| Re: JBIU update (and testimonial) [message #75477] |
Sat, 12 March 2011 21:09 |
Jeremy Bailin
Messages: 618
Registered: April 2008
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Senior Member |
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On Saturday, March 12, 2011 11:30:14 PM UTC-5, wlandsman wrote:
> On Saturday, March 12, 2011 10:21:35 PM UTC-5, Jeremy Bailin wrote:
>
>> I also thought that you might be entertained by what my boss had to say about MATCH_SPH, once I finally got him to try it out:
>>
>> "Holy shit! I cannot believe how much faster that is than srcor. I kept on
>> putting off reading it in... But I needed to x-correlate 300Kx300K, and it
>> was going to take me days (literally). your routine did it in 5 seconds."
>>
>
> To be fair , he was most likely using a pre-March 2009 version of srcor.pro in the Astron library, which is when it was updated to dramatically improve the speed for spherical matching.
Yeah, probably - I was surprised when he said it was almost 4 orders of magnitude faster, since it was more like a factor of 60-70 in my tests.
-Jeremy.
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| Re: JBIU update (and testimonial) [message #75478 is a reply to message #75477] |
Sat, 12 March 2011 20:30  |
wlandsman
Messages: 743
Registered: June 2000
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Senior Member |
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On Saturday, March 12, 2011 10:21:35 PM UTC-5, Jeremy Bailin wrote:
> I also thought that you might be entertained by what my boss had to say about MATCH_SPH, once I finally got him to try it out:
>
> "Holy shit! I cannot believe how much faster that is than srcor. I kept on
> putting off reading it in... But I needed to x-correlate 300Kx300K, and it
> was going to take me days (literally). your routine did it in 5 seconds."
>
To be fair , he was most likely using a pre-March 2009 version of srcor.pro in the Astron library, which is when it was updated to dramatically improve the speed for spherical matching.
On the other hand, I was just informed about a bug in srcor.pro when the sources are spread over more than half the sky, so maybe it was better to be using a different routine. I'll have an update to srcor.pro soon. --Wayne
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