BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Delphi + Hyperthreading problems          BorlandTalk.com Forum Index -> Delphi Non-Technical View previous topic :: View next topic   Author Message Andy Guest Posted: Fri Jul 23, 2004 3:47 am    Post subject: Delphi + Hyperthreading problems Hi All, is there anything I need to do or beware of when writing a program which will be used on a pc with a hyperthreading processor. I have a program I wrote which works fine in XP with older processors but refuses to run (ie get the send error report to MS message) on pc's with late model processors. If I disable the hyperthreading my program works fine. Program is in D7pro/ ADO/ Access2k Are there any compiler options etc I need to set. Any help is appreciated. Andy Back to top robin@ozsoft.com.au Guest Posted: Fri Jul 23, 2004 5:56 am    Post subject: Re: Delphi + Hyperthreading problems Andy wrote: Quote: Hi All, is there anything I need to do or beware of when writing a program which will be used on a pc with a hyperthreading processor. I have a program I wrote which works fine in XP with older processors but refuses to run (ie get the send error report to MS message) on pc's with late model processors. If I disable the hyperthreading my program works fine. Program is in D7pro/ ADO/ Access2k Are there any compiler options etc I need to set. Any help is appreciated. Andy Hi Andy, I don't know about Delphi in particular, but Interbase 6 has issues with slow initial connection on multiple processor/hyperthreding processor computers. It does work, just takes a little while. (There is a regestry setting which can fix that also). Back to top Lord Crc Guest Posted: Fri Jul 23, 2004 11:46 am    Post subject: Re: Delphi + Hyperthreading problems On Fri, 23 Jul 2004 13:17:42 +0930, "Andy" <Andy (AT) no (DOT) mail.please> wrote: Quote: is there anything I need to do or beware of when writing a program which will be used on a pc with a hyperthreading processor. Your program must be multithread safe, which it should be anyway. However multithreading bugs seem to surface a lot sooner when you actually got multiple cpus running the code. So, if you got threads, make sure they're accessing things correctly. - Asbjørn Back to top Craig Stuntz [TeamB] Guest Posted: Fri Jul 23, 2004 12:18 pm    Post subject: Re: Delphi + Hyperthreading problems [email]robin (AT) ozsoft (DOT) com.au[/email] wrote: Quote: I don't know about Delphi in particular, but Interbase 6 has issues with slow initial connection on multiple processor/hyperthreding processor computers. It does work, just takes a little while. I'm close to certain this won't be the cause of the problems he's experiencing with his Access 2000 app. -CRaig -- Craig Stuntz [TeamB] . Vertex Systems Corp. . Columbus, OH Delphi/InterBase Weblog : http://blogs.teamb.com/craigstuntz Please read and follow Borland's rules for the user of their news server: http://info.borland.com/newsgroups/guide.html Back to top Dan Downs Guest Posted: Fri Jul 23, 2004 2:47 pm    Post subject: Re: Delphi + Hyperthreading problems Quote: I have a program I wrote which works fine in XP with older processors but refuses to run (ie get the send error report to MS message) on pc's with late model processors. If I disable the hyperthreading my program works fine. Program is in D7pro/ ADO/ Access2k Are there any compiler options etc I need to set. Any help is appreciated. Older versions of the JCL/JVCL had issues with hyperthreaded cpus. Could be a component pack that is detecting cpu speed/specs/etc.. DD Back to top softcoder Guest Posted: Fri Jul 23, 2004 3:48 pm    Post subject: Re: Delphi + Hyperthreading problems I wrote a real-time daytrading app in BCB5 a couple years ago. First customer that had hyperthreading and first customer that had multi-processors revealed missing critical sections and mutexes are the access of shared data in my threads. This was the primary reason for all the problems I had expereinced and was finally resolved after careful logging etc.. "Andy" <Andy (AT) no (DOT) mail.please> wrote Quote: Hi All, is there anything I need to do or beware of when writing a program which will be used on a pc with a hyperthreading processor. I have a program I wrote which works fine in XP with older processors but refuses to run (ie get the send error report to MS message) on pc's with late model processors. If I disable the hyperthreading my program works fine. Program is in D7pro/ ADO/ Access2k Are there any compiler options etc I need to set. Any help is appreciated. Andy Back to top Martin Harvey (Demon Acco Guest Posted: Fri Jul 23, 2004 6:13 pm    Post subject: Re: Delphi + Hyperthreading problems On Fri, 23 Jul 2004 13:17:42 +0930, "Andy" <Andy (AT) no (DOT) mail.please> wrote: Quote: Hi All, is there anything I need to do or beware of when writing a program which will be used on a pc with a hyperthreading processor. Yes - there are potential issues with resource starvation between the two threads scheduled to run on a single CPU. Basically, if one of the threads busy waits (even doing a sleep(0) or "yeild"), then it can cause serious performance problems for other threads scheduled on the CPU. Quote: I have