Date: Mon, 20 Sep 2010 06:27:04 -0400 From: Maxim Khitrov <max@mxcrypt.com> To: Dmitry Krivenok <krivenok.dmitry@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: buildworld + ccache trouble Message-ID: <AANLkTim2uB4BVFu=J234vZX-WvFdfoQUbtu0BAP%2BxCqZ@mail.gmail.com> In-Reply-To: <AANLkTi=wKc_6ppV83Yb68hRE_E8KO4a5YCzp50N6L64b@mail.gmail.com> References: <AANLkTimF79ZPE3MJeHQ=O1ismQCj916Q9kL23SBZOTL9@mail.gmail.com> <4C912926.6070409@FreeBSD.org> <AANLkTi=wKc_6ppV83Yb68hRE_E8KO4a5YCzp50N6L64b@mail.gmail.com>
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On Mon, Sep 20, 2010 at 4:43 AM, Dmitry Krivenok <krivenok.dmitry@gmail.com> wrote: > Your patch works fine for me, thanks! > However, I don't see any performance gain when using ccache: > > Number of cache hits is very low. > I need to understand this... Make sure you have the following environment variables set: CCACHE_HASH_COMPILER=1 (2.4) CCACHE_COMPILERCHECK=content (3.0+) CCache will not use cached files if the compiler has changed. The default way of detecting this change is by comparing compiler's size and modification time. Since the modification time changes after each installworld, you are effectively clearing the cache for all subsequent compilations. Setting the above variables will cause the "sameness" of the compiler to be determined by hashing its contents, which should only change if the compiler code was actually modified. - Maxhome | help
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