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[aprssig] Re: More on the findU server issue...

Andrew Rich vk4tec at tech-software.net
Sun Sep 25 20:44:38 UTC 2005


Dumb question but........per country findu ?


On Monday 26 September 2005 06:36, scott at opentrac.org wrote:
> > Load balancing works when the problem is the web load, but 
> > that is not the case here. The problem is the database, with 
> > a constant (dozern of packets a second) write pressure on the 
> > database means you need a fast disk array. If you tried to 
> > load-balance with findU, you need a server for every 2 or 
> > three simultaneous requests if you use hard at the level of 
> > the current backup server.
> 
> I was assuming that each machine could run its own database.  I'm pretty
> sure I could tune an Oracle database to do pretty well with that load on
> modest hardware (I've had one logging large chunks of the APRS IS stream,
> but never the whole thing), but that doesn't help you much either.  I don't
> know enough about MySQL to know how you might improve the write performance.
> For writes alone, raw disk throughput shouldn't be that much - I get about 2
> kB/sec from the IS stream, and even assuming a 100x increase to account for
> db overhead and indexes, that's only 200 kB/sec.  My cheap ATA drives
> benchmark in the tens of megabytes/sec.  Is MySQL really that bad with heavy
> writes?  Or is it the concurrent read/write load that kills it?  What's the
> cache hit percentage on reads?
> 
> > My opinions on open source are described on the findU site, 
> > no need to restart the argument here. For five and a half 
> 
> Not arguing, you have every right to keep the code to yourself.  You're
> keeping the code because of potential commercial value, and I'm more than
> willing to contritube on a commercial basis through advertising.  Again,
> it's just a personal philosophy thing.
> 
> Scott
> N1VG
> 
> 
> 
> 
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> 
> 

-- 
------------------------------------
Andrew Rich VK4TEC
Satellite Ground Station for PCSAT2
www.tech-software.net
vk4tec at tech-software.net




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