diff --git a/src/lib/test/microbenchmark.hpp b/src/lib/test/microbenchmark.hpp
index 28b904fec..d733f93d7 100644
--- a/src/lib/test/microbenchmark.hpp
+++ b/src/lib/test/microbenchmark.hpp
@@ -88,7 +88,7 @@ namespace test{
     auto start = system_clock::now();
     invokeTestLoop();
     Dur duration = system_clock::now () - start;
-    return duration.count()/(repeatCnt);
+    return duration.count() / repeatCnt;
   };
   
   
diff --git a/src/vault/gear/scheduler.hpp b/src/vault/gear/scheduler.hpp
index 10acbf42e..a861578fa 100644
--- a/src/vault/gear/scheduler.hpp
+++ b/src/vault/gear/scheduler.hpp
@@ -123,6 +123,12 @@ namespace gear {
         { }
       
       
+      bool
+      empty()  const
+        {
+          return layer1_.empty();
+        }
+      
       /**
        * 
        */
diff --git a/tests/vault/gear/scheduler-service-test.cpp b/tests/vault/gear/scheduler-service-test.cpp
index 43e3a484b..b2b89ca41 100644
--- a/tests/vault/gear/scheduler-service-test.cpp
+++ b/tests/vault/gear/scheduler-service-test.cpp
@@ -30,6 +30,7 @@
 #include "vault/gear/scheduler.hpp"
 #include "lib/time/timevalue.hpp"
 #include "lib/format-cout.hpp"
+#include "lib/test/microbenchmark.hpp"
 #include "lib/test/diagnostic-output.hpp"///////////////TODO
 //#include "lib/util.hpp"
 
@@ -99,22 +100,51 @@ namespace test {
           
           // this test class is declared friend to get a backdoor to Scheduler internals...
           auto& schedCtx = Scheduler::ExecutionCtx::from(scheduler);
-          Time now = schedCtx.getSchedTime();
-          schedCtx.post (now, &probe, schedCtx);
           
-          CHECK (activity::WAIT == scheduler.getWork());
           
-          cout << detector.showLog()<<endl; // HINT: use this for investigation...
-          CHECK (detector.verifyInvocation("testProbe"));
-          ////////////////////////////////////////////////////////////////////////////////////TODO need a way to get the actual time passed to the Probe
-SHOW_EXPR(now)
-SHOW_EXPR(detector.invokeTime(probe))
 
           auto wasClose = [](TimeValue a, TimeValue b)
-                            {
-                              return Duration{Offset{a,b}} < Duration{FSecs{1,2000}}; // 500µs are considered "close"
-                            };
-          CHECK (wasClose (now, detector.invokeTime (probe)));
+                              {                                // 500µs are considered "close"
+                                return Duration{Offset{a,b}} < Duration{FSecs{1,2000}};
+                              };
+          auto wasInvoked = [&](Time start)
+                              {
+                                Time invoked = detector.invokeTime (probe);
+                                return invoked >= start
+                                   and wasClose (invoked, start);
+                              };
+          
+          TimeVar start = RealClock::now();
+          schedCtx.post (start, &probe, schedCtx);
+SHOW_EXPR(_raw(start))
+SHOW_EXPR(_raw(detector.invokeTime(probe)))
+          
+          CHECK (wasInvoked(start));
+          CHECK (scheduler.empty());
+          
+          activity::Proc res;
+          double delay_us;
+          int64_t slip_us;
+          
+          
+          auto pullWork = [&] {
+                                uint REPETITIONS = 1;
+                                delay_us = lib::test::benchmarkTime([&]{ res = scheduler.getWork(); }, REPETITIONS);
+                                slip_us = _raw(detector.invokeTime(probe)) - _raw(start);
+                              };
+
+//          start = RealClock::now();
+          pullWork();
+          
+SHOW_EXPR(_raw(start))
+SHOW_EXPR(_raw(detector.invokeTime(probe)))
+SHOW_EXPR(res);
+SHOW_EXPR(delay_us)
+SHOW_EXPR(slip_us)
+SHOW_EXPR(wasInvoked(start))
+          CHECK (activity::WAIT == res);
+          
+          cout << detector.showLog()<<endl; // HINT: use this for investigation...
         }
       
