topic Re: Need A SAS Program to Run for Specific Lenght of Time in Administration and Deployment

Need A SAS Program to Run for Specific Length of Time

dgower — Thu, 19 Nov 2015 21:47:40 GMT

I'm trying to test RTM and I need to be able to submit a job that will run for say 5 or 10 minutes so I can see how RTM is functioning while a job is running. Does anyone know of some generic SAS code/program that can be adjusted to run for a specific number of minutes? The option to stress the CPU and memory of the servers would be a huge plus.

Thanks,

Dan

Re: Need A SAS Program to Run for Specific Lenght of Time

RW9 — Fri, 13 Nov 2015 15:30:44 GMT

Well, there is the sleep() function:

https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a001418809.htm

Alternatively you could set a series of datasteps upd with do loops for specified number of loops. However most of base SAS is based on CPU/memory, so changing that will change the run time. But timing is provided, so you can see that datastep x takes y seconds in this run, and z in that run and see the difference between.

Re: Need A SAS Program to Run for Specific Lenght of Time

dgower — Fri, 13 Nov 2015 17:47:33 GMT

Thanks!

Re: Need A SAS Program to Run for Specific Length of Time

bdoug — Thu, 19 Nov 2015 21:48:56 GMT

Submit this code. It will run for a while and rev up the CPU! Adjust the loop iteration counts to adjust the run time.

data _null_;
   do i=1 to 1000000000;
      do j=1 to 1000000000;
          k=i*j;
          l=mod(k,2499900001);
      end;
   end;
run;

Re: Need A SAS Program to Run for Specific Lenght of Time

dgower — Tue, 17 Nov 2015 13:02:22 GMT

Excellent! Thank you. This is exactly what I needed.

Re: Need A SAS Program to Run for Specific Length of Time

kannand — Sat, 21 Nov 2015 12:43:53 GMT

While the looping code might accomplish the execution time, it might be worthwhile to note that @RW9's sleep() function might be more code efficient and CPU efficient.

Re: Need A SAS Program to Run for Specific Length of Time

jakarman — Sat, 21 Nov 2015 16:20:11 GMT

You can use
a/ sleep without any load on the system
b/ a cpu loop causing just cpu load
c/ a hash object or buffers with sort causing load on memory change the sizing for load on IO
d/ have a load to an external rdbms so network traffic can get loaded heavily
Tuning load balancing is also on the resource geeting the overload.

Re: Need A SAS Program to Run for Specific Lenght of Time

dgower — Mon, 23 Nov 2015 14:11:13 GMT

Despite reducing the numbers by several digits, this loop ran for 6+ hours and the CPU never spiked.

Re: Need A SAS Program to Run for Specific Length of Time

jakarman — Mon, 23 Nov 2015 15:29:14 GMT

Of course you will not see a spike in cpu. It is a single threaded process limited to one cpu processor.
You will have to run this at the same time by the number of expected users. It can spread every task on may of those processors. Using a multithreaded proc will show an other load

Re: Need A SAS Program to Run for Specific Length of Time

ISedgwick — Sun, 06 Nov 2016 10:50:00 GMT

Data _null_;

Endtime=time()+10*60 /* 10 MIN - change for needed duration */ ;

Do while(time() le Endtime);

/* BESPOKE CODE TO CREATE STRESS */

End;

Run;

There will be some cpu overhead in this job due to calling the time function several times.