On Wed, 8 Oct 2003, Neil Conway wrote: > Hey Jeff, > > On Wed, 2003-10-08 at 11:46, Jeff wrote: > > Yeah - like I expected it was able to generate much better code for > > _bt_checkkeys which was the #1 function in gcc on both sun & linux. > > If you get a minute, would it be possible to compare the performance of > your benchmark under linux/gcc and solaris/gcc when PostgreSQL is > compiled with "-O3"? > Sun: gcc: none: 60 seconds -O: 21 seconds -O2: 20 seconds -O3: 19 seconds
suncc: none: 52 seconds -fast: 20 secondsish. -fast is actually a macro that expands to the "best settings" for the platform that is doing the compilation. Linux: -O2: 35 -O3: 40 Odd.. I wonder why it took longer. Perhaps gcc built some bad code? I thought the results were odd there so I ran the test many times.. same results! Swapped the binaries back (so -O2 was running) and boom. back to 35. Sun gcc -O2 and suncc -fast both pass make check. -- Jeff Trout <[EMAIL PROTECTED]> http://www.jefftrout.com/ http://www.stuarthamm.net/ ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
