Can I adjust the CPU core number in Tiramisu compiler?

[SubjectNoi]

Env: Ubuntu 18.04, Tiramisu built from source, CPU exec.
Now I wonder can I adjust the core number used by my function?

        // ...

	C.parallelize(i); // Here, is there some API that can change the parallelism of this function? 
                          // So that I can limit the cpu core used by this function
	
	C.vectorize(j, 32);

	C.after(C_init, j1);

        // ...

[SubjectNoi]

Solved, using export HL_NUM_THREADS=4 to adjust the Halide JIT compiler CPU thread limit.