[SETI@Home] hitparade van 18 mei

dinsdag 19 mei 2009 12:17

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APClll

FP ProMod

[DPC] Team Grazzie

Seti@home

Topicstarter

Aangezien ik gisteren met m'n grote mond riep dat ik graag wilde statsposten, moet ik het natuurlijk ook doen

In dit derde en tevens laatste deel van de serie 'Wat is Astropulse' zijn we aangekomen bij de gebruikte algoritmes. deel 1 deel 2

Astropulse algorithm

Single Pulse Loops
Astropulse has to analyze the whole workunit at nearly 15,000 different DMs (14,208, to be precise.) At each DM, the whole dedispersion algorithm has to be run again for the entire workunit. The lowest DM is 55 pc cm-3, and the highest is 800 pc cm-3. Astropulse examines DMs at regular intervals between those two. Without going into detail about how to examine a piece of a workunit at a given DM, here is the organization with which Astropulse handles the data: it divides the DMs to be covered into large DM chunks of 128 DMs each, and then small DM chunks of 16 DMs each. It divides the data into chunks of 4096 bytes, and processes them one at a time. Once it has dedispersed the data, Astropulse co-adds the dedispersed data at 10 different levels, meaning that it looks for signals of size 0.4 microseconds, then twice that, 4 times, 8 times, and so on. (0.4 microseconds, 0.8, 1.6, 3.2, 6.4, ...) On the lowest level of organization, astropulse looks at individual bins of data. A bin corresponds to 2 bits of the original data, but after dedispersion, it requires a floating point number to represent it. Here's the breakdown of Astropulse's loops:

1 workunit => 111 large DM chunks
1 large DM chunk => 8 small DM chunks
1 small DM chunk => 2048 data chunks
1 data chunk => 16 DMs
1 DM => 10 fold levels
1 fold level => 16384 bins (or less)
1 bin = smallest unit

So each workunit is composed of 111 large DM chunks, each of which is 0.901% of the whole. Each large DM chunk is composed of 8 small DM chunks, each of which is 0.113% of the whole. And so on.

The number of large DM chunks will probably change before the final version of Astropulse is released.

Fast Folding Algorithm
At the end of each small and large DM chunk, Astropulse performs the Fast Folding Algorithm. This algorithm checks for repeating pulses over a certain range of periods. (The period is the length of time after which the pulse repeats.) When the fast folding algorithm is performed after each large DM chunk, it searches over an entire 13 second workunit, and looks for repeating signals with a period of 256 times the sample rate (256 * 0.4 microseconds) or more. When the FFA is performed after each small DM chunk, it searches over a small fraction of the workunit, and looks for repeating signals with a period of 16 times the sample rate or more.

