On Wed, Feb 20, 2019 at 06:32:49PM -0500, Gunther wrote: > Hi, I have an Amazon Linux based Postgresql 11 server here on a t2.medium > EC2 instance. > > Everything flows quite nicely. Except, I don't understand why I can't max > out the CPU or the IO, instead, IO is almost negligible yet the CPU is at > 30% hardly hitting 50%. > avg-cpu: %user %nice %system %iowait %steal %idle 36.41 0.00 3.80 0.00 59.78 > 0.00 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await > r_await w_await svctm %util xvda 0.00 0.00 0.00 7.69 0.00 92.31 24.00 0.02 This is unreadable, please try to attach it ? > previously I had hit 100 %util here, that was when I didn't have the tables > so spread out over so many tablespaces. Now I have it spread out like in the > olden days where you spread out your tables over many "spindles", and I did > this here so I could see which tables or indexes would be bottlenecks. What was the old storage configuration and what is it now ? > So how can it be that queries take quite long without the process running at > higher CPU%? You said everything flows nicely, but take a long time, and "throttled", can you show an high-level performance change ? Other than %cpu or %io. Justin
