Roland Mainz wrote: > Bob Friesenhahn wrote: > >> Dolt illustrates that libtool performance should improve. However, the >> performance numbers posted by Dolt's author are based on an outdated >> version of libtool 1.5.X and libtool 2.2.X (containing four more years >> of development) is considerably faster. >> >> I have already suggested on the libtool mailing list that DTrace can >> be used to help evaluate where libtool is losing time. This is an >> area where OpenSolaris developers can help the open source community >> at large and illustrate that OpenSolaris is able to offer something >> that Linux does not. >> > > Per alanc's request I already did some investigation in this area since > the FOX tree has some compile time trouble with libtool... > ... part of the problem is that "libtool" acts like half a |fork()|-bomb > and triggers many many child processes (as seen with the Dtrace > fork-o-meter.d script). > I did a small test and replaced #!/usr/bin/bash with #!/usr/bin/ksh93 > and did some other changes - the resulting build time spend with > libtool processes (e.g. "bash") droped to ~~46% of the original > execution time (measured over five builds each (OkOk... that's not a > perfect benchmark... ;-/ (nor do I claim to be an expert in > benchmarking... ;-/))) ... and I'm confident that more performance can > be pressed out of te script by using more of the ksh93 builtin commands > (e.g. "basename" etc.) and replace some calls to "sed" by builtin string > operators... and finally the ksh93-integration update1 will deliver > "shcomp" (the ksh93 shell script compiler) which will help to squish > even more performance out of such a script... >
One other optimization that I was considering was to use pre-generated config.cache files. For eg. in the drivers subdirectory the config.cache generated for the first driver built is copied to a common location and then that is passed as a parameter while calling configure for the rest of the drivers. This avoids a whole plethora of redundant checks the results of which are already in the cache. Regards, Moinak. > ---- > > Bye, > Roland > >
