On 9/5/23 10:51 AM, David Raymond wrote:
I've noticed that CPU usage for queries seems to have drastically increased going from psycopg2 to psycopg3. In psycopg2 a connection would sit quietly while waiting for the results, using next to no CPU. In psycopg it looks like the threads are using their core at full power, continuously checking for the result as fast as possible, and never sleeping or relaxing. See below for a simple example script. During the psycopg2 part while the 8 threads are waiting on results my processor usage sits at the normal idling 2-3%. But in the psycopg3 part, while the 8 threads are waiting on results my processor usage jumps up to 62-63% or so. Is there a setting or configuration I'm missing?
Take a look at this: https://github.com/psycopg/psycopg/issues/448 It seems to be related.
This is on Windows, where I install with "pip install psycopg2-binary" and "pip install psycopg[binary]" Current versions shown by pip list: psycopg 3.1.10 (This gets installed even when telling it to install psycopg[binary]) psycopg-binary 3.1.10 psycopg2-binary 2.9.7 And their reported .__version__ psycopg.__version__: 3.1.10 psycopg2.__version__: 2.9.7 (dt dec pq3 ext lo64) I've got several scripts where I open up multiple connections to multiple servers and run a number of queries on them, where 98% of my machine's time should be just relaxing and waiting for the server to finish the next 1 to 15 minute long query. I don't need to continue the very microsecond the query completes. Is there anything I can do to bring CPU usage back down with psycopg (3) ?
Thank you,
