> On Jul 29, 2015, at 9:46 AM, Hans Petter Selasky <h...@selasky.org> wrote: > > On 07/29/15 16:24, Warner Losh wrote: >> >>> On Jul 29, 2015, at 4:19 AM, Hans Petter Selasky <h...@selasky.org> wrote: >>> >>> On 07/03/15 22:15, Warner Losh wrote: >>>> >>>>> On Jul 3, 2015, at 11:35 AM, Roger Pau Monné <roy...@freebsd.org> wrote: >>>>> >>>>> El 03/07/15 a les 19.26, Adrian Chadd ha escrit: >>>>>> ok, so why's it make NFS builds so slow? >>>>> >>>>> AFAICT it makes the build process spawn a bunch of concurrent "find" >>>>> processes that weren't previously there. >>>> >>>> OK. I’ll fix it. I knew it might slow things down a little, but this is >>>> quite a bit more than “a little”. >>>> >>>> Warner >>>> >>> >>> Hi, >>> >>> Is there a fix for this issue yet? At Mellanox we're also seeing that NFS >>> mounted shares are extremely slow building even a single module. Maybe the >>> output from the find can be cached in a file somehow? >> >> Committed the fix within a day of this message (so three weeks ago): >> >> https://svnweb.freebsd.org/base?view=revision&revision=285124 >> >> Is it not working? this is the first negative report I’ve heard since Adrian >> and Roger posted. I spiked the test-build with a find that recorded every >> time it ran. W/o the fix, it runs a lot. With the fix it ran once. Is this >> not the case still? > > Hi, > > In this particular case one "find of /sys" takes 11-16 seconds over NFS, so > building a single KMOD takes 16 seconds too. It's not possible to eliminate > the find entirely during repeated builds?
16 seconds? That’s a really slow NFS server and at least 11 seconds longer than
it should take :(.
Make doesn’t really have the ability to cache results run-to-run, but I’ll poke
at other options. In the mean time, you can do something like:
setenv _MPATH `(cd $MAKEOBJDIRPREFIX/path/sys/GENERIC; make -V _MPATH)`
to cache the value. Not ideal, but likely good enough for repeated module
builds. If I can’t come up with anything clever, I’ll just commit the current
list… I hate doing that, but I also hadn’t counted upon find taking so stinkin’
long...
Warner
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