<p dir="ltr">On 26 Feb 2016 9:45 am, "Walter Bright via Digitalmars-d" <<a href="mailto:digitalmars-d@puremagic.com">digitalmars-d@puremagic.com</a>> wrote:<br>
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> On 2/26/2016 12:20 AM, Iain Buclaw via Digitalmars-d wrote:<br>
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>> I thought that mulithreaded I/O did not change anything, or slowed compilation<br>
>> down in some cases?<br>
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>> Or I recall seeing a slight slowdown when I first tested it in gdc all those<br>
>> years ago. So left it disabled - probably for the best too.<br>
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> Running one test won't really give much useful information. I also wrote:<br>
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> "On a machine with local disk and running nothing else, no speedup. With a slow filesystem, like an external, network, or cloud (!) drive, yes. I would also expect it to speed up when the machine is running a lot of other stuff."</p>
<p dir="ltr">Ah ha. Yes I can sort of remember that comment.</p>
<p dir="ltr">One interesting line of development (though would be difficult to implement) would be to do all three semantic passes asynchronously using fibers.</p>
<p dir="ltr">If I understand correctly, sdc already does this with many cases that need ironing out.</p>