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73487a60fc
Similar to the previous changes this increases the chance that data frequently needed by GetSnapshotData() stays in l2 cache. In many workloads subtransactions are very rare, and this makes the check for that considerably cheaper. As this removes the last member of PGXACT, there is no need to keep it around anymore. On a larger 2 socket machine this and the two preceding commits result in a ~1.07x performance increase in read-only pgbench. For read-heavy mixed r/w workloads without row level contention, I see about 1.1x. Author: Andres Freund <andres@anarazel.de> Reviewed-By: Robert Haas <robertmhaas@gmail.com> Reviewed-By: Thomas Munro <thomas.munro@gmail.com> Reviewed-By: David Rowley <dgrowleyml@gmail.com> Discussion: https://postgr.es/m/20200301083601.ews6hz5dduc3w2se@alap3.anarazel.de |
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