[Scons-users] Making some tools run only one at a time

[Bill Deegan]

Tom,

Add a SideEffect() to your builders such that all of them would have the
same file as a sideeffect.
This should prevent more than one from running at a time.
The file doesn't actually have to get created.

-Bill


On Fri, Mar 7, 2014 at 2:48 PM, Plunket, Tom <tom.plunket at aristocrat-inc.com

> wrote:



> Hey gang,

>

> I've searched the archives but haven't come up with anything; apologies

> if this is obvious somewhere but I haven't seen it.

>

> I'm building a data processing pipeline backed by SCons. I've defined a

> few tools to do the things that need to be done but I would like to flag

> a couple of them as "only run one of these at a time."

>

> SCons is the framework that I'm relying on as I split a

> mega-do-everything tool into smaller tools that do different aspects of

> the build job. One stage of the pipeline opens up a heavyweight art

> package and drives an export of the data into a file format that I can

> process elsewhere. Another stage of the pipeline will take a list of

> bitmaps and send them to a video compressor.

>

> It doesn't really matter what the tools are but the problem I'm looking

> to address is that when I multithread my build, it starts with the art

> export and so it fires up eight (on my machine) instances of this

> heavyweight art package when running them serially (or better yet,

> collecting all of the files that need to be exported and then just

> process them all serially in one instance of the tool) would actually be

> prefereable. And then on the video compressor tool, that tool already

> takes advantage of multiple cores so I'd like to only execute those one

> at a time as well. Certianly I could put a wait into the generator but

> that would presumably prevent other things from running.

>

> Is there a way to do this that I've missed? Even maybe something like

> returning from a generator, "not yet, homeboy, wait your turn"?

>

> Thanks.

>

>

>

>

>

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