High CPU usage for AppleVNCServer (Screen Sharing) on Mac Mini (mid 2010)

Steadily around 90-100% (on a dual-core), no browser opened, just iTunes, VLC and a couple of low-impact servers.
I wasn't worried about this since my Mini (no monitor, all Screen Sharing) has always done that but I just realized that Screen Sharing into my iMac or my MBP 13in (mid 2010, same CPU as Mini) does not make them go nearly as high (5-15%).
As a result, it runs pretty hot when I VNC into it.
Any suggestion?

The screensharing CPU issue is still there in Mac OS 10.8.2 :-(
(i have the problem on my mid-2011 mac-mini server)
top sorted by CPU shows clearly two "screensharing"/"Screensharing" processes eating each about 45% CPU

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High CPU usage for webservd

we are seeing a very high CPU usage for webservd. looking at the java stack it seems to be threads communicating to sun one LDAP server.
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Sun ONE Web Server 6.1SP4 B12/16/2004
17393 root 3741M 1655M cpu0 10 0 59:30:33 8.8% webservd/6235
17393 root 3741M 1655M cpu16 10 0 223:58:38 8.7% webservd/5043
17393 root 3741M 1655M cpu17 10 0 545:54:49 8.7% webservd/2902
17393 root 3741M 1655M run 10 0 379:07:26 8.3% webservd/3996
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17393 root 3741M 1655M run 20 0 56:03:44 8.2% webservd/6265
17393 root 3741M 1655M cpu18 30 0 556:18:29 8.2% webservd/2830
17393 root 3741M 1655M cpu3 30 0 548:09:11 8.2% webservd/2890
17393 root 3741M 1655M run 20 0 328:18:42 8.1% webservd/4359
17393 root 3741M 1655M cpu2 30 0 5:11:16 8.1% webservd/6722
17393 root 3741M 1655M run 20 0 181:49:48 8.1% webservd/5322
17393 root 3741M 1655M run 20 0 251:44:35 7.8% webservd/4857
[02/Aug/2006:15:06:16] warning (17393): CORE3283: stderr: "BlockedThread" daemon prio=1
0 tid=0x01110650 nid=0xb56 runnable [0x1714f000..0x1714fc10]
[02/Aug/2006:15:06:16] warning (17393): CORE3283: stderr: at netscape.ldap.LDAPSe
archListener.nextMessage(LDAPSearchListener.java:86)
[02/Aug/2006:15:06:16] warning (17393): CORE3283: stderr: at netscape.ldap.LDAPSe
archListener.getResponse(LDAPSearchListener.java:77)
[02/Aug/2006:15:06:16] warning (17393): CORE3283: stderr: at com.iplanet.services
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[02/Aug/2006:15:06:16] warning (17393): CORE3283: stderr: at java.lang.Thread.run
(Thread.java:595)

forgot to mention: OS is solaris 9

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Hi,
I have a Mac Mini mid-2010 (Model 4.1). I purchased it with 4 Gb RAM, and I am now considering a RAM upgrade.
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Is this true? Anyone tried this?
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HJ

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Maximum Memory
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Memory Slots
2 - 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM

High cpu usage for garbage collection (uptime vs total gc time)

Hi Team,
We have a very high cpu usage issue in the production.
When we restart the server, the cpu idle time would be around 95% and it comes down as days goes by. Today idle cpu is 30% and it is just 6th day after the server restart.
Environemnt details:
Jrockit version:
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
BEA WebLogic JRockit(TM) 1.4.2_05 JVM R24.4.0-1 (build ari-38120-20041118-1131-linux-ia32, Native Threads, GC strategy: parallel)
Gc Algorithm: JRockit Garbage Collection System currently running strategy: Single generational, parallel mark, parallel sweep
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Max Heap Size: 1073741824
Total Garbage Collection Time: 21:43:56.5
Uptime: 114:33:4.1
Total Garbage Collection Count: 420872
Total Number Of Threads: 198
Number Of Daemon Threads: 191
Can you guys please tell me what would be problem in the server which causing the high cpu usage?
One more thing I would like to know is that why the total number of threads is 198 when we specified the Executor pool size as 25? I agree that weblogic would create some threads for its maintenance but around 160 threads!!! something is wrong I guess.
Santhosh.
[email protected]

