On Mon, 17 Aug 2009, Chris Quenelle wrote: > > An easy check would be to see if there is a Makefile > glitch of some kind, and you're getting some 32-bit > binaries when you think you're getting 64-bit binaries. > That would run significantly slower on x86. > > Something like: find . -type f | xargs file | grep 32-bit > > It's easy to get this kind of 32/64 problem with Sun compilers > because they default to 32-bit on 64-bit machines,
... on Solaris, whereas on 64 bit Linux they default to 64 bit. > which is the opposite from gcc. > > I'll forward your original email to the x86 compiler team > to see if they have any ideas. > > --chris > > > > Joerg Schilling wrote: >> Chris Quenelle <Chris.Quenelle at sun.com> wrote: >> >>> The Sun Studio team has many performance tests we use to make >>> sure we continue to deliver a 64-bit x86 compiler that has >>> world-class optimization. I can't say anything about your specific >>> test case obviously. Is the "mdigest" program a part of some >>> widely used benchmark or a commonly used open source application? >> >> The program is a wrapper on the message digest implementation from >> FreeBSD/OpenBSD, so it seems to be of general interest. The version I >> am talking about was made portable by me, so it may now be used on many >> places. >> >> >>>> Is there a chance that SunStudio will get better optimization for amd64? >>> I believe our amd64 optimization gets better with each release, >>> although the nature of compiler optimization means that there >>> will always be some give-and-take between releases in any specific app. >> >> I have another higly optimized piece of code (a reed solomon coder) that is >> notably faster when compiled with gcc. In all cases, I see a common tendency: >> the 32 bit binary from SunStudio is faster than the one compiled with gcc and >> the 64 bit binary is slower compared to the binary produced by gcc. >> >> BTW: the reed solomon coder is the latest version of the only free (OSS) >> implementation of a reed solomon coder for CD data sectory. >> >> J?rg >> > > _______________________________________________ > tools-compilers mailing list > tools-compilers at opensolaris.org >
