Re: How does compare gcc to VS C++ ?

From: Jason Bowen (no_at_spam.net)
Date: 08/12/04 

Date: Thu, 12 Aug 2004 10:00:35 -0600

John-Paul Stewart wrote:
> Jason Bowen wrote:
>
>> John-Paul Stewart wrote:
>>
>>> Jason Bowen wrote:
>>>
>>>> John-Paul Stewart wrote:
>>>>
>>>>>
>>>>> Then explain to me how you can be certain the observed performance
>>>>> difference can be attributed solely to code generation.
>>>>
>>>>
>>>> It's easy. A compiler can base it's code generation off of a
>>>> target. The knowledge of the target of the compiler builder can
>>>> vary. A compiler can be smart enough to know how to order
>>>> instructions better to enhance cache access or minimize latency
>>>> between instructions based on how long it takes a particular
>>>> instruction to complete.
>>>
>>>
>>> So you're not talking about an *observed* performance difference
>>> based on running the generated code. You're talking about a
>>> *calculated* performance difference based on reading the generated
>>> code and calculating latencies, etc. Correct?
>>
>>
>> I was never comparing an executable running under Windows to one
>> running under Linux. I was talking about the difference in code
>> generated by a couple of compilers. I'm thinking in terms of flat x86
>> instructions.
>
>
> That's all well and good if all you care about is theoretical
> performance, but real-word performance is influenced by far more factors
> than this one. And that's been my point all along.

The intial question was about compilers. It wasn't specific and poorly
asked but it can be a valid question to directly compare the compilers.
  You're right about real-world performance but in the real world
Windows isn't the abomination that everybody always wants to make it out
to be. I run 2000 for work because I had 4 blue screens in XP in a
year. I've never had 2000 die on me, not an exageration nor does it
invalidate any problems others may have had. The last time I had Linux
crash on me was circa 1997 running a 1.2.13 kernel. All my consoles
went zombie on me and I had to manually power the machine off. I'll go
with one crash in 7 years :-).

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