Thanks! Let's say there are 10 cores, the workload is not CPU bound, and there is a connection pooler like pgBouncer in place. Would the number of operations more likely be:
1000 ms / total ms per operation * number of cores = 1000 ms / 101 ms * 10 = ~100
1000 ms / total ms per operation * number of connections = 1000 ms / 101 ms * 1000 = ~10000
On Mon, 2023-10-30 at 08:05 -0700, David Ventimiglia wrote: > Can someone help me develop a good mental model for estimating PostgreSQL throughput? > Here's what I mean. Suppose I have: > * 1000 connections > * typical query execution time of 1ms > * but additional network latency of 100ms > What if at all would be an estimate of the number of operations that can be performed > within 1 second? My initial guess would be ~10000, but then perhaps I'm overlooking > something. I expect a more reliable figure would be obtained through testing, but > I'm looking for an a priori back-of-the-envelope estimate. Thanks!
It depends on the number of cores, if the workload is CPU bound. If the workload is disk bound, look for the number of I/O requests a typical query needs, and how many of them you can perform per second.
