On Wed, Jul 26, 2017 at 1:39 PM, Sokolov Yura
<funny.falcon@postgrespro.ru> wrote:
> On 2017-07-24 12:41, Sokolov Yura wrote:
> test_master_1/pretty.log
...
> time activity tps latency stddev min max
> 11130 av+ch 198 198ms 374ms 7ms 1956ms
> 11160 av+ch 248 163ms 401ms 7ms 2601ms
> 11190 av+ch 321 125ms 363ms 7ms 2722ms
> 11220 av+ch 1155 35ms 123ms 7ms 2668ms
> 11250 av+ch 1390 29ms 79ms 7ms 1422ms
vs
> test_master_ring16_1/pretty.log
> time activity tps latency stddev min max
> 11130 av+ch 26 1575ms 635ms 101ms 2536ms
> 11160 av+ch 25 1552ms 648ms 58ms 2376ms
> 11190 av+ch 32 1275ms 726ms 16ms 2493ms
> 11220 av+ch 23 1584ms 674ms 48ms 2454ms
> 11250 av+ch 35 1235ms 777ms 22ms 3627ms
That's a very huge change in latency for the worse
Are you sure that's the ring buffer's doing and not some methodology snafu?