Profiling nnrpd

[Jeffrey M. Vinocur]

I ran XOVER in various batch sizes on a group with a fair number of holes, 
with nnrpdcheckart: true, tradindexed, tradspool, repeatedly, and 
calculated mean and standard deviation:

xover				
range		mean		+/-
size
1		1587.1s		62.2s
10		 158.9s		 4.1s
100		  16.2s 	 5.4s
1000		  16.6s		 3.7s
10000		  23.5s		 8.9s
38458		  36.1s		19.2s

I suspect that the long times for retrieving the whole group at once may
have some confounding from the fact I used Net::NNTP which parses the
results of XOVER and returns them in a big hash, but I did attempt to 
compensate by *not* letting the garbage collector dispose of the previous 
hashes in the smaller cases.

I guess I should have included 20 in the set of sizes to try, but it's 
reasonable to expect behavior similar to 10, I guess.  So people with trn 
should try rebuilding so it tries batches of 100 instead, perhaps.  (If 
anybody knows trn well enough to tell me how to do that, I can try it 
myself.)

When I get a chance I'll try profiling the above and see where the time is 
going.

-- 
Jeffrey M. Vinocur
jeff at litech.org