[Scons-users] Improve speed of windows environment

[Pierre-Luc Boily]

Le mar. 23 avr. 2019, à 16 h 44, Bill Deegan <bill at baddogconsulting.com> a
écrit :

> The tool isn't Object, but what type of tool creates an object.
> Note my email said
> env=Environment(tools=[only the tools you're using],...)
> not
> env=Environment(tools=[],)
>

I know, I just wanted to do some test for my own comprehension =)


> Also why are you using: SCons.Environment.Environment  instead of
> Environment() ?
>

Is it incorrect?   My SConstruct looks like this :
https://pastebin.com/SwB7GkGT.  He is really neat and clean.  All the logic
is in SConscriptManager and if I try to use only Environment call (without
the SCons.Environment) scons is complaining that he doesn't know about
Environment (NameError: name 'Environment' is not defined)


> In your case it looks like you need all of MSVC (at least) so:
> sconsEnv = Environment(MSVC_VERSION = '10.0', TARGET_ARCH = 'x86',
> tools=['msvc','mslink','mslib'])
>

Ok thx,this works, but unfortunately, I have absolutely no performance
gain.  Just as a matter of test, if I use   Environment(MSVC_VERSION =
'10.0', TARGET_ARCH = 'x86', tools=[]), I can clearly see an improvement.
It takes around 600ms to create the environment.  But soon as I add only 1
tool, it goes back to 1500ms.  It looks like it doesn't make any difference
having 1 or 15 tools.. weird...

Well, I guess I have to live with windows drawback to being bad with
starting process!!  I recently did a huge change in our scons
implementation to load only needed sconscript.  For same code base, I went
from :
SConstruct  took 16660.409 ms
to this
SConstruct  took 1500 ms

Which is already an awesome improvement.... But you know, more you have,
more you want =)



>
> Give that a try.
> -Bill
>
> On Tue, Apr 23, 2019 at 1:48 PM Pierre-Luc Boily <
> pierreluc.boily at gmail.com> wrote:
>
>> Ok, I tried  your solution but scons complains that Object doesn't exist,
>> (which is normal I know).  2 Stupids questions:
>>
>> 1- What is the difference between tools and builders in the environment?
>> By doing this :
>> DefaultEnvironment(tools=[])
>> env=Environment(tools=[],...)
>>
>> both tools and builders are now empty.
>>
>> 2- I need env.Object, env.Library env.Program, but those are gone from
>> the BUILDERS section.  How to I add them when I create the Environment?
>> Tried this, but that doesn't work :
>> sconsEnv = SCons.Environment.Environment(MSVC_VERSION = '10.0',
>> TARGET_ARCH = 'x86', tools=['Object'])
>>
>> Thank you very much!
>>
>> Pierre-Luc
>>
>>
>> Le mar. 23 avr. 2019, à 10 h 54, Bill Deegan <bill at baddogconsulting.com>
>> a écrit :
>>
>>> Yes.
>>> This has long been the case.
>>> Launching processes in Windows is MUCH slower than linux.
>>> When SCons starts up it tries to load all the default tools.
>>> This involves launching numerous processes to see what tools are
>>> available and also which version(s)
>>> You can speed this up by only loading the tools you're using on windows.
>>>
>>> Do you only use env.Program() or do you also use Program() (which uses
>>> the DefaultEnvironment())
>>> So:
>>> DefaultEnvironment(tools=[])
>>> env=Environment(tools=[only the tools you're using],...)
>>>
>>> Should help.
>>>
>>> -Bill
>>>
>>>
>>>
>>> On Tue, Apr 23, 2019 at 10:07 AM Pierre-Luc Boily <
>>> pierreluc.boily at gmail.com> wrote:
>>>
>>>> Hello!
>>>>
>>>> I just realized that the creation of an environment is faster under
>>>> centos
>>>> compared to windows 10.  See below Dump trace with --deubg=time
>>>> arguments :
>>>>
>>>> Centos : https://pastebin.com/UPggyDcj
>>>> Windows : https://pastebin.com/11YzKNDH
>>>>
>>>> I already read somewhere that tool creation is time consuming, but both
>>>> centos\windows environments looks similar to be regarding tools..  So, I
>>>> don't know why windows takes 1500 ms compare to 300ms for centos.
>>>>
>>>> Any idea?
>>>>
>>>> thx!
>>>>
>>>>
>>>>
>>>> --
>>>> Sent from: http://scons.1086193.n5.nabble.com/Users-f16930.html
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