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Joined: Feb 2002
Posts: 950
Hacker
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Hacker
Joined: Feb 2002
Posts: 950 |
Let me just say my experience with persistant connections did not work out. I have two Threads systems on my dual xeon processor dell server with 2gb of ram. I fugred persistant would be good. I was very wrong.
SHOW STATUS showed hundreds of connections, many waiting on a timeout. 100% memory usage and about 1.5gb of swap usage. My server went from 2,000 queries/min to its current level of around 6,000 queries/min and persistant connections was a real bad idea.
Just in case anyone else was considering it - it would seem that high traffic sites should avoid this.
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Joined: Apr 2002
Posts: 1,768
Addict
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Addict
Joined: Apr 2002
Posts: 1,768 |
I'd like to see an explanation of exactly how a persistent connection works, as opposed to a non-persistent connection.
1) What processing is performed when creating/destroying a non-persistent connection?
2) What processing is performed when re-using a persistent connection?
3) How much resources (memory, disk space, etc.) does a "connection" take?
4) When using persistent connections, is there any risk of users getting data intended for a different user?
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Joined: Dec 2000
Posts: 1,471
Addict
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Addict
Joined: Dec 2000
Posts: 1,471 |
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Joined: Oct 2002
Posts: 165
Member
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Member
Joined: Oct 2002
Posts: 165 |
Is this Persistant option you refer to the one within UBBT config or in my.cnf file?
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Joined: Feb 2002
Posts: 950
Hacker
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Hacker
Joined: Feb 2002
Posts: 950 |
UBBT.... I will say that the persistant feature *may* be benefitial on smaller sites; its just that I run a Dual Xeon processor machine with 2GB of RAM and the hundreds of processes running killed my server.
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