bron

En dan nu natuurlijk het deel waar jullie allemaal voor gekomen zijn

DPC SETI@Home hitparade van 18 mei 2009


Daily Top 30
Flushers: 86 / 999 (8,6 %)
pos		daily	member	total
1.	(3)	23.230	Searchy! Internet Services V.O.F.	9.627.827	(4)
2.	(1)	15.696	[DPC] hansR	15.394.380	(1)
3.	(7)	15.019	[DPC] Switch	9.400.623	(5)
4.	(2)	14.667	Sp@ceNv@der	12.022.727	(3)
5.	(4)	13.453	[DPC]TeamGrazzie	12.863.784	(2)
6.	()	8.275	o25o & Dharkon	4.978.107	(6)
7.	(1)	7.822	F@stmem	2.470.299	(9)
8.	(1)	6.642	[DPC]NGS	73.925	(157)
9.	(11)	6.515	dr bommel	651.736	(32)
10.	(5)	6.117	Ensign Wildfire	3.462.870	(7)
11.	(2)	5.884	dpc_kluizenaar	710.934	(29)
12.	(5)	3.895	Team_Elteor_Borislavj	573.110	(35)
13.	(1)	3.822	AmeComputers	1.902.365	(12)
14.	(3)	3.819	ray	1.405.567	(16)
15.	(19)	3.701	Jox444	954.777	(24)
16.	(12)	2.881	Override	990.449	(23)
17.	(30)	2.484	Racemol	21.190	(312)
18.	(3)	2.311	Wolfje666	81.749	(153)
19.	(1)	2.278	Mr Beamer	1.958.511	(11)
20.	(2)	2.205	muppet99	223.716	(78)
21.	(3)	1.914	Jan Zandvliet & x-RaY99	1.839.812	(13)
22.	(18)	1.894	Tijntje	1.383.295	(17)
23.	(7)	1.840	Dadoke	947.467	(25)
24.	(5)	1.736	apa	256.041	(71)
25.	(1)	1.715	MaGNeT aka BlueTooth76	765.212	(28)
26.	(19)	1.665	RonaldS	204.532	(84)
27.	(2)	1.580	Patty	46.631	(209)
28.	(33)	1.568	Patch	30.843	(258)
29.	(17)	1.504	Ignitions	408.714	(45)
30.	(3)	1.306	holy-shit	620.280	(34)
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Overall Top 30
pos		total	member	daily
1.	()	15.394.380	[DPC] hansR	15.696	(2)
2.	()	12.863.784	[DPC]TeamGrazzie	13.453	(5)
3.	()	12.022.727	Sp@ceNv@der	14.667	(4)
4.	()	9.627.827	Searchy! Internet Services V.O.F.	23.230	(1)
5.	()	9.400.623	[DPC] Switch	15.019	(3)
6.	()	4.978.107	o25o & Dharkon	8.275	(6)
7.	()	3.462.870	Ensign Wildfire	6.117	(10)
8.	()	2.590.764	[DPC]Spinpoint	13	(86)
9.	()	2.470.299	F@stmem	7.822	(7)
10.	()	2.359.891	[DPC]Trancemaus	0	(-)
11.	()	1.958.511	Mr Beamer	2.278	(19)
12.	()	1.902.365	AmeComputers	3.822	(13)
13.	()	1.839.812	Jan Zandvliet & x-RaY99	1.914	(21)
14.	()	1.505.344	[DPC]Team Zuid-Holland	871	(46)
15.	()	1.502.870	MAX3400	0	(-)
16.	()	1.405.567	ray	3.819	(14)
17.	()	1.383.295	Tijntje	1.894	(22)
18.	()	1.136.997	Speedy67 & Friends	0	(-)
19.	()	1.121.475	visvogel	0	(-)
20.	()	1.069.176	[DPC] Anticimex & Lock Metaaldetectie	0	(-)
21.	()	1.060.829	Berkie	38	(81)
22.	()	1.049.597	[DPC]SjoQing	0	(-)
23.	()	990.449	Override	2.881	(16)
24.	()	954.777	Jox444	3.701	(15)
25.	()	947.467	Dadoke	1.840	(23)
26.	()	889.009	Quark	162	(62)
27.	()	830.065	Rydo	1.261	(35)
28.	()	765.212	MaGNeT aka BlueTooth76	1.715	(25)
29.	()	710.934	dpc_kluizenaar	5.884	(11)
30.	()	673.789	Psyed	0	(-)
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Teams Daily Top 15
pos		daily	team	total
1.	()	1.470.388	SETI.USA	1.056.395.391	(1)
22.	(3)	275.781	Canada	158.690.366	(21)
23.	()	264.061	OcUK - Overclockers UK	210.807.607	(15)
24.	(4)	262.844	The Planetary Society	217.626.661	(14)
25.	(1)	224.443	BOINC@Poland	131.629.173	(30)
26.	(4)	212.040	U.S.Air Force	151.355.639	(25)
27.	(12)	205.488	BOINC.Italy	152.510.035	(23)
28.	(1)	204.920	Boone Community School District - Iowa	98.081.219	(39)
29.	(1)	198.645	Dutch Power Cows	137.349.482	(27)
30.	(3)	189.522	Team Art Bell	207.859.443	(17)
31.	(2)	188.456	Team Norway	65.407.827	(52)
32.	(6)	182.277	Amateur Radio Operators	151.599.209	(24)
33.	(4)	178.041	Brasil [SETIBR]	61.022.862	(57)
34.	(1)	175.284	RoEduNet	70.151.693	(48)
35.	(1)	174.249	Ars Technica	153.519.094	(22)
36.	(5)	172.040	2CPU.com	84.661.154	(43)
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Teams Overall Top 15
pos		total	team	daily
1.	()	1.056.395.391	SETI.USA	1.470.388	(1)
20.	()	165.351.677	Phoenix Rising	339.527	(20)
21.	()	158.690.366	Canada	275.781	(22)
22.	()	153.519.094	Ars Technica	174.249	(35)
23.	()	152.510.035	BOINC.Italy	205.488	(27)
24.	()	151.599.209	Amateur Radio Operators	182.277	(32)
25.	()	151.355.639	U.S.Air Force	212.040	(26)
26.	()	148.893.656	BOINC@AUSTRALIA	352.182	(19)
27.	()	137.349.482	Dutch Power Cows	198.645	(29)
28.	()	135.711.607	UK BOINC Team	162.181	(39)
29.	()	134.879.277	Universe Examiners	158.940	(40)
30.	()	131.629.173	BOINC@Poland	224.443	(25)
31.	()	127.484.961	AUSTRIA - NATIONAL - TEAM	146.634	(42)
32.	()	122.518.382	BOINC SETI@home RUSSIA	143.365	(43)
33.	()	120.375.574	PC Perspective Killer Frogs	140.474	(44)
34.	()	118.939.070	Team NIPPON	166.581	(38)
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Megaflush Top 5
pos	Team	Flush	Date
1.	[DPC]TeamGrazzie	553.056	04-01-2008
2.	chelloo.com	261.227	09-01-2008
3.	[DPC]Spinpoint	174.423	14-06-2007
4.	hansR	170.409	17-08-2008
5.	REISinformatiegroep	165.307	18-04-2007
More...