Same result. This is the source code.

This test tells us that insert() locks too (too many internal resize and
system memory operations).

I tested passing to thread class the session, the knowledge base and create
session at thread construction time, at thread execution time. I obtain the
same result for all tests.

Oh, yes, if I insert "double a = Math.sqrt(1919) * Math.sqrt(1919);" in the
thread execution without drools code, I can see 100% CPU usage :-)

The only solution that increases CPU usage is the pooling one.

Oh my god!

public class KnowledgeSessionThread extends Thread { 
    
    private static final int iterations = 500; 
    private static final int numberFacts = 1000; 
    private StatefulKnowledgeSession session; 
    
        public KnowledgeSessionThread(StatefulKnowledgeSession sess) throws
Exception { 
                this.session = sess; 
        } 

        public void run() { 
                try { 
                        for( int i = 0; i < iterations; i++ ) { 
                                for( int j = 0; j < numberFacts; j++ ) { 
                                        Message msg = new Message(); 
                                        msg.setMessage("Hello world"); 
                                        msg.setStatus(Message.HELLO); 
                                        session.insert(msg); 
                                }
                        }
                        session.fireAllRules();
                        session.dispose();
                        System.out.println("Thread finished " + 
this.currentThread().getName()); 
                } catch( Exception e ) { 
                        e.printStackTrace(); 
                } 
        } 
} 

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