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When running a lot of large parallel queries concurrently, or a plan with a lot of separate Gather nodes, it is possible to run out of DSM slots. There are better solutions to these problems requiring architectural redesign work, but for now, let's adjust the constants so that it's more difficult to hit the limit. 1. Previously, a DSA area would create up to four segments at each size before doubling the size. After this commit, it will create only two at each size, so it ramps up faster and therefore needs fewer slots. 2. Previously, the total limit on DSM slots allowed for 2 per connection. Switch to 5 per connection. Also remove an obsolete nearby comment. Author: Thomas Munro Reviewed-by: Robert Haas, Andres Freund Discussion: https://postre.es/m/CA%2BhUKGL6H2BpGbiF7Lj6QiTjTGyTLW_vLR%3DSn2tEBeTcYXiMKw%40mail.gmail.com |
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