> >Someone wrote recently: >> >>I use tlemop for DOS, its a little slow if you have a slow hard drive cuz >>of how it organizes its data but it does the job and has some good sorting > Stephen Thompson <SThompson@esiusa.com> explained: >Slow performance of TLEMOP may be due to a misunderstanding of the way it >was expected to be used. .... >For most purposes the 'right way' to use TLEMOP is with the "save the >workfile' switch set. .... >Once it is in place, updating the 'database' AKA 'the workfile' from >new TLE collections, saved Email messages etc is quite efficient. > > I have not tried QSORT, so I would be interested in hearing the results > of a level ground race involving a few thousand elements. > I tried an earlier version, to maintain a 4000+ elset. I grasped the idea of the workfile, and believe I used it correctly. I found it too slow, and the elset file of 630 kb turned into a workfile of 4+ MB, which seemed to keep growing. I have not tested the newer version, because I want to keep all old elsets for future analysis of orbits and UnId's, and haven't seen any tle manager doing that. Still, I would gladly benchmark tlemop against qsort, which I use to sort my database, then a program of my own to read it sequentially to discard duplicates and save older elsets. On my 486-50DX PC notebook with a 350 MB drive, running Windows 3.11 (with 10 active Win programs, 2 DOS windows running SkyMap, plus qsort and Program Manager) I sorted a 4347 record, 660 kb database, from descending ndot2 to ascending USSPACECOM catalog number, in 25 seconds. Sorting the resulting ascending USSPACECOM file into descending USSPACECOM took 26 seconds - no significant difference. ------------------------------------------------------------ -- b_gimle@algonet.se +46-8-7428086 (home) -- -- 59.22371 N, 18.22857 E AND member of : -- -- http://www.algonet.se/~b_gimle seesat-l / seesat-d -- -- bjorn@tt-tech.se +46-8-59095789 (office)-- ------------------------------------------------------------ Join us at Eurosom 2, the Satellite Observers Meeting: Oct.19/20 ! Ghent, Belgium http://www.rzg.mpg.de/~bdp/eurosom.html ---