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wireprotoframing: buffer emitted data to reduce frame count...
wireprotoframing: buffer emitted data to reduce frame count An upcoming commit introduces a wire protocol command that can emit hundreds of thousands of small objects. Without a buffering layer, we would emit a single, small frame for every object. Performance profiling revealed this to be a source of significant overhead for both client and server. This commit introduces a very crude buffering layer so that we emit fewer, bigger frames in such a scenario. This code will likely get rewritten in the future to be part of the streams API, as we'll need a similar strategy for compressing data. I don't want to think about it too much at the moment though. server before: user 32.500+0.000 sys 1.160+0.000 after: user 20.230+0.010 sys 0.180+0.000 client before: user 133.400+0.000 sys 93.120+0.000 after: user 68.370+0.000 sys 32.950+0.000 This appears to indicate we have significant overhead in the frame processing code on both client and server. It might be worth profiling that at some point... Differential Revision: https://phab.mercurial-scm.org/D4473
Augie Fackler - - Load All Authors

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Makefile
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CC = clang
CXX = clang++
all: bdiff mpatch xdiff
fuzzutil.o: fuzzutil.cc fuzzutil.h
$(CXX) $(CXXFLAGS) -g -O1 -fsanitize=fuzzer-no-link,address \
-std=c++17 \
-I../../mercurial -c -o fuzzutil.o fuzzutil.cc
fuzzutil-oss-fuzz.o: fuzzutil.cc fuzzutil.h
$(CXX) $(CXXFLAGS) -std=c++17 \
-I../../mercurial -c -o fuzzutil-oss-fuzz.o fuzzutil.cc
bdiff.o: ../../mercurial/bdiff.c
$(CC) $(CFLAGS) -fsanitize=fuzzer-no-link,address -c -o bdiff.o \
../../mercurial/bdiff.c
bdiff: bdiff.cc bdiff.o fuzzutil.o
$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
-std=c++17 \
-I../../mercurial bdiff.cc bdiff.o fuzzutil.o -o bdiff
bdiff-oss-fuzz.o: ../../mercurial/bdiff.c
$(CC) $(CFLAGS) -c -o bdiff-oss-fuzz.o ../../mercurial/bdiff.c
bdiff_fuzzer: bdiff.cc bdiff-oss-fuzz.o fuzzutil-oss-fuzz.o
$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial bdiff.cc \
bdiff-oss-fuzz.o fuzzutil-oss-fuzz.o -lFuzzingEngine -o \
$$OUT/bdiff_fuzzer
mpatch.o: ../../mercurial/mpatch.c
$(CC) -g -O1 -fsanitize=fuzzer-no-link,address -c -o mpatch.o \
../../mercurial/mpatch.c
mpatch: CXXFLAGS += -std=c++17
mpatch: mpatch.cc mpatch.o fuzzutil.o
$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
-I../../mercurial mpatch.cc mpatch.o fuzzutil.o -o mpatch
mpatch-oss-fuzz.o: ../../mercurial/mpatch.c
$(CC) $(CFLAGS) -c -o mpatch-oss-fuzz.o ../../mercurial/mpatch.c
mpatch_fuzzer: mpatch.cc mpatch-oss-fuzz.o fuzzutil-oss-fuzz.o
$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial mpatch.cc \
mpatch-oss-fuzz.o fuzzutil-oss-fuzz.o -lFuzzingEngine -o \
$$OUT/mpatch_fuzzer
mpatch_corpus.zip:
python mpatch_corpus.py $$OUT/mpatch_fuzzer_seed_corpus.zip
x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h
$(CC) -g -O1 -fsanitize=fuzzer-no-link,address -c \
-o $@ \
$<
xdiff: CXXFLAGS += -std=c++17
xdiff: xdiff.cc xdiffi.o xprepare.o xutils.o fuzzutil.o
$(CXX) $(CXXFLAGS) -DHG_FUZZER_INCLUDE_MAIN=1 -g -O1 -fsanitize=fuzzer-no-link,address \
-I../../mercurial xdiff.cc \
xdiffi.o xprepare.o xutils.o fuzzutil.o -o xdiff
fuzz-x%.o: ../../mercurial/thirdparty/xdiff/x%.c ../../mercurial/thirdparty/xdiff/*.h
$(CC) $(CFLAGS) -c \
-o $@ \
$<
xdiff_fuzzer: xdiff.cc fuzz-xdiffi.o fuzz-xprepare.o fuzz-xutils.o fuzzutil-oss-fuzz.o
$(CXX) $(CXXFLAGS) -std=c++17 -I../../mercurial xdiff.cc \
fuzz-xdiffi.o fuzz-xprepare.o fuzz-xutils.o fuzzutil-oss-fuzz.o \
-lFuzzingEngine -o $$OUT/xdiff_fuzzer
clean:
$(RM) *.o *_fuzzer \
bdiff \
mpatch \
xdiff
oss-fuzz: bdiff_fuzzer mpatch_fuzzer mpatch_corpus.zip xdiff_fuzzer
.PHONY: all clean oss-fuzz