Messages in this thread | | | Date | Wed, 8 Dec 2004 18:25:59 +1100 | Subject | Re: make -j4 gets stuck w/ ccache over NFS | From | tridge@samba ... |
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Mark,
> I'm using ccache version 2.4 [1]. I just changed ~/.ccache to a symbolic > link to a directory which is NFS mounted [2]. The kernel source itself is > on a local FS. With the ccache suitably primed, when I do a kernel compile > using 'make -j4' it seems to get stuck for seconds at a time. When it gets > unstuck, it blows through a handful of files and then gets stuck again.
I'd suggest you first narrow down the problem to either being a locking problem or a file IO problem. To do that, change lock_fd() in util.c in ccache to just "return 0;". That will mean the ccache stats file could become corrupted, but if it runs fast then you know that it is a locking problem. I have noticed severe speed problem with NFS locking on Linux previosly, which is why I mention this as a possibility.
Note that removing this locking will not cause ccache to produce incorrect object files, it will just mean the stats printed with "ccache -s" may be inaccurate.
Cheers, Tridge
PS: I also wonder why you're not just using distcc. It's usually a lot more appropriate in a distributed environment.
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