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Subject: Re: a fatal Shredder 8 hash resizing bug

Author: Dave Gomboc

Date: 17:49:35 03/16/04

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On March 16, 2004 at 10:15:09, William Penn wrote:

>On March 16, 2004 at 02:53:53, Dave Gomboc wrote:
>
>>>>Sounds like there's a defect in the GUI: it shouldn't let you try to change the
>>>>hash table size in mid-search.
>>>>
>>>>Dave
>>>
>>>I think it should be intelligent enough to allow changing the hash size anytime.
>>
>>I strongly doubt the reasonableness of manipulating the hash table in
>>mid-search.  You can do it, but that doesn't make it a good idea.
>>
>>Dave
>
>That's done all the time. Consider what happens when you use the + and - options
>to increase/decrease the number of lines in the engine window in infinite
>analysis mode. That's handled "on the fly" without any problem, and the hash
>table is certainly involved. Prior search results are obviously retained in the
>hash table there after making a change. It doesn't cause a problem with any
>engine, insofar as I'm aware.

Of course it doesn't cause a problem -- the hash table doesn't need to change
configuration when you decide to report PVs for multiple nodes at the root.

You can truncate your hash table in mid-search, but you'll end up with a ton of
hash misses that will drag the efficiency of your search way down.

Dave



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