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Subject: Re: [Merge] lp:~dirk.zimoch/epics-base/named-soft-events into lp:epics-base
From: "Ben F." <ben.franksen@online.de>
To: mp+26190@code.launchpad.net
Date: Wed, 27 Oct 2010 21:52:40 -0000
On Mittwoch, 27. Oktober 2010, Dirk Zimoch wrote:
> I tested long event names like "Event with a very long name number
> 123" (up to 38 chars, the first 35 of them the same for all 255
> events) named-soft-events
>   3.145 seconds
> named-soft-events2
>   2.381 seconds
>
> More or less the same as with short event names. (Numbers vary a bit
> from turn to turn)

Interesting. I'd have expected the ratio between the two versions to 
increase for longer strings. I did some research and found that gcc 
heavily optimises strcmp, resulting (on certain architectures) in 
machine code that uses 16-byte instructions, see

http://stackoverflow.com/questions/1128096/c-string-comparison-in-one-clock-cycle

You learn a bit more every day...

Cheers
Ben
-- 
"Never confuse what is natural with what is habitual."
                                   -- attributed to Mahatma Gandhi
https://code.launchpad.net/~dirk.zimoch/epics-base/named-soft-events/+merge/26190
Your team EPICS Core Developers is requested to review the proposed merge of lp:~dirk.zimoch/epics-base/named-soft-events into lp:epics-base.


References:
Re: [Merge] lp:~dirk.zimoch/epics-base/named-soft-events into lp:epics-base Dirk Zimoch

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