Glynn Clements wrote on 09/10/2007 08:25 PM: > Hamish wrote: > > >> Glynn Clements wrote: >> >>> Markus Neteler wrote: >>> >>>> when using g.mlist in mapsets with thousands of maps in >>>> it (as happens with MODIS time series), it gets extremely >>>> slow. >>>> >> .. >> Glynn Clements wrote: >> >>> The main thing which stands out is that it invokes "grep" once for >>> every name returned by g.list: >>> >> see attached patch for consideration. Following Glynn's suggestion it >> gets rid of the loop for each map name, making the script ~50% faster >> than before, but still about twice as slow as a single call to g.list. >> > > Here's my proposed alternative. It avoids the use of backticks in > favour of a pipeline ending in a while loop. > > It appears that Hamish's implementation based on Glynn's former notes is much faster:
time sh g.mlist_glynn type=rast map=neteler pat="map*" real 0m1.200s user 0m0.749s sys 0m0.464s time sh g.mlist_hamish type=rast map=neteler pat="map*" real 0m0.338s user 0m0.190s sys 0m0.052s Is that the contribution to portability? :) Markus ------------------ ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler ITC -> since 1 March 2007 Fondazione Bruno Kessler ------------------ _______________________________________________ grass-dev mailing list [email protected] http://grass.itc.it/mailman/listinfo/grass-dev
