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| -rw-r--r-- | README | 20 |
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@@ -1,3 +1,23 @@ +POWERPC NOTES +------------- + +This branch contains PowerPC specific performance tunings and +platform fixes. All test, including heap and cpu profiler, works +on powerpc32, powerpc64, and powerpc64le. + +On newer distros with 64k page size, it is highly recommended +to configure with '-DTCMALLOC_LARGE_PAGES64K' CXX flag. It turns the +internal page allocation to use 64K page size and avoid more syscalls +to allocate memory from OS. + +The default value of objects transfered between central list and +thread cache is increased from 32 to 32768. This is a performance +improvement, specially on programs that allocate lot of objects of +the same size (like a std::map<int> with a large set of elements). +The value can be change by setting the environment variable +TCMALLOC_TRANSFER_NUM_OBJ. + + IMPORTANT NOTE FOR 64-BIT USERS ------------------------------- There are known issues with some perftools functionality on x86_64 |