But Ted, there *are* good reasons to still optimize CPU, for example when your batch window is shrinking or your real-time volume is dramatically increasing. The programmers before us didn't all necessarily craft their code well, like a case I had recently where two 16Mb COBOL tables were being INITIALIZE'd for every record instead of once at start of program. IMHO, 20+ minutes of CPU time and many hours of elapsed time down to less than 0.5 of one minute of CPU time and 5 minutes of elapsed time (why oh why is MVCL so slow?) is a reasonable payback for the effort.
I agree that I/O is the more common bottleneck, but it isn't always the only one. We are not wasting time to optimize our code whenever we see a problem, if the payback is large enough. It's a judgment call, to be sure, but that's what we're called on to provide to management -- our best judgment. Peter > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Ted MacNEIL > Sent: Monday, September 08, 2008 8:58 PM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: question for C experts - strcpy vs memcpy (fwd) > > >Thanks to all for your thoughts. > >And especially to David for doing a quick test for me. > > I honestly cannot believe that people are still 'optimising' CPU. > > Unless you call major chunks of CPU-intensive code, you are not going > to find enough savings to buy a beer. > > I/O, even with today's faster hardware, is where you should be > concentrating. Especially, on non-Mainframes. This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
