# HG changeset patch
# User kevinw
# Date 1583758493 0
# Node ID f3ceb2e8bd217eba4967fd6ee6c17443257b1dc0
# Parent  fb74ae5912096e3a63ff144d7ec497dfb04eae7a
8240295: hs_err elapsed time in seconds is not accurate enough
Reviewed-by: dholmes, sspitsyn

diff -r fb74ae591209 -r f3ceb2e8bd21 src/share/vm/runtime/os.cpp
--- a/src/share/vm/runtime/os.cpp	Mon Jun 29 21:30:26 2020 +0100
+++ b/src/share/vm/runtime/os.cpp	Mon Mar 09 12:54:53 2020 +0000
@@ -868,10 +868,9 @@
   }
 
   double t = os::elapsedTime();
-  // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in
-  //       Linux. Must be a bug in glibc ? Workaround is to round "t" to int
-  //       before printf. We lost some precision, but who cares?
+  // NOTE: a crash using printf("%f",...) on Linux was historically noted here.
   int eltime = (int)t;  // elapsed time in seconds
+  int eltimeFraction = (int) ((t - eltime) * 1000000);
 
   // print elapsed time in a human-readable format:
   int eldays = eltime / secs_per_day;
@@ -881,7 +880,7 @@
   int elmins = (eltime - day_secs - hour_secs) / secs_per_min;
   int minute_secs = elmins * secs_per_min;
   int elsecs = (eltime - day_secs - hour_secs - minute_secs);
-  st->print_cr("elapsed time: %d seconds (%dd %dh %dm %ds)", eltime, eldays, elhours, elmins, elsecs);
+  st->print_cr(" elapsed time: %d.%06d seconds (%dd %dh %dm %ds)", eltime, eltimeFraction, eldays, elhours, elmins, elsecs);
 }
 
 // moved from debug.cpp (used to be find()) but still called from there