Add a warmup option to get somewhat more consistent timings.

diff --git a/flow.cpp b/flow.cpp
index 2ed5bb855792aad0d97dbbc61fc2134c59ba27a5..4fa779473a400a3baa5e9c6c1cfd0a26f9c174cc 100644 (file)
--- a/flow.cpp
+++ b/flow.cpp
@@ -48,6 +48,8 @@ float vr_alpha = 1.0f, vr_delta = 0.25f, vr_gamma = 0.25f;
 
 bool enable_timing = true;
 bool detailed_timing = false;
+bool enable_warmup = false;
+bool in_warmup = false;
 bool enable_variational_refinement = true;  // Just for debugging.
 bool enable_interpolation = false;
 
@@ -1179,7 +1181,9 @@ GLuint DISComputeFlow::exec(GLuint tex0, GLuint tex1, ResizeStrategy resize_stra
        }
        total_timer.end();
 
-       timers.print();
+       if (!in_warmup) {
+               timers.print();
+       }
 
        // Scale up the flow to the final size (if needed).
        if (finest_level == 0 || resize_strategy == DO_NOT_RESIZE_FLOW) {
@@ -1562,7 +1566,9 @@ GLuint Interpolate::exec(GLuint tex0, GLuint tex1, GLuint forward_flow_tex, GLui
        }
        pool.release_texture(flow_tex);
        total_timer.end();
-       timers.print();
+       if (!in_warmup) {
+               timers.print();
+       }
 
        return output_tex;
 }
@@ -1767,6 +1773,16 @@ void compute_flow_only(int argc, char **argv, int optind)
        glGenerateTextureMipmap(tex1_gray);
 
        DISComputeFlow compute_flow(width1, height1);
+
+       if (enable_warmup) {
+               in_warmup = true;
+               for (int i = 0; i < 10; ++i) {
+                       GLuint final_tex = compute_flow.exec(tex0_gray, tex1_gray, DISComputeFlow::RESIZE_FLOW_TO_FULL_SIZE);
+                       compute_flow.release_texture(final_tex);
+               }
+               in_warmup = false;
+       }
+
        GLuint final_tex = compute_flow.exec(tex0_gray, tex1_gray, DISComputeFlow::RESIZE_FLOW_TO_FULL_SIZE);
 
        schedule_read<FlowType>(final_tex, width1, height1, filename0, filename1, flow_filename, "flow.ppm");
@@ -1861,6 +1877,19 @@ void interpolate_image(int argc, char **argv, int optind)
        gray.exec(tex1, tex1_gray, width1, height1);
        glGenerateTextureMipmap(tex1_gray);
 
+       if (enable_warmup) {
+               in_warmup = true;
+               for (int i = 0; i < 10; ++i) {
+                       GLuint forward_flow_tex = compute_flow.exec(tex0_gray, tex1_gray, DISComputeFlow::DO_NOT_RESIZE_FLOW);
+                       GLuint backward_flow_tex = compute_flow.exec(tex1_gray, tex0_gray, DISComputeFlow::DO_NOT_RESIZE_FLOW);
+                       GLuint interpolated_tex = interpolate.exec(tex0, tex1, forward_flow_tex, backward_flow_tex, width1, height1, 0.5f);
+                       compute_flow.release_texture(forward_flow_tex);
+                       compute_flow.release_texture(backward_flow_tex);
+                       interpolate.release_texture(interpolated_tex);
+               }
+               in_warmup = false;
+       }
+
        GLuint forward_flow_tex = compute_flow.exec(tex0_gray, tex1_gray, DISComputeFlow::DO_NOT_RESIZE_FLOW);
        GLuint backward_flow_tex = compute_flow.exec(tex1_gray, tex0_gray, DISComputeFlow::DO_NOT_RESIZE_FLOW);
 
@@ -1889,7 +1918,8 @@ int main(int argc, char **argv)
                { "disable-timing", no_argument, 0, 1000 },
                { "detailed-timing", no_argument, 0, 1003 },
                { "ignore-variational-refinement", no_argument, 0, 1001 },  // Still calculates it, just doesn't apply it.
-               { "interpolate", no_argument, 0, 1002 }
+               { "interpolate", no_argument, 0, 1002 },
+               { "warmup", no_argument, 0, 1004 }
        };
 
        for ( ;; ) {
@@ -1921,6 +1951,9 @@ int main(int argc, char **argv)
                case 1003:
                        detailed_timing = true;
                        break;
+               case 1004:
+                       enable_warmup = true;
+                       break;
                default:
                        fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
                        exit(1);