a program I wrote which works fine in XP with older processors but refuses to run (ie get the send error report to MS message) on pc's with late model processors. This looks more like changes made to modern CPU's to improve security requirements. ISTR someone mentioning something in some groups about running a program in "windows 95 compatibility mode" ?? Just a thought. Quote: If I disable the hyperthreading my program works fine. If you can find an O.S switch to get that particular program to run, rather than completely disablibg hyperthreading that would probably be preferable. MH. Back to top Andy Guest Posted: Fri Jul 23, 2004 8:55 pm    Post subject: Re: Delphi + Hyperthreading problems Hi Dan, I think you may have hit the nail on the head - I do use jvcl 2.1 I made a small sample app and as soon as I added any jvcl data-aware components the problem occurred. Will try installing jvcl 3 and see if that solves the problem. Thanks Andy "Dan Downs" <ddowns (AT) nospam (DOT) online-access.com> wrote Quote: I have a program I wrote which works fine in XP with older processors but refuses to run (ie get the send error report to MS message) on pc's with late model processors. If I disable the hyperthreading my program works fine. Program is in D7pro/ ADO/ Access2k Are there any compiler options etc I need to set. Any help is appreciated. Older versions of the JCL/JVCL had issues with hyperthreaded cpus. Could be a component pack that is detecting cpu speed/specs/etc.. DD Back to top Robert Rossmair Guest Posted: Sun Jul 25, 2004 9:54 pm    Post subject: Re: Delphi + Hyperthreading problems Hi, Andy wrote: Quote: Hi Dan, I think you may have hit the nail on the head - I do use jvcl 2.1 I made a small sample app and as soon as I added any jvcl data-aware components the problem occurred. The cause of the problem is JclSysInfo.GetCpuSpeed, which is (needlessly) called during JclGraphUtils initialization. The most simple fix is to replace the first instruction in JclGraphUtils.SetupFunctions: // GetCpuInfo(CpuInfo); CpuInfo := CPUID; so that GetCpuSpeed won't be called there. Note: This bug is fixed (among many others) in the latest JCL release 1.91. Greetings, Robert Back to top Andy Guest Posted: Sun Jul 25, 2004 10:54 pm    Post subject: Re: Delphi + Hyperthreading problems THANKYOU Robert, That fixed the problem. Andy "Robert Rossmair" <Robert.Rossmair (AT) gmx (DOT) net> wrote Quote: Hi, Andy wrote: Hi Dan, I think you may have hit the nail on the head - I do use jvcl 2.1 I made a small sample app and as soon as I added any jvcl data-aware components the problem occurred. The cause of the problem is JclSysInfo.GetCpuSpeed, which is (needlessly) called during JclGraphUtils initialization. The most simple fix is to replace the first instruction in JclGraphUtils.SetupFunctions: // GetCpuInfo(CpuInfo); CpuInfo := CPUID; so that GetCpuSpeed won't be called there. Note: This bug is fixed (among many others) in the latest JCL release 1.91. Greetings, Robert Back to top Andrew Guest Posted: Mon Jul 26, 2004 3:42 am    Post subject: Re: Delphi + Hyperthreading problems Quote: I don't know about Delphi in particular, but Interbase 6 has issues with slow initial connection on multiple processor/hyperthreding processor computers. It does work, just takes a little while. (There is a regestry setting which can fix that also). Hi Robin, You don't know the specifics of that Registry setting do you? My team is about to migrate our IB6 app to Firebird because of the slow connect issue. A fix would let us put off the migration indefiitely... Thanks, Andrew Back to top robin@ozsoft.com.au Guest Posted: Mon Jul 26, 2004 4:36 am    Post subject: Re: Delphi + Hyperthreading problems Andrew wrote: Quote: I don't know about Delphi in particular, but Interbase 6 has issues with slow initial connection on multiple processor/hyperthreding processor computers. It does work, just takes a little while. (There is a regestry setting which can fix that also). Hi Robin, You don't know the specifics of that Registry setting do you? My team is about to migrate our IB6 app to Firebird because of the slow connect issue. A fix would let us put off the migration indefiitely... Thanks, Andrew Hi Andrew, Before I progress, I am not an expert! The file (A registry edit) is located on the below link with a brief explanation http://codecentral.borland.com/codecentral/ccweb.exe/listing?id=16665 What this does is specify which processor (Or virtual processor with HyperThreading) for Interbase to use. It fixes this issue on NT4 or better OS. I hope this helps! Robin. Back to top Andrew Guest Posted: Tue Jul 27, 2004 1:05 am    Post subject: Re: Delphi + Hyperthreading problems [email]robin (AT) ozsoft (DOT) com.au[/email] wrote: Quote: Hi Andrew, Before I progress, I am not an expert! The file (A registry edit) is located on the below link with a brief explanation http://codecentral.borland.com/codecentral/ccweb.exe/listing?id=16665 What this does is specify which processor (Or virtual processor with HyperThreading) for Interbase to use. It fixes this issue on NT4 or better OS. I hope this helps! Robin. Yes, it does! Thanks. 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