Fix a bug making that the simulation ran longer than expected

If you asked for 3 seconds, and then had a task terminating after 2
seconds, the function simulated for 5 seconds.

Now, the time already spent in the loop in previous rounds is properly
taken into account.

Thanks to Guillaume Serrière for detecting the issue.

diff --git a/src/simdag/sd_global.c b/src/simdag/sd_global.c
index 00512b1..1ca32d0 100644 (file)
--- a/src/simdag/sd_global.c
+++ b/src/simdag/sd_global.c
@@ -258,7 +258,7 @@ xbt_swag_t SD_simulate_swag(double how_long) {
 
     XBT_DEBUG("Total time: %f", total_time);
 
-    elapsed_time = surf_solve(how_long > 0 ? surf_get_clock() + how_long : -1.0);
+    elapsed_time = surf_solve(how_long > 0 ? surf_get_clock() + how_long - total_time: -1.0);
     XBT_DEBUG("surf_solve() returns %f", elapsed_time);
     if (elapsed_time > 0.0)
       total_time += elapsed_time;