Xcode 4.4 cpu utilization 100%

Since upgrading to XCode 4.4, I am seeing it use > 100% CPU. I've taken a sample, most threads appear to be spending almost all their time in mach_msg_trap (partial sample below). Known issue? Other than editing some rather simple C++ code, xcode is downloading and installing libraries, not an activity that I'd expect to spin my fans up to top speed.
Is this a known issue? Is there a workaround?
Sampling process 39159 for 3 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Analysis of sampling Xcode (pid 39159) every 1 millisecond
Process:         Xcode [39159]
Path:            /Applications/Xcode.app/Contents/MacOS/Xcode
Load Address:    0x101ca9000
Identifier:      com.apple.dt.Xcode
Version:         4.4 (1484)
Build Info:      IDEApplication-1484000000000000~4
Code Type:       X86-64 (Native)
Parent Process: launchd [106]
Date/Time:       2012-07-28 14:42:37.585 +0200
OS Version:      Mac OS X 10.7.4 (11E53)
Report Version: 7
Call graph:
    2121 Thread_804492   DispatchQueue_1: com.apple.main-thread (serial)
    + 2121 ??? (in Xcode) load address 0x101ca9000 + 0x1dc0 [0x101caadc0]
    +   2121 NSApplicationMain (in AppKit) + 867 [0x7fff87516244]
    +     2121 -[NSApplication run] (in AppKit) + 470 [0x7fff8729a071]
    +       2121 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit) + 135 [0x7fff8729d735]
    +         2121 _DPSNextEvent (in AppKit) + 659 [0x7fff8729de31]
    +           2121 BlockUntilNextEventMatchingListInMode (in HIToolbox) + 62 [0x7fff8c12160e]
    +             2121 ReceiveNextEventCommon (in HIToolbox) + 355 [0x7fff8c121781]
    +               2121 RunCurrentEventLoopInMode (in HIToolbox) + 277 [0x7fff8c11a4d3]
    +                 2119 CFRunLoopRunSpecific (in CoreFoundation) + 230 [0x7fff8f6ac486]
    +                 ! 2100 __CFRunLoopRun (in CoreFoundation) + 1204 [0x7fff8f6acc74]
    +                 ! : 2100 __CFRunLoopServiceMachPort (in CoreFoundation) + 188 [0x7fff8f6a450c]
    +                 ! :   2100 mach_msg (in libsystem_kernel.dylib) + 73 [0x7fff8976fd71]
    +                 ! :     2100 mach_msg_trap (in libsystem_kernel.dylib) + 10 [0x7fff8977067a]

I believe the NSLog is a different problem.
NSLog printing of a very large string can cause a beachball with XCode 4.4 eating up a very high percentage of CPU Cycles. (For example see ... http://www.openradar.me/11972490) ... I experience this on my old MacMini running XCode 4.4
I have a new MacBook air and I am seeing the high CPU usage causing my fans to spin up so high that I can hear them on my normally silent machine, but with no beachball. Quitting Xcode and reopening resolves the issue on my MaxBook Air.

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| 0 | SELECT STATEMENT | | 1 | 109 | 451 (3)| 00:00:06 |
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"PRIVILEGE#"=12))
3 - access("O"."OWNER#"="U"."USER#")
4 - access("O"."OBJ#"="A"."OBJ#")
filter(NVL("A"."PROCEDURE$","O"."NAME") LIKE :2 ESCAPE '/' AND
DECODE("A"."PROCEDURE$",NULL,NULL,"O"."NAME") LIKE :3 ESCAPE '/')
5 - filter("A"."ARGUMENT" LIKE :5 ESCAPE '/' OR "A"."ARGUMENT" IS NULL AND
DECODE("A"."TYPE#",0,NULL,1,DECODE("A"."CHARSETFORM",2,'NVARCHAR2','VARCHAR2'),2,DECO
DE("A"."SCALE",(-127),'FLOAT','NUMBER'),3,'NATIVE
INTEGER',8,'LONG',9,DECODE("A"."CHARSETFORM",2,'NCHAR
VARYING','VARCHAR'),11,'ROWID',12,'DATE',23,'RAW',24,'LONG
RAW',29,'BINARY_INTEGER',69,'ROWID',96,DECODE("A"."CHARSETFORM",2,'NCHAR','CHAR'),100
,'BINARY_FLOAT',101,'BINARY_DOUBLE',102,'REF
CURSOR',104,'UROWID',105,'MLSLABEL',106,'MLSLABEL',110,'REF',111,'REF',112,DECODE("A"
."CHARSETFORM",2,'NCLOB','CLOB'),113,'BLOB',114,'BFILE',115,'CFILE',121,'OBJECT',122,
'TABLE',123,'VARRAY',178,'TIME',179,'TIME WITH TIME
ZONE',180,'TIMESTAMP',181,'TIMESTAMP WITH TIME ZONE',231,'TIMESTAMP WITH LOCAL TIME
ZONE',182,'INTERVAL YEAR TO MONTH',183,'INTERVAL DAY TO SECOND',250,'PL/SQL
RECORD',251,'PL/SQL TABLE',252,'PL/SQL BOOLEAN','UNDEFINED') IS NOT NULL)
8 - access("U"."NAME" LIKE :1 ESCAPE '/')
filter("U"."NAME" LIKE :1 ESCAPE '/')
9 - filter(((-"KZSPRPRV")=(-144) OR (-"KZSPRPRV")=(-141)) AND
"INST_ID"=USERENV('INSTANCE'))
11 - access("OBJ#"=:B1 AND "PRIVILEGE#"=12)
filter("PRIVILEGE#"=12)
12 - filter("GRANTEE#"="KZSROROL")
52 rows selected.
Regards,
Savad

How is GC cpu utilization % calculated?

I am trying to find a way to capture the problem where a user process eats up a ton of cpu for over 30 minutes. I thought that I could possibly use the cpu utilization metric.
In testing it, I reset the values to warning and critical thresholds to 0 and 5% respectively to see what would happen. I was emailed with the expected critical alert. In looking at the top sessions on the server, I noticed that 1 session was eating up 100% of one cpu (which I want to know about) but the alert email said that 45% was utilized which I noticed was about what the user load is on the server.
Initially, I had the warning and critical threshold set to 85 and 95% respectively but did not get any warning about a user process that was taking up 100% cpu for > 5 minutes (in which the 5 minute collect times were set to once).
My questions are
1) How do I capture a single process eating up > 90% cpu in a multi-cpu environment
2) Is the cpu utilization % capturing the Average Load of the cpus on the server and alerting when it's above the critical threshold?
3) How is the cpu utilization % calculated?
Help would be appreciated.

The cpu load is determined by running the Grid program nmupm found in $AGENT_HOME/bin
The output is like:
dbc12ykf: PDBGRP> nmupm osCpuUsage
em_result=1|206331806.000000|201540370.000000|102524043.000000|958620752.000000
em_result=2|212731589.000000|201203614.000000|67775500.000000|948506267.000000
em_result=3|212402913.000000|230642957.000000|76833167.000000|917779040.000000
em_result=4|242543014.000000|367865067.000000|81554006.000000|791426607.000000
You will get a line for each cpu.
YOu'll need a bit of reverse engineering to figure out the columns - I think they are user, system, idle , 5min avg - Multiplied by 10000 ?
Now to capture a big one - I think you will need a user defined metric. Just write a simple shell script to run the above command, and evaluate the numbers coming thru.

Xcode 4.4 cpu utilization 100%

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