I'm writing an application runner on Windows which can limit processor user time and virtual memory for the application it will run. Idea is to have following:
runner.exe mem_limit_in_MB time_limit_in_sec command.exe command_arguments ...
My investigation lead me to Windows Job Objects API and since I'm trying to do all that from C#, I found JobObjectWrapper to help me.
The main part of the code if following:
using (JobObject jo = new JobObject())
{
// Time
jo.Limits.PerProcessUserTimeLimit = TimeSpan.FromMilliseconds(limitTime);
jo.Events.OnEndOfProcessTime += new jobEventHandler<EndOfProcessTimeEventArgs>(Events_OnEndOfProcessTime);
// Memory
jo.Limits.ProcessMemoryLimit = new IntPtr(limitMemory);
jo.Events.OnProcessMemoryLimit += new jobEventHandler<ProcessMemoryLimitEventArgs>(Events_OnProcessMemoryLimit);
// Process
ProcessStartInfo psi = new ProcessStartInfo(command, arguments);
psi.UseShellExecute = false;
psi.RedirectStandardOutput = true;
jo.Limits.IsChildProcessBreakAway = false;
Process p = jo.CreateProcessSecured(psi);
p.WaitForExit();
}
Now, the problem is that it seams that Events_OnEndOfProcessTime is not called timely. If I set 0.5 sec limit for an app that takes several minutes, depending on the run application is once terminated after 0.5 sec and sometimes after 4 sec. Why is this happening? I cannot find any reference if Job Objects are checking limits periodically or in real-time.
My question is two-fold: - Does anyone know about already developed code that does what I need? - Does anyone know if Job Objects are executed periodically or in real time?
Thanks in advance...
PerProcessUserTimeLimit specifies the amount of user-mode time is granted to the process.
"The system periodically checks to determine whether each process associated with the job has accumulated more user-mode time than the set limit. If it has, the process is terminated." (MSDN)
Consequently it depends on your application, particulary on how effient it is burning user-mode time. Ending a process with PerProcessUserTimeLimit = 0.5 after 0.5 sec. means that it has used ~100% cpu (user-mode) during that time.
... if Job Objects are executed periodically or in real time? Periodically, as stated above.
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