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Re: [RFC]serialize the output of parallel make?

From: Chiheng Xu
Subject: Re: [RFC]serialize the output of parallel make?
Date: Fri, 30 Jul 2010 18:05:40 +0800

On Fri, Jul 30, 2010 at 6:01 PM, Howard Chu <address@hidden> wrote:
> Chiheng Xu wrote:
>> On Fri, Jul 30, 2010 at 5:35 PM, Eli Zaretskii<address@hidden>  wrote:
>>> I asked for an example.  Could you please show a "messy" output and
>>> the output you'd like to have after "serialization"?
>>> TIA
>> serially make : execute  A, B, C programs, they print:
>> A:  Hello, I'm A, I am from Earth.
>> B:  The moon is my home.
>> C:  Welcome to Mars, It's an amazing planet.
>> parallely make : the output of A, B, C programs interleave :
>> C:  Welcome to
>> B:  The moon is my
>> A:  Hello, I'm A, I am from Earth.home.Mars, It's an amazing planet.
> This seems like quite an extreme example. stdout is line buffered by
> default, so individual lines would get written atomically unless the
> programs you're running are doing weird things with their output. In the
> common case interleaving like this doesn't happen within lines, it only
> happens between lines of multi-line output. stderr may skew things since
> it's usually nonbuffered, but again, that's not the common case.

I use "make -j 4" to build and test gcc, the situation above is very common.

Chiheng Xu

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