On 11/07/2015 11:27 PM, Tim Chou wrote:
> Hi All,
>
> When I test the DBT2 with a large number of connections, I always get
> the error:
>
> Error in read.table(file = file, header = header, sep = sep, quote =
> quote, :
> no lines available in input
> Calls: read.csv -> read.table
>
> I have tracked the file and see the reason is there are no "TERMINATED"
> in mix.log.
> However, in my observation, driver and client do not close elegantly so
> they cannot quit with sprintf with the "TERMINATED" message (These
> threads are closed by killall command).
>
> 1. How can I solve the problem? (I have checked the bash script and c
> code. I don't know why each thread cannot exit from the main loop after
> the predefined time. It should exit the main loop at time xxxx, which is
> a pre-computed value, according to the code.)
>
> 2. I want to know if my performance is too low.
> No matter how I change the parameters, like creating RAM disk, improving
> the connection number, I always get the similar results.
> Here is one of my test results:
> Hardware: 4-core, 16GB of memory, two disks, and 1Gb ethernet
> Parameters: 10 warehouses, 30 connections.
>
> Response Time (s)
> Transaction % Average : 90th % Total
> Rollbacks %
> ------------ ----- --------------------- ----------- ---------------
> -----
> Delivery 3.00 0.012 : 0.018 7
> 0 0.00
> New Order 41.63 0.006 : 0.008 97
> 0 0.00
> Order Status 5.58 0.003 : 0.004 13 0
> 0.00
> Payment 47.64 0.003 : 0.004 111
> 0 0.00
> Stock Level 2.15 0.005 : 0.007 5
> 0 0.00
> ------------ ----- --------------------- ----------- ---------------
> -----
> 118.78 new-order transactions per minute (NOTPM)
> 0.8 minute duration
> 0 total unknown errors
> 97.0 seconds(s) ramping up
>
> It seems only 2 txns/sec. Is that too low? How can I improve the
> performance?
>
> 3. How can I test the performance in distributed mode?
>
> Looking forward to your replies.
What version of Postgres?
Where did get the DBT2 test?
How did you run the test?
>
> Thanks,
> Tim
--
Adrian Klaver
adrian.klaver@aklaver.com