ld flag that gives ~40% startup time boost

[John Richard Moser]

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Patrick McFarland wrote:
> On Thursday 22 June 2006 17:09, John Richard Moser wrote:
>> Scott James Remnant wrote:
>>> On Thu, 2006-06-22 at 21:31 +0100, James Laver wrote:
>>>> On a sidenote, I'm rather fond of -O3 where it works (sqlite, for
>>>> example), but i typically go -O2 for most of my compiles.
>>> -O7 gives the best gains, obviously.
>> I dunno, libpng seems to favor -O99...
>>
>> -O3 does things that make binaries load and run slower sometimes, but
>> under some conditions makes them faster.  Among other things I think it
>> unrolls loops (which can cause excessive page faults during looping).
> 
> Which makes an interesting intersection with -Os which goes for smallest 
> optimized code size instead of fastest optimized code size. Apple, of course, 
> uses -Os because it rocks hard on PPC.
> 

- -Os can be faster on x86 too, under some conditions.  I noticed
sometimes things were peppier with it, sometimes not.  Usually there's
nothing really there.

Then again how do you "notice" something these days?  Besides load time
the CPU is rarely touching 100%, which means things are happening in
real time....

>>> Scott
>> --
>> All content of all messages exchanged herein are left in the
>> Public Domain, unless otherwise explicitly stated.
>>
>>     Creative brains are a valuable, limited resource. They shouldn't be
>>     wasted on re-inventing the wheel when there are so many fascinating
>>     new problems waiting out there.
>>                                                  -- Eric Steven Raymond
>>
>>     We will enslave their women, eat their children and rape their
>>     cattle!
>>                   -- Bosc, Evil alien overlord from the fifth dimension
> 

- --
All content of all messages exchanged herein are left in the
Public Domain, unless otherwise explicitly stated.

    Creative brains are a valuable, limited resource. They shouldn't be
    wasted on re-inventing the wheel when there are so many fascinating
    new problems waiting out there.
                                                 -- Eric Steven Raymond

    We will enslave their women, eat their children and rape their
    cattle!
                  -- Bosc, Evil alien overlord from the fifth dimension
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