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Subject: Re: [boost] [afio] Formal review of Boost.AFIO
From: Thomas Heller (thom.heller_at_[hidden])
Date: 2015-08-31 10:50:26

On 08/31/2015 04:25 PM, Niall Douglas wrote:
> On 31 Aug 2015 at 1:38, Thomas Heller wrote:
>> On 08/30/2015 10:06 PM, Niall Douglas wrote:
>>> 7. future.wait() very rarely blocks in your use scenario i.e. most if
>>> not nearly all the time the future is ready. If you are blocking, the
>>> cost of any thread sleep will always dwarf the cost of any future.
>> Is this really an assumption that holds when dealing with operations
>> that do file I/O? I have a hard time believing this is the general case.
> Imagine the copying of a 10Mb file in 1Mb segments. You would create
> a minimum of 11 future-promise pairs, and only wait on the very last
> one.
> My own benchmarking here suggested that (much) lighter weight futures
> would let me implement a much more efficient ASIO reactor than ASIO's
> and push all potential blocking to outside AFIO, perhaps right down
> to the final end user layer. Perhaps thousands of future-promise
> pairs might be created, continued from and destroyed between actual
> thread blocks. This is why I believe - currently without real world
> proof - this ought to be a big win.

How does this answer my question?

> Niall
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Thomas Heller
Friedrich-Alexander-Universität Erlangen-Nürnberg
Department Informatik - Lehrstuhl Rechnerarchitektur
Martensstr. 3
91058 Erlangen
Tel.: 09131/85-27018
Fax:  09131/85-27912
Email: thomas.heller_at_[hidden]

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