[Pw_forum] Do you think QE could benefit from the Hyper-ThreadingTech of XEON 5500 series?

[Huiqun Zhou]

Hyper-threading usually lowers the performance by 5-15% in HPC environment, 
you'd better turn it off. HT benefits applications in enterprise environment where 
the CPU usage is about 15-25% so that a physical CPU core can handle two 
threads effectively in a time-sharing way. 


Huiqun Zhou
@Earth Sciences, Nanjing University, China
  ----- Original Message ----- 
  From: vega lew 
  To: PWSCF Forum 
  Sent: Friday, November 27, 2009 1:23 AM
  Subject: [Pw_forum] Do you think QE could benefit from the Hyper-ThreadingTech of XEON 5500 series?


  Dear all,

  I got 5 computers with two XEON 5520 and 24G memory. I find the Hyper-Threading is switched on by default. I wonder if QE could benefit from Hyper-Threading Tech. of Xeon CPUs?
  Should I switch it off and trigger one process for each core to promote the QE performance?
  Or remain the Hyper-Threading on and trigger two processes for each core?

  best

  vega

  -- 
  ==================================================================================
  Vega Lew ( weijia liu)
  Graduate student
  State Key Laboratory of Materials-oriented Chemical Engineering
  College of Chemistry and Chemical Engineering
  Nanjing University of Technology, 210009, Nanjing, Jiangsu, China
  ******************************************************************************************************************
  Email: vegalew at gmail.com
  Office: Room A705, Technical Innovation Building, Xinmofan Road 5#, Nanjing, Jiangsu, China  
  ****************************************************************************************************************** 



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