Using ccache for build{world, kernel}
michael johnson
buhnux at gmail.com
Tue Nov 15 16:45:34 PST 2005
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On Nov 15, 2005, at 7:06 PM, Maxim Sobolev wrote:
> I have better patch which extends detection mechanism, so that
> along with size/mtime checksum of the compiler binary is stored as
> well. Since compiler binary linked from the same sources/objects
> will have the same checksum it allows ccache to be used OOB with
> buildworld. Do you have any interest in putting it into the port?
>
> http://www.portaone.com/~sobomax/ccache.buildworld
>
Sure, I just have one question about the way this thing works. Would
using this patch not
make collision probability of the cache higher? I don't think this
would be a huge problem,
but it's not impossible to do with a 1,000,000~ file cache now.
> -Maxim
>
> Jens Schweikhardt wrote:
>
>> Folks,
>> # Put this in /usr/ports/devel/ccache/files/patch-nohash-size-
>> mtime and
>> # reinstall the port. Then export CCACHE_NOHASH_SIZE_MTIME=y
>> during your
>> # makes for buildworld and buildkernel. This melts my buildworld time
>> # from 2700s (real@~100%CPU) to under 1000s and buildkernel from 800s
>> # to 250s, so you gain about a factor 3 for ab-initio builds. Sweet!
>> # # # --- ccache.c.orig Mon Oct 31 17:38:21 2005
>> # +++ ccache.c Mon Oct 31 17:52:31 2005
>> # @@ -331,8 +331,10 @@
>> # hash_string(str_basename(args->argv[0]));
>> # }
>> # # - hash_int(st.st_size);
>> # - hash_int(st.st_mtime);
>> # + if (!getenv("CCACHE_NOHASH_SIZE_MTIME")) {
>> # + hash_int(st.st_size);
>> # + hash_int(st.st_mtime);
>> # + }
>> [Rest of patch snipped ...]
>> I just asked the devel/ccache maintainer to commit this patch and he
>> promptly did (Thanks Michael Johnson, aka ahze!). So you only need
>> this
>> unless your ports tree is current as of now.
>> Regards,
>> Jens
>>
>
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