[gentoo-user] no compiler cache

[gentoo-user] no compiler cache

[Justin R Findlay]

Recently I upgraded gcc to gcc-4.1.1 from gcc-4.0.3 and cleared out the
ccache cache believing that cached compiler data across different
compiler versions would be useless.  However after doing an 'emerge -e
world', there's nothing in the cache.  I'm inclined to blame a specific
unsupported CFLAG, but the ccache statistics don't indicate anything
like that.  What would cause ccache to not cache any compiler data?

# ccache -s
cache directory                     /var/tmp/ccache
cache hit                              0
cache miss                           163
called for link                    12870
multiple source files                 69
compile failed                         1
preprocessor error                  1222
bad compiler arguments                 2
not a C/C++ file                    3763
autoconf compile/link              17491
unsupported compiler option         5237
no input file                      12830
files in cache                       326
cache size                           2.2 Mbytes
max cache size                       2.5 Gbytes

# emerge --info | grep amd64
Portage 2.1.1_pre1-r1 (default-linux/amd64/2006.0/no-multilib,
gcc-4.1.1/vanilla, glibc-2.4-r3, 2.6.17 x86_64)
ACCEPT_KEYWORDS="amd64 ~amd64"

# emerge --info | grep CFLAGS
CFLAGS="-march=athlon64 -m64 -O3 -fmessage-length=0 -pipe"


Justin
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Re: [gentoo-user] no compiler cache

[Jeremy Olexa]

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Justin R Findlay wrote:
> world', there's nothing in the cache.  I'm inclined to blame a specific
<snip>
> files in cache                       326

Looks like there is files in the cache to me. =)

- --
Jeremy Olexa
(olexa@cs.umn.edu)
Office: EE/CS 1-201
CS/IT Systems Staff
University of Minnesota

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Re: [gentoo-user] no compiler cache

[Justin R Findlay]

On Sun, Jun 25, 2006 at 12:26:03AM -0500, Jeremy Olexa wrote:
> Looks like there is files in the cache to me. =)

Yeah, but I would expect more than 2.2 Mib of data in the cache after an
'emerge -e world' and at least some cache hits.


Justin
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Re: [gentoo-user] no compiler cache

[Jeremy Olexa]

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Justin R Findlay wrote:
> On Sun, Jun 25, 2006 at 12:26:03AM -0500, Jeremy Olexa wrote:
>> Looks like there is files in the cache to me. =)
> 
> Yeah, but I would expect more than 2.2 Mib of data in the cache after an
> 'emerge -e world' and at least some cache hits.
> 
> 
> Justin

In my experience, I would expect cache hits the second, third, .. nth
time you emerged a package. Not the first. Give it some time and see if
the cache a) populate and b) gets hits.

- --
Jeremy Olexa
(olexa@cs.umn.edu)
Office: EE/CS 1-201
CS/IT Systems Staff
University of Minnesota

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Re: [gentoo-user] no compiler cache

[James Buckley]

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I agree it seems a bit small, but as long as ur getting "misses" your cache
is working. The next time you do emerge -e world (and as long as you haven't
changed your compiler) you should get lots of "hits".

The cache is good for when you do emerge -e system, then world. As many
packages will just be the same.


On 25/06/06, Jeremy Olexa <olexa@cs.umn.edu> wrote:
>
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> Hash: SHA1
>
> Justin R Findlay wrote:
> > On Sun, Jun 25, 2006 at 12:26:03AM -0500, Jeremy Olexa wrote:
> >> Looks like there is files in the cache to me. =)
> >
> > Yeah, but I would expect more than 2.2 Mib of data in the cache after an
> > 'emerge -e world' and at least some cache hits.
> >
> >
> > Justin
>
> In my experience, I would expect cache hits the second, third, .. nth
> time you emerged a package. Not the first. Give it some time and see if
> the cache a) populate and b) gets hits.
>
> - --
> Jeremy Olexa
> (olexa@cs.umn.edu)
> Office: EE/CS 1-201
> CS/IT Systems Staff
> University of Minnesota
>
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> I8VtcpHJUWvj2x14e2kg+uo=
> =CbN+
> -----END PGP SIGNATURE-----
> --
> gentoo-user@gentoo.org mailing list
>
>

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