Add copy_contender benchmark, Makefile, and copy_testbench header

Benchmark supports:
=> Generating a chain of copies in a single context
    - No timing pause between copies
=> Copies to, from, or between device(s)
=> Variable size and number of copies
=> Logging how many milliseconds each copy takes

*** Warning ***
* Relies on implicit synchronization of unidirectional copies across
* streams. Verify that this is still the case with CUDA before
* trusting results. One can check by verifying that the runtime for
* one iteration roughly matches the time for each iteration in a
* multi-iteration run.
***

1 files changed, 4 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e81353d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,4 @@
+.PHONY: copy_experiments
+
+copy_experiments:
+        $(MAKE) -C $@