Re: Random hang during commit

Lin, B (Bill) wrote:
> >Does that mean 8.1.3 works fine on other PCs you have, but not this
> one?
> Yes, it is works fine with other PCs which do not have dual processor.
> (I can not find another machine has dual processor here)

Ah, does your problem match what is being discussed here?
http://archives.postgresql.org/pgsql-performance/2006-03/msg00032.php

>> If so, that suggests to me that there must be either:
>> 1. A different library on the problem machine.
> No, same library are used.
>> 2. Some process (firewall/antivirus) that is occasionally interfering
> with communication.
> No firewall/antivirus was running
>
>> Three things suggest themselves to me:
>> 1. Make sure there aren't any known issues with the jdbc driver version
> you have http://jdbc.postgresql.org/
> Seems not, but not sure about this one:
> http://jdbc.postgresql.org/todo.html#Known+Bugs
> [bugs] Deallocating large numbers of server side statements can break
> the connection by filling network buffers. This is a very, very low
> probability bug, but it is still possible.

Hmm - doesn't sound like that's it.

> Actually, if using jdbc driver version 7.4 against database 8.1.3, this
> problem will not happen.
> It seems it is a bug relate with jdbc driver for a dual processor.

Or possibly lower down even.

>> 2. Check if there is anything unusual about the problem machine
> Nothing unusual
>> 3. Try running the client on the problem machine and the database on
> another, then the other way around. Does this change anything?
> I tried both way and this problem seems never happen.

Hmm - I'd have expected it to fail in one direction but not the other.
--
Richard Huxton
Archonet Ltd