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Re: Shared memory

From: Thomas Hallgren <thomas(at)tada(dot)se>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Martijn van Oosterhout <kleptog(at)svana(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, PL/Java Development <Pljava-dev(at)gborg(dot)postgresql(dot)org>
Subject: Re: Shared memory
Date: 2006-03-27 18:09:44
Message-ID: 44282A68.7030208@tada.se (view raw or flat)
Thread:
Lists: pgsql-hackers
Tom Lane wrote:
> Thomas Hallgren <thomas(at)tada(dot)se> writes:
>   
>> Tom Lane wrote:
>>     
>>> It's only that much difference?  Given all the other advantages of
>>> separating the JVM from the backends, I'd say you should gladly pay
>>> that price.
>>>
>>>       
>> If I'm right, and the most common scenario is clients using connection pools, then it's very 
>> likely that you don't get any advantages at all. Paying for nothing with a 440% increase in 
>> calling time (at best) seems expensive :-)
>>     
>
> You are focused too narrowly on a few performance numbers.  In my mind
> the primary advantage is that it will *work*.  I do not actually believe
> that you'll ever get the embedded-JVM approach to production-grade
> reliability, because of the fundamental problems with threading, error
> processing, etc.
>   
My focus with PL/Java over the last year has been to make it a 
production-grade product and I think I've succeeded pretty well. The 
current list of open bugs is second to none. What fundamental problems 
are you thinking of that hasn't been solved already?

Regards,
Thomas Hallgren


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