Let me explain it in detail. Now I already run a UVM environment. But when I write test case, I met a problem. For example, I firstly start a sequence with my test. And inside this sequence, how can I start a sequence inside an already executing sequence??
If your top level sequence is a virtual sequence (not running on just one sequencer), your test should provide it with handles to the sequencers it needs, so that it can start child sequences running on them.