PGO or not PGO this is the dilemma. Step 2

Profile-guided optimization (PGO) is explained as a two-pass compilation technique: an instrumented build records per-edge execution counters during a training workload, then a second compilation pass uses those counts to drive inlining, branch layout, hot/cold function splitting, whole-binary function reordering, indirect-call promotion, register allocation trade-offs, and switch/jump-table lowering. The piece argues that what matters is the shape of control flow exercised during training, not the actual data values, which is why MySQL Test Run's broad code-path coverage can transfer well to production performance even though its workload looks nothing like TPCC.

Source: https://www.percona.com/blog/pgo-or-not-pgo-this-is-the-dilemma-step-2. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.