On Tue, 27 Dec 2011, Damien Fleuriot wrote:
On 12/27/11 3:51 PM, Warren Block wrote:
On Tue, 27 Dec 2011, Rajneesh Kumar wrote:
During my development, I want to check if my modules compile successfully
or not. I am only changing the ARP portion and whenever I compile my
kernel, it takes around 20mins and compiles all different modules also.
I just want to compile and check whether my ARP modules, which I have
changed, compile fine or not. How to do it?
Others have mentioned ways to reduce what is rebuilt. devel/ccache can
be used in combination with those. Even by itself it ought to seriously
reduce kernel compile time.
Would ccache also help with world/ports compile times ?
Yes, if some of it is already in the cache. Ports change relatively
rarely, so I don't use ccache for them.
Are there any drawbacks to using it ? (the underlying question being: is
it worthy of a production environment ?)
It needs cache space and probably slows things down a bit when code is
not already in the cache. Some source updates invalidate a lot of the
cache. But no other problems I've noticed.
Times for 8-STABLE on an E8400 CPU, everything in the cache.
make -j4 buildworld:
Normal 19:41
ccache 6:02
make -j4 buildkernel (custom kernel):
Normal 8:43
ccache 2:47
Those are best-case times. A typical ccache buildworld after csup to
-stable is about 9 minutes on this system.
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