I'm doing a load to db, which looks roughly like "read, transform, insert, 
repeat".

Blocking on the inserts leaves the cores sitting cold while they could be 
doing the next read/transform. It's tempting to try an agent for the 
inserts. If I understand them correctly, that would queue the inserts as 
they are ready, allowing the read/transform to continue. I'm concerned that 
this would just fill memory, as the inserts can't keep up with the reads.

Is there some other obvious way to structure this? The only relevant hits 
I've found on this list are about the async lib, which I gather can handle 
this by keeping a bounded queue that can block the producer. I was hoping 
to put off learning the async stuff until later. ;)

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