~14% improvement.
@@ -11,7 +11,7 @@ opt.release = -O2 -flto
sanitize = $(sanitize.$(mode))
opt = $(opt.$(mode))
libs = -laio
libs = -laio -ltcmalloc
CXXFLAGS = -std=gnu++1y -g -Wall -Werror $(opt) -MD -MT $@ -MP $(sanitize) -fvisibility=hidden $(libs)
CXXFLAGS += -pthread
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