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Re: [PATCH] core-count: A new program to count the number of cpu cores

From: Giuseppe Scrivano
Subject: Re: [PATCH] core-count: A new program to count the number of cpu cores
Date: Wed, 28 Oct 2009 00:38:38 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (gnu/linux)

Bruno Haible <address@hidden> writes:

> Pádraig Brady wrote:
>> >> Of course this should only apply if its effect is not externally
>> >> observable; if I have a very small file B and a very large file A, and I
>> >> can get
>> >>
>> >>     $ md5sum --threads A B
>> >>     abcdabcdabcdabcdabcdabcdabcdabcd B
>> >>     12341234123412341234123412341234 A
>> >>
>> >> Then the option would be necessary.
>> > 
>> > Good point Paolo.
>> > I think that's another argument for splitting separate files to different 
>> > threads.
>> Grr. An argument for _not_ splitting.
> Huh? You can make md5sum handle each file in parallel and still present the
> output in the order given on the command line. To achieve this, each thread
> will process one file and submit the result to the main thread before exiting.
> The main thread will collect the results and output the result for argument
> k only after the results for 1...k-1 have been collected and output.

The implementation of --threads for md5sum, that I posted some days ago,
collects data for any file before flush it, still it can be improved to
flush immediately when 1..k files are ready.


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