<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I recall reading a paper back in the early 2000 era about Google's finding as they were the first folks to build out extremely large linux based server farms.<div>Their comment was even tho we ordered oh say 1000 machines from vendor X and they were technically "identical" and we ran the same bit identical software we found that there was always a few percent that behaved differently. Due to issues with hard drive, memory, or the fact the vendor changed suppliers for some particular week, karma or cosmic rays? </div><div><br></div><div>The uptake was even if two machines were the "same" and the software bit identical, behaviour might be different. Sometimes this was explainable, other times, Karma? </div><div><br></div><div><br></div><div><div><div>On 2011-02-02, at 12:35 PM, Eliot Miranda wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><br><br><div class="gmail_quote">On Wed, Feb 2, 2011 at 11:39 AM, David T. Lewis <span dir="ltr"><<a href="mailto:lewis@mail.msen.com">lewis@mail.msen.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Sorry to keep replying to myself, but one more followup. In each case<br>
for which differences exists after stripping the symbol table, the<br>
difference is due to a date stamp string.<br>
<br>
In the case of sqUnixMain.c, it is the VM_BUILD_STRING macro used in<br>
getAttribute(). The version.c file contains also a date string. Both<br>
of these date strings are created by configure. After accounting for<br>
these and after stripping the the symbol tables, I see no remaining<br>
differences in executable code.<br>
<br>
I can't explain why the compiler might generated different symbol<br>
tables, but given that the resulting executables end up being identical<br>
except for the date string macros, this does not look like an issue<br>
that would affect run time stability.<br></blockquote><div><br></div><div>Agreed. Looking more carefully this morning using -save-temps to save the post-processed .i and output .s I see that all differences are valid. Thanks David!</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div class="h5"><br>
</div></div></blockquote></div></blockquote></div><br><div>
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