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[Truffle] STDOUT is sync=true by default #3088

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eregon opened this issue Jun 29, 2015 · 2 comments
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[Truffle] STDOUT is sync=true by default #3088

eregon opened this issue Jun 29, 2015 · 2 comments
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@eregon
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eregon commented Jun 29, 2015

This is just because Rubinius does it in common/io.rb IO#setup.
MRI and JRuby do not and "follow" standard UNIX programs having unbuffered STDERR, but buffered (by line on TTY, by block otherwise) STDOUT (at the FILE* level, see setvbuf(3)).
I am not sure what is best but this could potentially be a IO perf issue.
@eregon eregon added the truffle label Jun 29, 2015
@eregon eregon added this to the truffle-dev milestone Jun 29, 2015
@chrisseaton
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Is there a RubySpec for this?

@eregon
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eregon commented Jan 11, 2016

Not currently, I added them in ruby/spec@70b1140 (will be merged in jruby later)

@eregon eregon closed this as completed Jan 17, 2017
@enebo enebo added this to the Non-Release milestone Dec 7, 2017
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@enebo @eregon @chrisseaton