<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> But is it normal that ccache on 3.6 branch only uses 3Gb ? I find it very low, compared to all binary files produced. </blockquote></div> ccache of course, over time, fills up the cache space it is allowed to use (up to approximately 10% below it, it seems). That's the whole point of it. An under-utilized cache is a wasted cache. ccache doesn't use magic, it can't know if some cached object file has been "obsoleted" forever, so it keeps them as long as there is space. On my Linux box, where I build for Android maybe once a day, with debugging, and quite occasionally for Linux: cache directory /home/tml/.ccache cache hit (direct) 368163 cache hit (preprocessed) 94352 cache miss 1121108 called for link 93840 multiple source files 93 compile failed 47552 preprocessor error 7596 couldn't find the compiler 92 bad compiler arguments 5288 unsupported source language 433 autoconf compile/link 64967 unsupported compiler option 165727 no input file 398434 files in cache 51223 cache size 18.0 Gbytes max files 500000 max cache size 20.0 Gbytes I have no idea what the age distribution of the cached object files are. Perhaps ccache -s should tell that too, in some suitable fashion..., like 50% of files are older than N days, 10% older than M days. On the other hand, on a tinderbox, with dozens of builds per day (for three cross-compilation targets), without debugging, with cache accumulated for maybe two weeks, it still hasn't filled up the maximum space of 20 GB I gave it: cache directory /home/android/.ccache cache hit (direct) 9725802 cache hit (preprocessed) 94058 cache miss 229024 called for link 492953 multiple source files 1570 compile failed 980552 ccache internal error 2 preprocessor error 33103 bad compiler arguments 59830 unsupported source language 7953 autoconf compile/link 531055 unsupported compiler option 1568175 no input file 467468 files in cache 197527 cache size 14.8 Gbytes max cache size 20.0 Gbytes Actually, the "unsupported compiler option" is a bit high there, isn't it? Hmm. --tml