Re: Cache misses are extremely expensive.
Joel Rosdahl <[email protected]> Tue, 12 Jul 2016 21:23:05 +0200
| Newsgroups | gmane.comp.compilers.ccache |
|---|---|
| Message-ID | <CAK8D=piKBAYHyVgzzXdU_-4QzzZD+O5VUui9VHMLh9dVwaORAQ@mail.gmail.com> |
On 23 June 2016 at 21:14, Guillaume Campagna <[email protected]> wrote: > Just started using ccache based on this tutorial and so far I like it. > However, caches miss being extremely slow. [..] Note that I do use a pch, > if that changes something. [...] Since you included pch_defines and time_macros in CCACHE_SLOPPINESS, I guess you've seen the instructions on https://ccache.samba.org/manual.html#_precompiled_headers already? If so, did you also follow the instructions about using -include or -fpch-preprocess? To get more information on what's happening, you can set CCACHE_LOGFILE to a file path and then look in that file for clues. -- Joel