I don't know the implementation details, but in the extreme scenario
you  described, where number of threads is set to 100, but only 1 is
active, because there is only 1 host to crawl, there is not much you
can do - you don't want more than 1 thread hitting the same host.
Sure, in case you do a intranet crawl you wish to have only one thread.


Are you saying the current implementation results in sleeping threads, when in fact they could be fetching pages?


Right, I had some scenarios where many pages was on one host but there was still other hosts and since a lot of threads was sleeping the fetcher was running only with half power.

Stefan



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