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Update README with PowerPC specifics notes

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Adhemerval Zanella 2014-02-02 19:19:04 -02:00
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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