How to make multiple queries on the same file efficiently

[JonathanGirardeau]

Hello,

I use Rasqal to parse a TTL file with ~1000 triples. I execute ~350 SPARQL queries to get all info that I need in that file.
It takes ~45sec to do that, it seems super slow to me.

I have been trying to reduce this time without success so far:

• I have tried to reuse the same data graph for all my queries but it is impossible since the data graph is freed when I free the query.
• I have tried to use the same query object for all my queries (multiple calls of rasqal_query_prepare and rasqal_query_execute on the same query) , but it does not work.
• For each query, I use a copy of the data graph by calling rasqal_new_data_graph_from_data_graph instead of creating a new one by calling rasqal_new_data_graph_from_uri, but it does not reduce execution time.

Do the file is read from the filesystem for each query ? It would explain the slowness of it.