make tasks to test at nproc / 2, which minimizes cpu thrashing

closes #17

Signed-off-by: Erik Hollensbe <git@hollensbe.org>

Makefile

@@ -4,7 +4,12 @@ postgres: stop-postgres
 stop-postgres:
 	docker rm -f acmed-postgres || :
 
-run-with-backtrace:
-	RUST_BACKTRACE=1 rustup run nightly cargo run
+CARGO_TEST=cargo test -- --test-threads $$(($$(nproc) / 2))
+
+test:
+	${CARGO_TEST}
+
+debug-test:
+	DEBUG=1 cargo test -- --nocapture --test-threads $$(($$(nproc) / 2))
 
 .PHONY: postgres stop-postgres

README.md

@@ -53,10 +53,24 @@ psql -U postgres -h localhost coyote
 
 `docker` is required to run the tests. The tests take around 70 seconds to run on a 5900X and use all 24 threads most of the test runtime. Be mindful of the time they take, especially when running them on a slower system.
 
+If you like full throttle:
+
 ```
 cargo test
 ```
 
+Add `DEBUG=1` for verbose test logging.
+
+If you'd like tests that don't punish your processor, you can run:
+
+```
+make test
+# or
+make debug-test
+```
+
+To accomplish the same using roughly only half of the CPU time.
+
 ## Task List
 
 ### JOSE/ACME Protocols: