1 files changed, 7 insertions, 4 deletions

diff --git a/preemption_logger.cu b/preemption_logger.cu
index 89b348a..ec3c22e 100644
--- a/preemption_logger.cu
+++ b/preemption_logger.cu
@@ -90,10 +90,11 @@ int main(int argc, char **argv) {
         // Synchronize the GPU and CPU clocks (if requested) using the utilities
         // from task_host_utilities.cu.
         if (!skip_conversion) {
-                // Note that this appears to almost always be 1.0 on recent GPUs
-                d2h_scale = GetGPUTimerScale(0);
+                // The skew is between -13 and 60 microseconds per second on the GTX
+                // 1080, GTX 1060 3 GiB, GTX 970, RTX 6000 Ada, and GTX 1080 Ti.
+                d2h_scale = InternalGetGPUTimerScale(0);
                 InternalReadGPUNanoseconds(0, &host_s, &dev_ns);
-                if (host_s == 0 && !dev_ns) {
+                if (d2h_scale == -1 || (host_s == 0 && !dev_ns)) {
                         fprintf(stderr, "Unable to synchronize time with the GPU. Aborting...\n");
                         return 1;
                 }
@@ -153,7 +154,9 @@ int main(int argc, char **argv) {
                 fprintf(stderr, "(%d) Aprox launch overhead: %ld ns\n", pid, launch_oh);
                 fprintf(stderr, "(%d) CPU clock - GPU clock: %ld tick gap\n", pid,
                     (long)s2ns(host_s) - dev_ns);
-                fprintf(stderr, "(%d) 1 CPU tick/1 GPU tick: %.3f\n", pid, d2h_scale);
+                fprintf(stderr, "(%d) After 1 second, the GPU clock is %.f us %s (%.9fx d2h)\n",
+                    pid, fabs((d2h_scale - 1) * 1e6),
+                    d2h_scale > 1 ? "behind" : "ahead", d2h_scale);
         }
 
         return 0;