[Scons-users] Clone effectiveness

[Gary Oberbrunner]

No. It may create an override internally, if you pass some keyword args,
but that's not a clone. So you can call Object() thousands of times for
sure.

-- Gary

On Fri, Sep 14, 2018 at 7:56 AM Hua Yanghao <huayanghao at gmail.com> wrote:

> 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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-- 
Gary
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