There is 1p, 3p ,5p attribute for elsarticle. How could I determine which model should be used? Could you tell me where can I find out the model of all elsevier journals?
According to the documentation, the options to use for article submission are
review. Hence, you do not need to know the journal's model to submit. If your article is accepted for publication, the journal should send you instructions on final formatting. If they don't, then you can just ask your copy editor which option you should use. Even if you knew the relevant model, the journal will not want that model used for initial submission and review. (And may well send it straight back to you if you submit in that format.)
The 1, 3 and 5 refer to the paper size: 165x240mm, 192x262mm and 210x280mm respectively. Just download a PDF or get a hard copy from the library for your journal and check its dimensions.
As cfr points out, you're not expected to submit your manuscript in the final print layout of the journal. It's usually a lot easier for editors and reviewers if you use one column (for online readability) and your standard paper size (for printing).
Note that the dimensions given in the documentation refer to the text area, not the paper size. The paper size is A4 (210 mm × 297 mm) in all cases.
The class file literally invokes the
geometry package where
paperheight are set to the A4 values, while
textwidth are set to the numbers given in the documentation: 562pt and 384pt, respectively, for 1p, 622pt and 468pt for 3p, and 682pt and 522pt for 5p. So in principle all you have to do is download an article from the journal of interest and look at the text area. Elsevier provides samples of the three formats, e.g. here, called elstest-1p.pdf, elstest-3p.pdf, and elstest-5p.pdf. They do look pretty different from each other; it should be obvious even without measurement which format is used by your journal:
GV at all times displays the coordinates of the cursor, in points, where (0, 0) is the lower left corner. So just note the x-coordinates of the left edge and the right edge of the text, and subtract them: that's your
textwidth in points.
PDF-XChange Viewer has an actual measuring tool.