Re: Using ccache for build{world, kernel}

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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_at_~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
>> # _at__at_ -331,8 +331,10 _at__at_
>> #          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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