On Mon, Oct 20, 2008 at 4:18 PM, Barry Smith <bsmith at mcs.anl.gov> wrote: > > Sorry I haven't responded to this fully. > > I hate the idea of a hack that is just for this case and a special > flag you got to set or pass in. > > For the _1_, _2_ etc I did the following. If the string in the code has > _%d_ (for example _1_) it first checks for an exact match in the list of > set options. If it does not find an exact match it removes the _%d_ and > tries > again for an exact match. This seems to work pretty well and could be > used in many places in the code, not just in the PCMG stuff.
I am not sure I like this. It does not fit with my idea of namespaces, but I do like something very similar (maybe even identical, I can't tell yet). What if we let an object have multiple prefixes, and we have an order for checking. The way we could have -pc_mg_1_ksp_max_its 2 -pc_mg_1_up_ksp_max_its 3 The second would override the first for the up smoother. Is this identical to what you were proposing? Matt > It would be nice to use some similar technique the case below. > Possibilities > 1) use _CAPS_ first exactly and then removing the _CAPS_ > 2) make the part with special charactors _<string>_, first look with > _string_ > then try without _string_ (the <> are just my example charactors, could use > | or whatever. > > What do people think about this? > > Barry > > Note that currently we always use small letters in the option names. We > could continue to > have the options database have small letters and use _tolower(CAPS)_ as the > first test. > I'm inclinded to do 1). > > With multiple _XXX_ _4_ in an option we'll have to be careful to properly > check all possibilities > in some consistent order. > > > On Oct 8, 2008, at 10:14 PM, Dave May wrote: > >> Howdy, >> Should there be a mechanism to independently configure the down >> and up smoothers >> for PCMG from the command line? >> >> From the looks of things, it seems that on a given level, one is only >> able to set the smoothing >> sweeps to be different via >> -pc_mg_smoothup 3 -pc_mg_smoothdown 2 >> >> Since both the down and up smoothers (KSP's) have the prefix set to be >> "mg_levels_X", >> it would seem that I cannot differentiate between the up ksp at level >> X from the down ksp >> at level X via any command line arguments. >> >> It would be pain to ALWAYS have to configure both the up and down >> smoothers independently. >> But to enable the down and up smoothers to be configured independently >> (on those odd occasions >> you want to do it) , could we do something like; set a flag via >> -pc_mg_smoothers_different >> which would include in the smoothers prefix, the words "up" or "down"? >> Then on the command line we could do something like >> -mg_levels_1_up_ksp_type XXX >> -mg_levels_1_down_ksp_type YYY >> >> Cheers, >> Dave >> > > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener