We are receiving data from GCP pub/sub to app engine. However, as traffic increases, unacked messages in pub/sub are increasing. This seems to be due to the overload of the app engine, so I am trying to increase the specifications. I know that node.js only uses a single core. At this time, I wonder if increasing the cpu core of the app engine will help? (Assuming no clusters are used)
For testing, when I increased the number of cpu cores, it seemed to temporarily reduce unacked messages in pub/sub. I wonder if this is the effect of increasing the cpu core, or if it seemed to be temporarily reduced because of a new deployment.