Hi, On 2019-05-07 10:28:16 -0700, Peter Geoghegan wrote: > On Tue, May 7, 2019 at 10:06 AM Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > > Given the described test setup, I'd put basically no stock in these > > numbers. It's unlikely that this test case's performance is CPU-bound > > per se; more likely, I/O and lock contention are dominant factors. > > So I'm afraid whatever they're measuring is a more-or-less chance > > effect rather than a real system-wide code improvement. > > Or a compiler bug. Link-time optimizations give the compiler a view of > the program as a whole, not just a single TU at a time. This enables > it to perform additional aggressive optimization. Note that the flags described don't enable LTO. Greetings, Andres Freund
