Author: Uri Blass
Date: 14:00:00 09/03/02
Go up one level in this thread
On September 03, 2002 at 16:12:13, Robert Hyatt wrote: >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 This are the results when I divide the first number by the second number. Note that the second digit after the . is always 0(I calculated manually so you can correct me if I am wrong) 2830/1415=2 2849/1424=2.0007... 3274/1637=2 2308/1154=2 1584/792=2 4294/2147=2 1888/993=1.90... 7275/3637=2.0002... 3940/1970=2 2431/1215=2.0008... 3062/1531=2 2518/1325=1.90... 2131/1121=1.90... 1871/935=2.001... 2648/1324=2 2347/1235=1.90... 4884/2872=1.70... 646/358=1.80... 2983/1491=2.0006... 7473/3736=2.0002... 3626/1813=2 2560/1347=1.90... 2039/1019=2.0009... 2563/1281=2.0007... Uri
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