Re: [ccache] Cache misses are extremely expensive.
Yes, I did see the part about the -include. I didn’t specify it because Xcode does the right thing by default. There was also no preprocessor error in the stats. Attached a log but I don’t see anything wrong with it. Also updated to 3.2.7 but didn’t change something so far. I’ll keep looking too. Thanks! Guillaume [2016-07-21T10:31:37.793499 82587] === CCACHE 3.2.5 STARTED = [2016-07-21T10:31:37.793499 82587] Config: (default) base_dir = [2016-07-21T10:31:37.793499 82587] Config: (default) cache_dir = /Users/gcamp/.ccache [2016-07-21T10:31:37.793499 82587] Config: (default) cache_dir_levels = 2 [2016-07-21T10:31:37.793499 82587] Config: (default) compiler = [2016-07-21T10:31:37.793499 82587] Config: (default) compiler_check = mtime [2016-07-21T10:31:37.793499 82587] Config: (default) compression = false [2016-07-21T10:31:37.793499 82587] Config: (default) compression_level = 6 [2016-07-21T10:31:37.793499 82587] Config: (default) cpp_extension = [2016-07-21T10:31:37.793499 82587] Config: (default) direct_mode = true [2016-07-21T10:31:37.793499 82587] Config: (default) disable = false [2016-07-21T10:31:37.793499 82587] Config: (default) extra_files_to_hash = [2016-07-21T10:31:37.793499 82587] Config: (environment) hard_link = true [2016-07-21T10:31:37.793499 82587] Config: (default) hash_dir = false [2016-07-21T10:31:37.793499 82587] Config: (environment) log_file = /Users/gcamp/ccache.log [2016-07-21T10:31:37.793499 82587] Config: (default) max_files = 0 [2016-07-21T10:31:37.793499 82587] Config: (environment) max_size = 3.0G [2016-07-21T10:31:37.793499 82587] Config: (default) path = [2016-07-21T10:31:37.793499 82587] Config: (default) prefix_command = [2016-07-21T10:31:37.793499 82587] Config: (default) read_only = false [2016-07-21T10:31:37.793499 82587] Config: (default) read_only_direct = false [2016-07-21T10:31:37.793499 82587] Config: (default) recache = false [2016-07-21T10:31:37.793499 82587] Config: (default) run_second_cpp = false [2016-07-21T10:31:37.793499 82587] Config: (environment) sloppiness = file_macro, include_file_mtime, include_file_ctime, time_macros, pch_defines, file_stat_matches [2016-07-21T10:31:37.793499 82587] Config: (default) stats = true [2016-07-21T10:31:37.793499 82587] Config: (default) temporary_dir = [2016-07-21T10:31:37.793499 82587] Config: (default) umask = [2016-07-21T10:31:37.793499 82587] Config: (default) unify = false [2016-07-21T10:31:37.794203 82587] Command line: ccache /usr/bin/clang -x c++ -arch x86_64 -fmessage-length=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -std=gnu++1y -stdlib=libc++ -Wno-trigraphs -fpascal-strings -O0 -fno-common -Wno-missing-field-initializers -Wno-missing-prototypes -Wunreachable-code -Werror=deprecated-objc-isa-usage -Werror=objc-root-class -Wno-non-virtual-dtor -Wno-overloaded-virtual -Wno-exit-time-destructors -Wno-missing-braces -Wparentheses -Wswitch -Wunused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wempty-body -Wconditional-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wconstant-conversion -Wint-conversion -Wbool-conversion -Wenum-conversion -Wno-shorten-64-to-32 -Wno-newline-eof -Wno-c++11-extensions -DDEBUG=1 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.3.sdk -fasm-blocks -fstrict-aliasing -Wdeprecated-declarations -Winvalid-offsetof -mios-simulator-version-min=8.0 -g -fvisibility-inlines-hidden -Wno-sign-conversion -I/Users/gcamp/Dev/DerivedData/Transit-ecarlyzsybvyawbnymtoooesgrce/Build/Intermediates/bgtfsLib.build/Debug-iphonesimulator/bgtfsLib.build/bgtfsLib.hmap -I/usr/local/include -I/Users/gcamp/Dev/Transit-iOS/Submodules/transitLib/bgtfs/bgtfsLib/TransitUtils -I/Users/gcamp/Dev/DerivedData/Transit-ecarlyzsybvyawbnymtoooesgrce/Build/Products/Debug-iphonesimulator/include -I/Users/gcamp/Dev/DerivedData/Transit-ecarlyzsybvyawbnymtoooesgrce/Build/Intermediates/bgtfsLib.build/Debug-iphonesimulator/bgtfsLib.build/DerivedSources/x86_64 -I/Users/gcamp/Dev/DerivedData/Transit-ecarlyzsybvyawbnymtoooesgrce/Build/Intermediates/bgtfsLib.build/Debug-iphonesimulator/bgtfsLib.build/DerivedSources -F/Users/gcamp/Dev/DerivedData/Transit-ecarlyzsybvyawbnymtoooesgrce/Build/Products/Debug-iphonesimulator -include /Users/gcamp/Dev/DerivedData/Transit-ecarlyzsybvyawbnymtoooesgrce/Build/Intermediates/PrecompiledHeaders/bgtfsLib-cyxnnvfzlwevhvfipapwjvyfxobr/bgtfsLib.pch -MMD -MT dependencies -MF /Users/gcamp/Dev/DerivedData/Transit-ecarlyzsybvyawbnymtoooesgrce/Build/Intermediates/bgtfsLib.build/Debug-iphonesimulator/bgtfsLib.build/Objects-normal/x86_64/RoutesRepresentation.d --serialize-diagnostics /Users/gcamp/Dev/DerivedData/Transit-ecarlyzsybvyawbnymtoooesgrce/Build/Intermediates/bgtfsLib.build/Debug-iphonesimulator/bgtfsLib.build/Objects-normal/x86_64/RoutesRepresentation.di
Re: [ccache] Cache misses are extremely expensive.
On 23 June 2016 at 21:14, Guillaume Campagna 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 ___ ccache mailing list ccache@lists.samba.org https://lists.samba.org/mailman/listinfo/ccache
[ccache] Cache misses are extremely expensive.
Hi, Just started using ccache based on this tutorial and so far I like it. However, caches miss being extremely slow. Here are my results : Regular clean build without ccache : 1m40s First build with ccache : 4m36s Second build with ccache : 30s I’m not sure where to start debugging. The performance page (https://ccache.samba.org/performance.html) mentions how complexity of the make file can slow down compilation, but in this context I use Xcode so call of ccache should be relatively quick. I was expecting some performance decrease, but not this much! There are my current settings using version 3.2.5 : export CCACHE_MAXSIZE=3G export CCACHE_HARDLINK=true export CCACHE_SLOPPINESS=pch_defines,file_macro,time_macros,include_file_mtime,include_file_ctime,file_stat_matches Note that I do use a pch, if that changes something. Thanks for any pointers! ___ ccache mailing list ccache@lists.samba.org https://lists.samba.org/mailman/listinfo/ccache
