Epic: Write Throughput — define metrics, define and achieve the objectives

[stepashka]

To prepare for the work on this epic we need to..

• [ ] define and collect the Write Throughput metrics
• [ ] collect the Write Throughput from both zenith and vanilla postgres for comparison and benchmark

Once we start collecting these measurements, we'd set a goal for them for the Technical Preview. Below are the areas on what can help us achieve those goals.

• [ ] WAL record decoding
• [ ] Storing WAL record in in-memory layer
• [ ] In-memory layer flushing
• [ ] Compaction
• [ ] Image layer creation
• [ ] #1359
• [x] #1357
• [x] #1355

[hlinnaka]

Also related:

https://github.com/neondatabase/neon/issues/1773

[shanyp]

@problame this is more than a year old, please see what needs still to be considered

[stepashka]

renamed because we're currenlty post launch that the title was referring to :)