       
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index dabec0da9..05f9647bf 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -88196,6 +88196,12 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node CREATED="1698246275186" ID="ID_389803917" MODIFIED="1698246286348" TEXT="bei jedem Aufruf im Objekt speichern"/>
 <node CREATED="1698246286912" ID="ID_1611070007" MODIFIED="1698246292046" TEXT="Zugriffs-Funktion schaffen"/>
 </node>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1698273941216" ID="ID_206667469" MODIFIED="1698273954614" TEXT="Kurznotation entwickeln zum Formulieren der Testf&#xe4;lle">
+<icon BUILTIN="pencil"/>
+<node CREATED="1698273959952" ID="ID_1633573295" MODIFIED="1698273977867" TEXT="lokale Abk&#xfc;rzungs-&#x3bb;"/>
+<node CREATED="1698273979493" ID="ID_1574422283" MODIFIED="1698273987600" TEXT="Zeitmessung fest einbauen"/>
+<node CREATED="1698273988136" ID="ID_1921986548" MODIFIED="1698274003262" TEXT="Werte in immer gleiche Variable &#x201e;abwerfen&#x201c;"/>
+</node>
 </node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1697473158929" ID="ID_1723058065" MODIFIED="1697484548083" TEXT="vollst&#xe4;ndiger Ende-zu-Ende Test incl. WorkForce">
@@ -88208,6 +88214,19 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <icon BUILTIN="pencil"/>
 </node>
 </node>
+<node BACKGROUND_COLOR="#fafe99" COLOR="#fa002a" CREATED="1698275299501" ID="ID_1052614531" MODIFIED="1698275445662" TEXT="DAS DING ZUCKT">
+<arrowlink COLOR="#e9fea5" DESTINATION="ID_353022740" ENDARROW="Default" ENDINCLINATION="-90;-5;" ID="Arrow_ID_187000480" STARTARROW="None" STARTINCLINATION="51;7;"/>
+<font NAME="SansSerif" SIZE="16"/>
+<icon BUILTIN="launch"/>
+<node COLOR="#435e98" CREATED="1698275461079" HGAP="31" ID="ID_1605227309" MODIFIED="1698275499061" TEXT="erste Timings sehen doch ganz ordentlich aus..." VSHIFT="-2">
+<edge COLOR="#a8fe8d"/>
+<icon BUILTIN="clock"/>
+<node CREATED="1698275564705" ID="ID_181492806" MODIFIED="1698275568734" TEXT="-O3">
+<node CREATED="1698275570360" ID="ID_1639263149" MODIFIED="1698275580859" TEXT="leere work-Function: 2&#xb5;s"/>
+<node CREATED="1698275583014" ID="ID_1884559465" MODIFIED="1698275618806" TEXT="post() einstellen &#x27f6; Dispatch: 5&#xb5;s"/>
+</node>
+</node>
+</node>
 <node CREATED="1697758391611" ID="ID_124711923" MODIFIED="1697758397083" TEXT="F&#xe4;lle">
 <node CREATED="1697758425500" ID="ID_1450418166" MODIFIED="1697758430911" TEXT="simpleUsage">
 <node CREATED="1697758440737" ID="ID_1211803424" MODIFIED="1697758454084" TEXT="zeigt hier vor allem was man braucht"/>
@@ -88220,6 +88239,10 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#338800" CREATED="1698247394051" ID="ID_198829622" MODIFIED="1698247420009" TEXT="kann einfachen Aufruf einer vorher eingespielten Activity belegen">
 <icon BUILTIN="button_ok"/>
 </node>
+<node COLOR="#338800" CREATED="1698275364348" ID="ID_353022740" MODIFIED="1698275448819" TEXT="kann direkt weitergeleitete Invocation zeigen">
+<linktarget COLOR="#e9fea5" DESTINATION="ID_353022740" ENDARROW="Default" ENDINCLINATION="-90;-5;" ID="Arrow_ID_187000480" SOURCE="ID_1052614531" STARTARROW="None" STARTINCLINATION="51;7;"/>
+<icon BUILTIN="button_ok"/>
+</node>
 </node>
 </node>
 </node>