I wrote: > I tried this test on a newer CPU, and 0003 had no regression. Both > systems used gcc 11.2. Rather than try to figure out why an experiment > had unexpected behavior, I plan to test 0001 and 0002 on a couple > different compilers/architectures and call it a day. It's also worth > noting that 0002 by itself seemed to be decently faster on the newer > machine, but not as fast as 0001 and 0002 together.
I tested four machines with various combinations of patches, and it seems the only thing they all agree on is that 0002 is a decent improvement (full results attached). The others can be faster or slower. 0002 also simplifies things, so it has that going for it. I plan to commit that this week unless there are objections. -- John Naylor EDB: http://www.enterprisedb.com
haswell xeon / gcc 8 master: Time: 608.047 ms Time: 2859.939 ms (00:02.860) Time: 2255.402 ms (00:02.255) 0001 only: Time: 603.026 ms Time: 3077.163 ms (00:03.077) Time: 2377.189 ms (00:02.377) 0002 only: Time: 615.444 ms Time: 2388.939 ms (00:02.389) Time: 2227.665 ms (00:02.228) 0001-0002: Time: 608.757 ms Time: 2746.711 ms (00:02.747) Time: 2156.545 ms (00:02.157) 0001-0003: Time: 609.236 ms Time: 1466.130 ms (00:01.466) Time: 1353.658 ms (00:01.354) power8 / gcc 4.8 master: Time: 559.375 ms Time: 7336.079 ms (00:07.336) Time: 5049.222 ms (00:05.049) 0001 only: Time: 559.466 ms Time: 7272.719 ms (00:07.273) Time: 4878.817 ms (00:04.879) 0002 only: Time: 555.255 ms Time: 6061.435 ms (00:06.061) Time: 4440.829 ms (00:04.441) 0001-0002: Time: 555.144 ms Time: 5378.270 ms (00:05.378) Time: 5745.331 ms (00:05.745) 0001-0003: Time: 554.707 ms Time: 2189.187 ms (00:02.189) Time: 2193.870 ms (00:02.194) comet lake / gcc 11 master: Time: 383.196 ms Time: 2323.875 ms (00:02.324) Time: 1866.594 ms (00:01.867) 0001 only: Time: 379.193 ms Time: 2046.540 ms (00:02.047) Time: 1720.601 ms (00:01.721) 0002 only: Time: 374.072 ms Time: 1769.163 ms (00:01.769) Time: 1485.612 ms (00:01.486) 0001-0002: Time: 374.454 ms Time: 1208.933 ms (00:01.209) Time: 1018.236 ms (00:01.018) 0001-0003: Time: 376.698 ms Time: 1278.807 ms (00:01.279) Time: 1177.005 ms (00:01.177) 3-year old core i5 / gcc 11 master: Time: 378.955 ms Time: 2329.763 ms (00:02.330) Time: 1891.931 ms (00:01.892) 0001 only: Time: 384.547 ms Time: 2342.837 ms (00:02.343) Time: 1906.436 ms (00:01.906) 0002 only: Time: 379.096 ms Time: 2051.755 ms (00:02.052) Time: 1641.376 ms (00:01.641) 0001-0002: Time: 377.758 ms Time: 1293.624 ms (00:01.294) Time: 1096.991 ms (00:01.097) 0001-0003: Time: 377.767 ms Time: 2052.826 ms (00:02.053) Time: 1329.185 ms (00:01.329)
