Hi,
I am experiencing severe timing problems when using SmartInspect logging to a file and via tcp at the same time:
There is a background thread that reads data from the serial port writes them to a global variable that is protected with a mutex. After setting the variable, I have added some timing code that is supposed to tell me wether there are any timing issues. The thread receives a message 30 times a second.
The code looks like this:
var
UpdateDiff: Int64;
ThisUpdate: Int64;
begin
FCritSect.Enter;
try
QueryPerformanceCounter(ThisUpdate);
UpdateDiff := ThisUpdate - FLastUpdated;
FLastUpdated := ThisUpdate;
// write the received data to the global variable
finally
FCritSect.Leave;
end;
// any logging is done after the protected code:
// exiting here prevents the problem
FLogSession.EnterMethod('SetData');
FLogSession.LogValue(lvDebug, 'LastUpdated', FLastUpdated);
FLogSession.LogValue(lvDebug, 'UpdateDiff', UpdateDiff);
FLogSession.WatchInt64('UpdateDiff', UpdateDiff);
FLogSession.LeaveMethod('SetData');
end;Now, what happens is that every 5 seconds the thread seems to freeze for quite a while (more than half a second). At the same time the SmartInspect console updates its display. If I put an exit at the position marked above, the issue goes away.
There are other threads that run in parallel and write to a different SiSession. I haven’t done any timing on them yet.
Am I doing anything wrong here? Or is SmartInspect just not suited for this kind of application?
twm