postgres-xc-developers Mailing List for Postgres-XC

Hi, Xiong;

Could you tell me CPU and I/O usage you can measure by sar?   I'm afraid 
load balance is not good in Method 2.   How many backend did you use in 
each coordinator?   Did you have any warning that connection overflew in 
data nodes?

Also, how long warm-up did you have?

I'll let you know our configuration (sorry please let me have a bit).

Regards;
---
Koichi Suzuki

(2010年11月24日 14:40), xiong wang wrote:
> Hi Mason,
> I tested it by 5 PCs.
> The enviroment as follows:
> 2 PCs,  one datanode and one coordinator together on each of them,
> GTM is on another PC,
> 2 Loaders are on other 2 PCs.
> Network 1G.
>   I tested Postgres-XC in two methods as follows:
> Method 1.
> loader -------- coordinator & datanode
>                                                       \
>                                                           GTM
>                                                       /
> loader -------- coordinator & datanode
> Method 2.
> loader-------- coordinator & datanode
>            \      /                                    \
>              \  /                                        \
>               /\                                             GTM
>             /   \                                         /
>           /       \                                     /
> loader -------- coordinator & datanode
> The DBT1 test results in these two methods are very different. Method 1
> is much better than Method 2. I don't know why.
> If I test Postgres-XC in Method 1, the DBT1 performance is close to what
> the document declares. If I test it in Method 2, the result is much
> worse than what the document writes. Could you tell me why the two
> methods have so much effect on the DBT1 performace.
> Thanks,
> Regards,
> Benny
>  >How much worse?
>  >How many physical servers are in each configuration? How is each server
>  >configured in each, with how many data nodes? What kind of network?
>  >Gigabit?
>  >Or was everything on one system? With virtual machines or without and
>  >just using different ports?
>  >Are there errors in the log file (connection limits hit)?
>  >Regards,
>  >Mason
>
>
>
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Hi Mason,

I tested it by 5 PCs.

The enviroment as follows:

2 PCs,  one datanode and one coordinator together on each of them,
GTM is on another PC,
2 Loaders are on other 2 PCs.
Network 1G.


 I tested Postgres-XC in two methods as follows:

Method 1.

loader -------- coordinator & datanode
                                                     \
                                                         GTM
                                                     /
loader -------- coordinator & datanode


Method 2.
loader-------- coordinator & datanode
          \      /                                    \
            \  /                                        \
             /\                                             GTM

           /   \                                         /
         /       \                                     /
loader -------- coordinator & datanode


The DBT1 test results in these two methods are very different. Method 1 is
much better than Method 2. I don't know why.

If I test Postgres-XC in Method 1, the DBT1 performance is close to what
the document declares. If I test it in Method 2, the result is much worse
than what the document writes. Could you tell me why the two methods have so
much effect on the DBT1 performace.

Thanks,

Regards,
Benny

>How much worse?

>How many physical servers are in each configuration? How is each server
>configured in each, with how many data nodes? What kind of network?
>Gigabit?

>Or was everything on one system? With virtual machines or without and
>just using different ports?

>Are there errors in the log file (connection limits hit)?

>Regards,

>Mason