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June 3rd 2008, shortly before 1 pm, the job with JOBID 100,000 was completed.

100000ztanDONEimwswallowtailcompute-1-23ising-spring-2008-swt/simpleRuns/data018/t0.900000/mu-2.630000Jun 3 12:48

Cluster Usage

Below are some graphs covering the time period 7/27/07,17:15 to 05/22/08,15:00 sampled every 5 min intervals.

  • Pending Jobs

Pending Jobs

  • Running Jobs

Running Jobs

The maximum running jobs is 288 (total cores/job slots). The peaks beyond that threshold represents our experimentation with overloading the job slots.


Francis report … mathematically, a Fourier transform is:

F(w) = Integral ( f(t) exp(i*w*t) dt)

That is, you integrate a function (or data) with a complex exponential, which is just a sum of sine and cosine functions.

Practically speaking, suppose f(t) was something like position as a function of time. Fourier transforming will reveal if there are characteristic frequencies of the data. For example, if the f(t) was the position of the pendulum in a clock over time, the Fourier transform would show a huge spike at the frequency of the motion, 1 Hz.

So Tom is wondering if there are some characteristic frequencies hiding in this usage pattern … here is the result:



This is the MEAN number of jobs running/pending over each day. Averaging over the day eliminates some of the extreme peaks, and gives a good idea of daily usage, … here is the result:


Other Stats

These graphs reflect data that is polled daily. Each day, the stats are calculated that reflect the activity during the last 7 days, for all users, and refer only to jobs whose status is DONE. The last 7 days of data is thus a shifting “weekly” measure; ie not weekly data.

Below is the graph for the total number of jobs processed. Below it is a measure called throughput; it reflects the jobs/hour processed. The final graph is the total cpu consumed in seconds.

:total jobs


:total cpu


cluster/65.txt · Last modified: 2008/06/03 13:27 (external edit)