> 5-20%, if it were a general slowdown, is _huge_. We have people who work > > for months to get speedups of 1 or 2%.
Yes, I know, that is pretty much all I do at Mozilla ;) I don't think scattered Talos wins of 5-20% are so valuable and important that we should keep sacrificing developer time to debug problems from having the buggy optimization pass. > We should find out whether the Linux distros are using PGO. If they are, > > it would be unwise for us to stop supporting their release As I said, unless they're using the exact same compiler version and environment, we're already not supporting their configuration. C++ compilers are twitchy - much more so with PGO. -David On Thursday, October 11, 2012 7:46:00 AM UTC-7, Gervase Markham wrote: > On 11/10/12 08:54, David Anderson wrote: > > > Keep in mind that debug builds are probably at least an order of > > > magnitude slower (or a large factor), whereas PGO is a very small > > > factor. (After all, we do not PGO on Mac and it doesn't seem to be a > > > problem.) > > > > 5-20%, if it were a general slowdown, is _huge_. We have people who work > > for months to get speedups of 1 or 2%. > > > > We should find out whether the Linux distros are using PGO. If they are, > > it would be unwise for us to stop supporting their release > > configuration, and tell them that the new supported configuration is a > > lot slower... > > > > Gerv _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
