Re: How do I check the optimisation level of the built-in splitAt? Is something other than -O2 giving me my speed increase?
On Thu, May 15, 2008 at 02:13:32PM +0100, Richard Kelsall wrote: > Bulat Ziganshin wrote: > >Hello Simon, > > > >>It's hard to tell what optimisation level your libraries were compiled > >>with. The default setting is -O, but when building binary distributions > >>we > >>usually set it explicitly to -O2. If you got your binary from another > >>source, they might have only used -O. > > > >not surprising that noone answered this question in cafe :) > > > >actually, main Windows builds goes from Sigbjorn Finne afair. may be > >from Neil too The builds were always done on MSR machines, although Sigbjorn used to bundle them up into installers. These days the MSR machines make the installers too, with a script from Neil. > For the record I'm using the Windows version of GHC 6.8.2 downloaded > from here > > http://haskell.org/ghc/download_ghc_682.html I'm pretty sure that's got the libraries built with -O, although I haven't looked for the log of that actual build. We only use -O2 on the Linux builds as far as I can see, but I'm not sure there's a good reason for that. I also don't know why we don't just make our preferred settings the default in the build system; Simon? Thanks Ian ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: How do I check the optimisation level of the built-in splitAt? Is something other than -O2 giving me my speed increase?
Bulat Ziganshin wrote: Hello Simon, It's hard to tell what optimisation level your libraries were compiled with. The default setting is -O, but when building binary distributions we usually set it explicitly to -O2. If you got your binary from another source, they might have only used -O. not surprising that noone answered this question in cafe :) actually, main Windows builds goes from Sigbjorn Finne afair. may be from Neil too. so we probably need to warn them that their builds may be sub-optimal? Thanks chaps, For the record I'm using the Windows version of GHC 6.8.2 downloaded from here http://haskell.org/ghc/download_ghc_682.html MD5 is 5356a12f056a32ef35fa44db2e2204fc I just downloaded the one that's there currently and it's the same as the one I'm using which I think I downloaded in January. Richard. ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re[2]: How do I check the optimisation level of the built-in splitAt? Is something other than -O2 giving me my speed increase?
Hello Simon, Thursday, May 15, 2008, 1:31:32 PM, you wrote: > It's hard to tell what optimisation level your libraries were compiled > with. The default setting is -O, but when building binary distributions we > usually set it explicitly to -O2. If you got your binary from another > source, they might have only used -O. not surprising that noone answered this question in cafe :) actually, main Windows builds goes from Sigbjorn Finne afair. may be from Neil too. so we probably need to warn them that their builds may be sub-optimal? -- Best regards, Bulatmailto:[EMAIL PROTECTED] ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: How do I check the optimisation level of the built-in splitAt? Is something other than -O2 giving me my speed increase?
Richard Kelsall wrote: Hello Glasgow-Haskell Users, It was suggested to me in this thread in Haskell-Cafe http://www.haskell.org/pipermail/haskell-cafe/2008-May/042797.html which was a subsidiary of a previous thread http://www.haskell.org/pipermail/haskell-cafe/2008-April/042155.html that there might be some reason other than the -O2 optimisation level I applied to my version of splitAt that was making my program run about 30% faster than when I used the built-in splitAt. Can somebody tell me how to check what the -O level is for the built-in splitAt? Or alternatively tell me what the optimisation level is for the libraries. (Sorry I'm not sure of the right terminology for these built-in / library / Prelude things.) It's hard to tell what optimisation level your libraries were compiled with. The default setting is -O, but when building binary distributions we usually set it explicitly to -O2. If you got your binary from another source, they might have only used -O. Cheers, Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
How do I check the optimisation level of the built-in splitAt? Is something other than -O2 giving me my speed increase?
Hello Glasgow-Haskell Users, It was suggested to me in this thread in Haskell-Cafe http://www.haskell.org/pipermail/haskell-cafe/2008-May/042797.html which was a subsidiary of a previous thread http://www.haskell.org/pipermail/haskell-cafe/2008-April/042155.html that there might be some reason other than the -O2 optimisation level I applied to my version of splitAt that was making my program run about 30% faster than when I used the built-in splitAt. Can somebody tell me how to check what the -O level is for the built-in splitAt? Or alternatively tell me what the optimisation level is for the libraries. (Sorry I'm not sure of the right terminology for these built-in / library / Prelude things.) Richard. ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
