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autofdo create_gcov uses a lot of memory for large sample files. Since gcc runs quite long the sample files generated during the bootstrap are fairly ig. Currently I can't even build make autoprofiledbootstrap on my system at home because create_gcov needs more than 12GB and runs out of memory. This should probably be fixed in create_gcov, but for now lowering the sampling rate works well enough for me. The bootstrap run is long enough that it gets good enough data in any case. gcc/: 2019-01-14 Andi Kleen <ak@linux.intel.com> * Makefile.in: Lower autofdo sampling rate by 10x. * Makefile.tpl: Dito. From-SVN: r267930
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