Add measure_startup_oh benchmark

Supports ECRTS'25 partitioning paper.

To nicely parse the resultant output, one could use the following
shell pipeline:

./measure_startup_oh 2>&1 | cut -d "=" -s -f 2 | cut -d " " -f 2 \
                          | tr "\n" " " | sed 's/$/r - p/' | dc

2 files changed, 47 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 1956d72..61e7bef 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,9 @@ preemption_logger: task_host_utilities.cu preemption_logger.cu testbench.h
 measure_launch_oh: measure_launch_oh.cu testbench.h
         $(NVCC) measure_launch_oh.cu -o measure_launch_oh
 
+measure_startup_oh: measure_startup_oh.c testbench.h
+        $(NVCC) measure_startup_oh.c -o measure_startup_oh
+
 copy_experiments:
         $(MAKE) -C $@
 
diff --git a/measure_startup_oh.c b/measure_startup_oh.c
new file mode 100644
index 0000000..56f9ea7
--- /dev/null
+++ b/measure_startup_oh.c
@@ -0,0 +1,44 @@
+/* Copyright 2025 Joshua Bakita
+ * Simple kernel that uses measure_launch_oh to measure how long CUDA
+ * initialization takes.
+ * Prints status to stderr and nothing to stdout.
+ */
+#include <time.h>   // clock_gettime()
+#include <stdio.h>  // fprintf(), perror()
+#include <stdlib.h> // putenv()
+#include <string.h> // strcmp()
+#include <unistd.h> // execve()
+extern char **environ;
+
+#include "testbench.h"
+
+#define measure_launch_oh "./measure_launch_oh"
+
+int main(int argc, char **argv) {
+        int *__unused, i;
+        struct timespec start;
+
+        if (argc == 2 && (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h"))) {
+                fprintf(stderr, "Usage: %s [environment var to apply to child (optional)]\n", argv[0]);
+                return 1;
+        }
+
+        static char* child_argv[3];
+        child_argv[0] = measure_launch_oh;
+        child_argv[1] = "1";
+        child_argv[2] = NULL;
+
+        // Use this to apply LD_PRELOAD to the child only
+        if (argv[1])
+                putenv(argv[1]);
+
+        clock_gettime(CLOCK_MONOTONIC_RAW, &start);
+        fprintf(stderr, "(%d) Starting '"measure_launch_oh"' at CLOCK_MONOTONIC_RAW = %ld ns\n",
+                        getpid(), time2ns(start));
+        if (execve(measure_launch_oh, child_argv, environ)) {
+                perror("Unable to start '"measure_launch_oh"'");
+                return 1;
+        }
+
+        return 0;
+}