 2.2.4. In a test with four concurrent clients doing SPARQL queries, Stardog consistently pauses for about 13 seconds after approximately every 16,000 requests. All pending requests are delayed while these pauses are occurring. All other requests are completed very quickly (in an average of about 7 ms).

We're testing on Mac OS X machines (3.4 GHz Intel Core i7, 32 GB RAM).

Here's a ZIP file containing the test data and scripts:

https://drive.google.com/file/d/0B3gKYovvPaMIVFk3N1hQdVRBU1U/view?usp=sharing

Steps to reproduce:

1. Make sure you have Python 3 and the requests package installed.

2. Install the provided stardog.properties in $STARDOG_HOME.

3. Run ./create-test-db.sh to create the test database.

4. Open four terminal windows and run ./testit.py in each of them, so that they run concurrently.

The attached screenshot shows the result.

Best regards,

Benjamin Geer

Digital Humanities Lab

University of Basel

[Mike Grove]

Thanks for the report, we'll take a look at get back to you.

Cheers,

Mike

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[Mike Grove]

Hello Benjamin,

Thanks bug report and tests; I was able to reproduce the behavior with Stardog 2.2.4. The fix will be included in the next release.

Cheers,

Mike