Hi,
I'm having a similar problem, but haven't been able to resolve it yet. Troubleshooting is made even harder by the fact that this is only happening on our production server, and I've been unable to reproduce it in the lab.
I'll post whatever findings I have and hopefully we'll be able to find a solution with the help of BEA engineers.
In my case, I have a stand-alone Tomcat server that runs fine for about 1-2 days, and then the JVM suddenly starts using more CPU, and as a result, the server load shoots up (normal CPU utilization is ~5% but eventually goes up to ~95%; load goes from 0.1 to 4+).
What I have found so far is that this corresponds to increased GC activity.
Let me list my environment specs before I proceed, though:
CPU: Dual Xeon 3.06GHz
RAM: 2GB
OS: RHEL4.4 (2.6.9-42.0.2.ELsmp)
JVM build 1.5.0_03-b07 (BEA JRockit(R) (build dra-45238-20050523-2008-linux-ia32, R25.2.0-28))
Tomcat version 5.5.12
JAVA_OPTS="-Xms768m -Xmx768m -XXtlasize16k -XXlargeobjectlimit16k -Xverbose:memory,cpuinfo -Xverboselog:/var/log/tomcat5/jvm.log -Xverbosetimestamp"
Here are excerpts from my verbose log (I'm getting some HT warning, not sure if that's a problem):
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Detected SMP with 2 CPUs that support HT.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to determine if HT is enabled.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to read from /dev/cpu/0/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: Failed to read from /dev/cpu/0/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Trying to read from /dev/cpu/1/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: Failed to read from /dev/cpu/1/cpuid
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] HT is: supported by the CPU, not enabled by the OS, enabled in JRockit.
[Fri Oct 20 15:54:18 2006][22855][cpuinfo] Warning: HT enabled even though OS does not seem to support it.
[Fri Oct 20 15:54:55 2006][22855][memory ] GC strategy: System optimized over throughput (initial strategy singleparpar)
[Fri Oct 20 15:54:55 2006][22855][memory ] heap size: 786432K, maximal heap size: 786432K
[Fri Oct 20 16:07:30 2006][22855][memory ] Changing GC strategy to generational, parallel mark and parallel sweep
[Fri Oct 20 16:07:30 2006][22855][memory ] 791.642-791.874: GC 786432K->266892K (786432K), 232.000 ms
[Fri Oct 20 16:08:02 2006][22855][memory ] 824.122: nursery GC 291998K->274164K (786432K), 175.873 ms
[Fri Oct 20 16:09:51 2006][22855][memory ] 932.526: nursery GC 299321K->281775K (786432K), 110.879 ms
[Fri Oct 20 16:10:24 2006][22855][memory ] 965.844: nursery GC 308151K->292222K (786432K), 174.609 ms
[Fri Oct 20 16:11:54 2006][22855][memory ] 1056.368: nursery GC 314718K->300068K (786432K), 66.032 ms
[Sat Oct 21 23:21:09 2006][22855][memory ] 113210.427: nursery GC 734274K->676137K (786432K), 188.985 ms
[Sat Oct 21 23:30:41 2006][22855][memory ] 113783.140: nursery GC 766601K->708592K (786432K), 96.007 ms
[Sat Oct 21 23:36:15 2006][22855][memory ] 114116.332-114116.576: GC 756832K->86835K (786432K), 243.333 ms
[Sat Oct 21 23:48:20 2006][22855][memory ] 114841.653: nursery GC 182299K->122396K (786432K), 175.252 ms
[Sat Oct 21 23:48:52 2006][22855][memory ] 114873.851: nursery GC 195060K->130483K (786432K), 142.122 ms
[Sun Oct 22 00:01:31 2006][22855][memory ] 115632.706: nursery GC 224096K->166618K (786432K), 327.264 ms
[Sun Oct 22 00:16:37 2006][22855][memory ] 116539.368: nursery GC 246564K->186328K (786432K), 173.888 ms
[Sun Oct 22 00:26:21 2006][22855][memory ] 117122.577: nursery GC 279056K->221543K (786432K), 170.367 ms
[Sun Oct 22 00:26:21 2006][22855][memory ] 117123.041: nursery GC 290439K->225833K (786432K), 69.170 ms
[Sun Oct 22 00:29:10 2006][22855][memory ] 117291.795: nursery GC 298947K->238083K (786432K), 207.200 ms
[Sun Oct 22 00:39:05 2006][22855][memory ] 117886.478: nursery GC 326956K->263441K (786432K), 87.009 ms
[Sun Oct 22 00:55:22 2006][22855][memory ] 118863.947: nursery GC 357229K->298971K (786432K), 246.643 ms
[Sun Oct 22 01:08:17 2006][22855][memory ] 119638.750: nursery GC 381744K->322332K (786432K), 147.996 ms
[Sun Oct 22 01:11:22 2006][22855][memory ] 119824.249: nursery GC 398678K->336478K (786432K), 93.046 ms
[Sun Oct 22 01:21:35 2006][22855][memory ] 120436.740: nursery GC 409150K->345186K (786432K), 81.304 ms
[Sun Oct 22 01:21:38 2006][22855][memory ] 120439.582: nursery GC 409986K->345832K (786432K), 153.534 ms
[Sun Oct 22 01:21:42 2006][22855][memory ] 120443.544: nursery GC 410632K->346473K (786432K), 121.371 ms
[Sun Oct 22 01:21:44 2006][22855][memory ] 120445.508: nursery GC 411273K->347591K (786432K), 60.688 ms
[Sun Oct 22 01:21:44 2006][22855][memory ] 120445.623: nursery GC 412391K->347785K (786432K), 68.935 ms
[Sun Oct 22 01:21:45 2006][22855][memory ] 120446.576: nursery GC 412585K->348897K (786432K), 152.333 ms
[Sun Oct 22 01:21:45 2006][22855][memory ] 120446.783: nursery GC 413697K->349080K (786432K), 70.456 ms
[Sun Oct 22 01:34:16 2006][22855][memory ] 121197.612: nursery GC 437378K->383392K (786432K), 165.771 ms
[Sun Oct 22 01:37:37 2006][22855][memory ] 121398.496: nursery GC 469709K->409076K (786432K), 78.257 ms
[Sun Oct 22 01:37:37 2006][22855][memory ] 121398.730: nursery GC 502490K->437713K (786432K), 65.747 ms
[Sun Oct 22 01:44:03 2006][22855][memory ] 121785.259: nursery GC 536605K->478156K (786432K), 132.293 ms
[Sun Oct 22 01:44:04 2006][22855][memory ] 121785.603: nursery GC 568408K->503635K (786432K), 71.751 ms
[Sun Oct 22 01:50:39 2006][22855][memory ] 122180.985: nursery GC 591332K->530811K (786432K), 131.831 ms
[Sun Oct 22 02:13:52 2006][22855][memory ] 123573.719: nursery GC 655566K->595257K (786432K), 117.311 ms
[Sun Oct 22 02:36:04 2006][22855][memory ] 124905.507: nursery GC 688896K->632129K (786432K), 346.990 ms
[Sun Oct 22 02:50:24 2006][22855][memory ] 125765.715-125765.904: GC 786032K->143954K (786432K), 189.000 ms
[Sun Oct 22 02:50:26 2006][22855][memory ] 125767.535-125767.761: GC 723232K->70948K (786432K), 225.000 ms
vvvvv
[Sun Oct 22 02:50:27 2006][22855][memory ] 125768.751-125768.817: GC 712032K->71390K (786432K), 64.919 ms
[Sun Oct 22 02:50:28 2006][22855][memory ] 125769.516-125769.698: GC 711632K->61175K (786432K), 182.000 ms
[Sun Oct 22 02:50:29 2006][22855][memory ] 125770.753-125770.880: GC 709632K->81558K (786432K), 126.000 ms
[Sun Oct 22 02:50:30 2006][22855][memory ] 125771.699-125771.878: GC 708432K->61368K (786432K), 179.000 ms
So, I'm running with the default GC strategy which lets the GC pick the most suitable approach (single space or generational). It seems to switch to generational almost immediately and runs well - most GC runs are in the nursery, and only once in a while it goes through the older space.
Now, if you look at [Sun Oct 22 02:50:27 2006], that's when everything changes. GC starts running every second (later on it's running 3 times a second) doing huge sweeps. It never goes through the nursery again, although the strategy is still generational.
It's all downhill from this point on, and it's a matter of hours (maybe a day) before we restart the server.
I guess my only question is: What would cause such GC behavior?
I would appreciate your ideas/comments!
Thanks,
Tenyo

