Process creation is slower on 2 vCPUs than on a single vCPU by UnixBench test

Solution Verified - Updated -

Issue

  • 1 vCPU shows higher index score than 2 vCPUs for process spawning
  • 1 vCPU test
[root@localhost UnixBench]# ./Run spawn -c 1                                                                                                                   
...
   BYTE UNIX Benchmarks (Version 5.1.3)

   System: localhost: GNU/Linux
   OS: GNU/Linux -- 2.6.32-358.el6.x86_64 -- #1 SMP Tue Jan 29 11:47:41 EST 2013
   Machine: x86_64 (x86_64)
   Language: en_US.utf8 (charmap="UTF-8", collate="UTF-8")
   CPU 0: Intel(R) Xeon(R) CPU E5-2630 v2 @ 2.60GHz (5187.5 bogomips)
          x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET
   19:39:46 up 8 days,  5:23,  3 users,  load average: 0.00, 0.00, 0.00; runlevel 3

------------------------------------------------------------------------
Benchmark Run: Fri Jul 03 2015 19:39:46 - 19:41:26
1 CPU in system; running 1 parallel copy of tests

Process Creation                              10511.9 lps   (30.0 s, 2 samples)

System Benchmarks Partial Index              BASELINE       RESULT    INDEX
Process Creation                                126.0      10511.9    834.3
                                                                   ========
System Benchmarks Index Score (Partial Only)                          834.3
  • 2 vCPUs test
[root@localhost UnixBench]# ./Run spawn -c 1
...
   BYTE UNIX Benchmarks (Version 5.1.3)

   System: localhost: GNU/Linux
   OS: GNU/Linux -- 2.6.32-358.el6.x86_64 -- #1 SMP Tue Jan 29 11:47:41 EST 2013
   Machine: x86_64 (x86_64)
   Language: en_US.utf8 (charmap="UTF-8", collate="UTF-8")
   CPU 0: Intel(R) Xeon(R) CPU E5-2630 v2 @ 2.60GHz (5187.5 bogomips)
          x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET
   CPU 1: Intel(R) Xeon(R) CPU E5-2630 v2 @ 2.60GHz (5187.5 bogomips)
          x86-64, MMX, Physical Address Ext, SYSENTER/SYSEXIT, SYSCALL/SYSRET
   19:49:08 up 2 min,  3 users,  load average: 0.04, 0.06, 0.02; runlevel 3

------------------------------------------------------------------------
Benchmark Run: Fri Jul 03 2015 19:49:08 - 19:50:47
2 CPUs in system; running 1 parallel copy of tests

Process Creation                               4043.0 lps   (30.0 s, 2 samples)

System Benchmarks Partial Index              BASELINE       RESULT    INDEX
Process Creation                                126.0       4043.0    320.9
                                                                   ========
System Benchmarks Index Score (Partial Only)                          320.9

Environment

  • Red Hat Enterprise Linux
  • VMware guest with 1 vCPU or 2 vCPUs

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