Log entry time 00:03:02 on April 06, 2008

Entry number 230220

Followups:

• 230552 04/07/08 13:51 Ole Hansen adaql5 is 1 core only

Here are the number of cpu's on each of the adaq analysis machines:

  adaql3:  2 cores
  adaql4:  1 core
  adaql5:  2 cores
  adaql6:  1 core
  adaql7:  1 core

Yes I know 'top' shows twice as many.  That is due to Intel's
"Hyperthreading"
feature being enabled.  Hyperthreading is a questionable feature created by
Intel whereby the CPU and motherboard can be made to lie to the OS about how
many cores reside in a given chip.

It doesn't actually improve things in real life except in a few corner cases.
Cache misses and other scheduling details usually mean running 2 jobs on a
pretend-dual core CPU takes _longer_ than running those two jobs
sequentially.
And, more to the point, slows the machine to crawl making it a pain for
others
to work on.

So, please run at most 1 analysis job per physical core.  Life will be
better.

You may now return to analyzing code.