So I'm finally getting the hang of using GSA PS and SB together. And I just wanted to say, the program is simply amazing for using Link Extractor, but you have to do it in the right way. Here's what I've learned:
1) GSA PS allows SB to use "connect" proxies, which results in dramatically higher success / completed URLs than just importing + checking proxies in SB.
2) Using 4x SB instances each at 100 threads only + GSA PS Internal server, results in a whopping 5x more completed URLs processed at 1/5th the threads, 100 threads vs 500 threads, in the same timeframe. For example, my 500 thread non-GSA PS SB's at 500 threads completed only 50-75k URLs before the public proxies died, whereas my SB's with GSA PS and only 100 threads completed 250k+ URLs in the same timeframe.
3) Using GSA PS with SB never "lags out" because it's constantly finding new proxies and importing them, opposed to just importing into SB and having proxies die mid-run.
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There is unfortunately one issue. If you run GSA PS Internal server + SB for a while, GSA PS will be unable to close. Not sure what causes it, but it simply refuses to close the program, even when the SB's have been stopped for a long time. You're forced to ctrl+alt+delete, which removes all new proxies you've added.
The only way to combat this is to do auto-export, AND export all proxies before ctrl+alt+delete. I wish this issue could be fixed, I'm trying to send bug reports every time it happens.