Kernel_Task pinning CPU

Question

So I have been trying to find a scalable solution to this issue for some time now.  Loads of complaints about it with various reported fixes with ACPI extension loading, switching in and out of energy saving settings...but none of these work for me.
I am running a 3.5 GHz 6 core Xeon E5 with 16 GB Ram Mac Pro.  We bought this to use as our dedicated build server.  Its running Xcode, some Java based tools we used to generate the c code from XML and thats about it.
If I use Xcode more than a few times the kernel_task spikes and turns this Ferrari into a Scooter with two fat people riding on it.  Anyone else have the same issue or know of a real solution to this problem?  This machine is brand new, no hardware failures, re-installed the OS 4 times... there is no reason for this crappy kernel_task behaviour.

Answer 1

EtreCheck version: 2.1.8 (121)
Report generated February 24, 2015 at 10:16:51 AM EST
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    Mac Pro (Late 2013) (Technical Specifications)
    Mac Pro - model: MacPro6,1
    1 3.5 GHz 6-Core Intel Xeon E5 CPU: 6-core
    16 GB RAM Upgradeable
        DIMM1
            4 GB DDR3 ECC 1867 MHz ok
        DIMM2
            4 GB DDR3 ECC 1867 MHz ok
        DIMM3
            4 GB DDR3 ECC 1867 MHz ok
        DIMM4
            4 GB DDR3 ECC 1867 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en2: 802.11 a/b/g/n/ac
Video Information: ℹ️
    AMD FirePro D500 - VRAM: 3072 MB
        E19T6W 1440 x 900 @ 60 Hz
    AMD FirePro D500 - VRAM: 3072 MB
System Software: ℹ️
    OS X 10.9.5 (13F34) - Time since boot: 0:2:29
Disk Information: ℹ️
    APPLE SSD SM0256F disk0 : (251 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        251GBSSD (disk0s2) / : 250.14 GB (155.19 GB free)
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
    HGST HUS724030ALE640 disk1 : (3 TB)
        EFI (disk1s1) <not mounted> : 210 MB
        GDrive (disk1s2) /Volumes/GDrive : 3.00 TB (2.88 TB free)
USB Information: ℹ️
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple, Inc. Keyboard Hub
        Genius 2.4G Wireless Mouse
        Apple Inc. Apple Keyboard
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus_2
    Apple Inc. thunderbolt_bus_1
        G-Technology G-DRIVE with Thunderbolt USB 3.0
    Apple Inc. thunderbolt_bus_0
Configuration files: ℹ️
    /etc/hosts - Count: 1
Gatekeeper: ℹ️
    Mac App Store and identified developers
Launch Agents: ℹ️
    [unknown]    com.oracle.java.Java-Updater.plist [Click for support]
Launch Daemons: ℹ️
    [unknown]    com.oracle.java.Helper-Tool.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.google.keystone.agent.plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    Application  (/Applications/Dropbox.app)
Internet Plug-ins: ℹ️
    Default Browser: Version: 537 - SDK 10.9
    QuickTime Plugin: Version: 7.7.3
    JavaAppletPlugin: Version: 15.0.0 - SDK 10.7 Check version
3rd Party Preference Panes: ℹ️
    None
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
         3%    com.apple.WebKit.WebContent
         3%    Xcode
         2%    WindowServer
         2%    Dropbox
         1%    com.apple.WebKit.Networking
Top Processes by Memory: ℹ️
    876 MB    Xcode
    223 MB    com.apple.WebKit.WebContent
    86 MB    com.apple.IconServicesAgent
    69 MB    ocspd
    69 MB    Dropbox
Virtual Memory Information: ℹ️
    8.47 GB    Free RAM
    4.03 GB    Active RAM
    3.28 GB    Inactive RAM
    1.38 GB    Wired RAM
    2.66 GB    Page-ins
    0 B    Page-outs
Diagnostics Information: ℹ️
    Feb 24, 2015, 10:13:31 AM    Self test - passed
    Feb 24, 2015, 09:45:28 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/smcFanControl_2015-02-24-09452 8_[redacted].crash