Good morning everyone.
I'm having the following problem with pgbench and test again:
I create a database with a scale of 200 and execute a test (read only) with 40 users and this is the result:
pgbench -U postgres -p 5433 -j 10 -c 40 -T 30 -h 127.0.0.1 -S pgbench
scaling factor: 200
query mode: simple
number of clients: 40
number of threads: 10
duration: 30 s
number of transactions actually processed: 2682306
latency average = 0.446 ms
latency stddev = 0.303 ms
tps = 89329.960851 (including connections establishing)
tps = 89348.642359 (excluding connections establishing)
Then restart the server and when I run the test again the result is really very bad and the IO starts to climb (here the weird thing is that I'm not writing just reading)
scaling factor: 200
query mode: simple
number of clients: 40
number of threads: 10
duration: 30 s
number of transactions actually processed: 6933
latency average = 174.032 ms
tps = 229.842173 (including connections establishing)
tps = 229.870409 (excluding connections establishing)
Can someone give me some suggestions so I can determine what's going on?
PostgreSQL 9.6.2.
Thank you very much for your time.
Regards.