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Subject: Re: DTS article robert hyatt - revealing his bad math

Author: Robert Hyatt

Date: 13:12:13 09/03/02

Go up one level in this thread


On September 03, 2002 at 15:41:05, Gian-Carlo Pascutto wrote:

>On September 03, 2002 at 15:30:51, Matthew Hull wrote:
>
>>There's nothing wrong with the numbers to start with.  The efficiency drop off
>>up to 16 processors looks reasonable.  As for the "too perfect" numbers, it
>>depends on the display software used to create the table.  Especially if one
>>uses FORTRAN or some other software that though you are rounding off, it still
>>wants to pad the display with zeros.
>
>Please look at the actual data. I will post the link in a minute.
>
>--
>GCP


Here it is:


First, times in seconds:

pos     1       2       4       8       16
1       2,830   1,415   832     435     311
2       2,849   1,424   791     438     274
3       3,274   1,637   884     467     239
4       2,308   1,154   591     349     208
5       1,584   792     440     243     178
6       4,294   2,147   1,160   670     452
7       1,888   993     524     273     187
8       7,275   3,637   1,966   1,039   680
9       3,940   1,970   1,094   635     398
10      2,431   1,215   639     333     187
11      3,062   1,531   827     425     247
12      2,518   1,325   662     364     219
13      2,131   1,121   560     313     192
14      1,871   935     534     296     191
15      2,648   1,324   715     378     243
16      2,347   1,235   601     321     182
17      4,884   2,872   1,878   1,085   814
18      646     358     222     124     84
19      2,983   1,491   785     426     226
20      7,473   3,736   1,916   1,083   530
21      3,626   1,813   906     489     237
22      2,560   1,347   691     412     264
23      2,039   1,019   536     323     206
24      2,563   1,281   657     337     178


Next, nodes:

pos     1       2       4       8       16
1       87,735,974      89,052,012      105,025,123     109,467,495
155,514,410
2       88,954,757      90,289,077      100,568,301     110,988,161
137,965,406
3       101,302,792     102,822,332     111,433,074     117,366,515
119,271,093
4       71,726,853      72,802,754      74,853,409      88,137,085
104,230,094
5       49,386,616      50,127,414      55,834,316      61,619,298
89,506,306
6       133,238,718     135,237,296     146,562,594     168,838,428
226,225,307
7       58,593,747      62,602,792      66,243,490      68,868,878
93,575,946
8       225,906,282     229,294,872     248,496,917     261,728,552
340,548,431
9       122,264,617     124,098,584     138,226,951     159,930,005
199,204,874
10      75,301,353      76,430,872      80,651,716      83,656,702
93,431,597
11      95,321,494      96,751,315      104,853,646     107,369,070
123,994,812
12      79,975,416      85,447,418      85,657,884      94,000,085
112,174,209
13      66,100,160      70,622,802      70,796,754      78,834,155
96,053,649
14      58,099,574      58,971,066      67,561,507      74,791,668
95,627,150
15      84,143,340      85,405,488      92,557,676      97,486,065
124,516,703
16      75,738,094      80,920,173      79,039,499      84,141,904
94,701,972
17      154,901,225     184,970,278     242,480,013     279,166,418
416,426,105
18      20,266,629      22,856,254      28,443,165      31,608,146
42,454,639
19      93,858,903      95,266,785      100,527,830     108,742,238
114,692,731
20      231,206,390     234,674,482     241,284,621     271,751,263
264,493,531
21      112,457,464     114,144,324     114,425,474     123,247,294
118,558,091
22      81,302,340      86,865,131      89,432,576      106,348,704
135,196,568
23      63,598,940      64,552,923      68,117,815      81,871,010
103,621,303
24      80,413,971      81,620,179      83,919,196      85,810,169
90,074,814


And finally speedups:

1       1       2.0     3.4     6.5     9.1
2       1       2.0     3.6     6.5     10.4
3       1       2.0     3.7     7.0     13.7
4       1       2.0     3.9     6.6     11.1
5       1       2.0     3.6     6.5     8.9
6       1       2.0     3.7     6.4     9.5
7       1       1.9     3.6     6.9     10.1
8       1       2.0     3.7     7.0     10.7
9       1       2.0     3.6     6.2     9.9
10      1       2.0     3.8     7.3     13.0
11      1       2.0     3.7     7.2     12.4
12      1       1.9     3.8     6.9     11.5
13      1       1.9     3.8     6.8     11.1
14      1       2.0     3.5     6.3     9.8
15      1       2.0     3.7     7.0     10.9
16      1       1.9     3.9     7.3     12.9
17      1       1.7     2.6     4.5     6.0
18      1       1.8     2.9     5.2     7.7
19      1       2.0     3.8     7.0     13.2
20      1       2.0     3.9     6.9     14.1
21      1       2.0     4.0     7.4     15.3
22      1       1.9     3.7     6.2     9.7
23      1       2.0     3.8     6.3     9.9
24      1       2.0     3.9     7.6     14.4
avg     1       2.0     3.7     6.6     11.1


All of the data was produced by a program similar to that which I use to
produce results from things like WAC and so forth.  The program eats the
log files, gathers the nodes, times, scores, etc, and then produces whatever
table I asked it for...



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