Use a parallel build for libunwind

We currently over-build it quite a bit; I'll try to look into that
issue, but for now we can lessen the effects by at least building
it in parallel.

CMakeLists.txt

@@ -173,6 +173,7 @@ ExternalProject_Add(libunwind
                     DEPENDS libunwind_patched
                     UPDATE_COMMAND autoreconf -i
                     CONFIGURE_COMMAND ${CMAKE_SOURCE_DIR}/build_deps/libunwind/configure ${LIBUNWIND_DEBUG_CFLAGS} --prefix=${CMAKE_BINARY_DIR}/build_deps/libunwind --enable-shared=0 --disable-block-signals ${LIBUNWIND_CONSERVATIVE_CHECKS} ${LIBUNWIND_DEBUG} ${LIBUNWIND_DEBUG_FRAME}
+                    BUILD_COMMAND make -j${TEST_THREADS}
                     LOG_UPDATE ON
                     LOG_CONFIGURE ON
                     LOG_BUILD ON

Makefile

@@ -862,6 +862,9 @@ nosearch_dbgpy_% nosearch_pydbg_%: %.py ext_pythondbg
 $(call make_search,dbgpy_%)
 $(call make_search,pydbg_%)
 
+pydbg: ext_pythondbg
+	export PYTHON_VERSION=$$(python2.7-dbg -V 2>&1 | awk '{print $$2}'); PYTHONPATH=test/test_extension/build/lib.linux-x86_64-2.7-pydebug $(GDB) --ex "dir $(DEPS_DIR)/python-src/python2.7-$$PYTHON_VERSION/debian" $(GDB_CMDS) --args python2.7-dbg
+
 # "kill valgrind":
 kv:
 	ps aux | awk '/[v]algrind/ {print $$2}' | xargs kill -9; true

microbenchmarks/.gitignore

+b.py
+b2.py
+b3.py