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Hi,
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Hi Gopi,
Check out Tim's reply and check for ur Java stack settings,
Extended Memory parameters
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<i>[Reward if helpful]</i>
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I have a brand new Satelitte T130.
From unboxing, I remarked that CPU usage is most of the time very high, even when doing nothing (no applications are running).
It sometimes hits 100% and stays ther for a few minutes.
I installed the newest BIOST I could find on the Toshiba site, but nothing changes.
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I don't like this just-out-the-box-unit already causes troubles!

Hi mate
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We have the following setup which hosts a JAVA client application:
A Netra T12 which is used as a GUI server + SGD server.
A 490 acting as another GUI server.
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Hello,
In iTunes, various tasks take 3-4 seconds to happen/start (rating a song, scrolling up and down within a list of songs, etc.), and I get either rainbow wheel or lag/nothing happening (or both) in the meantime. I did not notice this problem before the new (11) version of iTunes, and no other apps/programs are having issues of any kind. I checked CPU usage while changing the rating of a song and it went to about 55% for 5 seconds or so. That can't be right... it just can't. Is this some kind of bug in iTunes or is there something (simple!) I can do to fix it?
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Message was edited by: earthimmigrant (clarifying the issue a bit better)

forgot to mention: OS is solaris 9

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I urge all of you to duplicate my results!
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Subject:
Root Cause Identified for Case 20244XXXX!
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Hello Annette, Jim and Steve,
Please see the attached screenshots.
Engineering, especially test engineering, needs to look at this! When this is resolved Steve can go on stage and show another Safari feature that is superior to Camino, Chrome and Firefox, etc. (I was able to replicate part of this using several boxes at a local Apple Store about a week ago!)
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8. Make Safari much more resource efficient than any other browser.
Steve can then demo this to the world and everyone will have another insanely great day!
Thanks for another great demo today Steve.
John
The long and short of it is that many websites today are very resource intensive. The workaround is to share the load among two to four different browsers. This workaround works every time. The browser-builders will have to make the final fixes.
Thanks,
John

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forgot to mention: OS is solaris 9

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High CPU usage for AppleVNCServer (Screen Sharing) on Mac Mini (mid 2010)

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