[Scons-users] Clone effectiveness

[Hua Yanghao]

Is every call to "Object()" implicitly creates a clone of environment?
I seems like so just want to confirm.
On Thu, Sep 13, 2018 at 9:20 PM Mats Wichmann <mats at wichmann.us> wrote:
>
> On 09/13/2018 12:52 PM, Damien Hocking wrote:
> > We do this too.  Most dlls and sos have a cloned environment.
>
> As I said earlier, we clone lots (>90% of our sconscripts contain a
> Clone() call), but the actual build time dwarfs the "process the
> SConscripts" phase (*) so I don't worry much about it. We're not getting
> killed on memory; I can build easily enough in a 2gb Vagrant-provisioned
> (Linux) image. So while I'd like to *know* the numbers, it's mostly
> curiosity.
>
> Maybe we can resurrect some of the benchmarking/timing code that exists
> in the codebase now to get more info?
>
> * - recent build timings:
> Total build time: 360.533189 seconds  (using scons -j4)
> Total SConscript file execution time: 14.785102 seconds
>
> 15 seconds is slow, but if I sped up the sconscript time by 50%, I'd
> still make no more than a 2% impact on the overall time.
>
> >> On Sep 13, 2018, at 12:27 PM, Pierre-Luc Boily <pierreluc.boily at gmail.com> wrote:
> >>
> >> Hello!
> >>
> >> Just read on the forum :
> >>
> >> /Here's the caveat.
> >> Don't make a gazillion Clone's they're not lightweight.
> >> If you make 100, it won't kill you, if you make 1000's you may start seeing
> >> memory and speed impacted./
> >>
> >> Our project branch contains 800 sconscript files.  From those 800, 300 are
> >> for windows compilation, 500 are for unix compilation.
> >>
> >> We systematically create a clone of the environment at the beginning of
> >> *each *sconscript.  So, if I understand well, it might not be the best
> >> approach.  It would be better to do a Clone only when it is needed?
> >> Reducing the number of clone could potentially speed up the creating of the
> >> tree?
> >>
> >> Thx
> >>
> >>
> >>
> >> --
> >> Sent from: http://scons.1086193.n5.nabble.com/Users-f16930.html
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