The core part of an operating system.
2
votes
1answer
42 views
How do I read this Activity Monitor report?
I was trying to figure out why my Mountain Lion server was running slow, and I when I opened Activity Monitor this is what I saw:
Question 1: how am I getting >400% of CPU on the summed CPU column, ...
0
votes
1answer
15 views
Kernel Tasks Swamping processor-2012 13" Retina
Acquired a 13" Retina liquid damaged - Apple Certified Tech. Trying to salvage.
Haven't disassembled yet to see the extent of the liquid but it boots and runs. No liquid spill indicators triggered. ...
0
votes
1answer
3k views
Errors on kernel.log… how do I fix them?
My mac is apparently working fine, no crashes of any kind, but my kernel.log is full of errors and that is worrying me, as I never saw it with messages like that. This is a sample of today, since I ...
1
vote
1answer
372 views
How to unload kernel modules
When I run kextstat, it gives me a list of the currently loaded kernel modules. How to I go about using the information gathered from this command to unload a kernel module?
-4
votes
0answers
62 views
Did Steve Jobs invent the kernel that Mac OSX and iOS use himself from scratch? [closed]
I've heard that Mac OSX came from another kernel, and was forked, expanded, or changed and given another name(i.e., possibly "stolen" can fit somewhere here as well). Is that true?
Was Mac OSX just a ...
0
votes
1answer
256 views
Why is `/etc/sysctl.conf` not determining my `kern.maxfiles` setting?
I've been having a persistent "too many open files in system" error on my machine (OSX 10.7.5).
When I run sysctl kern.maxfiles and sysctl kern.maxfilesperproc, both output 2048.
This article says ...
0
votes
0answers
104 views
MacBook unusable due to kernel_task
I've disabled hibernation, and removed the sleep image file. I shutdown my Macbook Pro (15" retina), unticked the box to open windows on restart, and started my MacBook again. As soon as I'd logged on ...
1
vote
1answer
247 views
TrueCrypt fails with fusefs kext error
After upgrading to Mountain Lion, I can't mount any volumes with TrueCrypt 7.1a anymore. After typing in the password for the volume, an error message is shown, stating that the fusefs kext can't be ...
1
vote
1answer
111 views
Can one influence Mac OS X's / Darwin's filesystem caching behaviour?
I have the following problem: When I run processes that consume a lot of memory, Mac OS X seems to refuse to release a large portion of the filesystem cache:
In fact, instead of letting go of the ~ ...
2
votes
2answers
881 views
How can I stop fseventsd for certain volumes?
I also have a partion with Ubuntu installed. Unfortunately, every time I have an error while working on the Ubuntu partion (I believe it's ext3), I get a Kernel Panic and I have to restart. I believe ...
1
vote
1answer
164 views
What the heck is “npvhash=4095”?
I've been using Mac for 15 years, and I've had relatively few problems.
Many years ago, I was using a MBP 17" which sometimes was completely freezing: the only way to wake it was to hard-reset it ...
0
votes
0answers
26 views
What can cause multiple processes on Mac with the same PID in some cases?
why there are many similar processes running at the same time. For instance : 2 SystemUIServer, same Pid, same user both Ipv4 type or 14 mdsnresponder, pid 29 half iPv4 and ipv6 types.
0
votes
1answer
119 views
What is writing to Disk causing eventual Beach-ball-of-death
What is running my machine down? This is iotop output...I still can't tell what is driving my system to a halt. Command+i on the SSD shows my "used space" slowly changing. It does this for about an ...
1
vote
0answers
194 views
How do I increase “ulimit -u” (max user processes)?
I can change all of the usual ulimits via (for instance) ulimit -n 8192 and launchctl limit maxfiles 8192 8192. Somehow, this doesn't seem to work for -u, the maximum number of user processes:
~$ ...
3
votes
2answers
2k views
How to properly increase ulimit -n on Lion?
I'm trying to download the X-Plane 10 Demo through uTorrent, however I get a "too many open files" error all the time. I can do the alternate download (which takes forever and a day), but I wonder how ...
8
votes
2answers
3k views
Too Many Open Files
Which command / configuration file controls the open file limits on OS X? Is there a different command for OS X 10.5 / 10.6 / 10.7? The options I explore below are ulimit, sysctl, and launchctl
...
2
votes
2answers
1k views
Where can I download the Darwin 12.2.0 source code?
I'm wondering where I can download the source code of the kernel of Mac OS X Mountain Lion 10.8.2: Darwin 12.2.0.
I googled it, but its hard to find. And yes, I tried http://www.opensource.apple.com.
...
1
vote
2answers
227 views
Mach Kernel vs. XNU
When I ran $ls on my root directory a file /mach_kernel was found. I'm assuming this is the OSX kernel. I always thought that OSX used the XNU hybrid kernel, so why is this file called "MACH"? I'm ...
0
votes
1answer
574 views
“Too many open files” - how can I set the ulimit -n value for emacs on Lion?
I've seen other questions covering the topic of how to set the file limit on Leopard/Lion.
For example:
How to properly increase ulimit -n on Lion?
Too Many Open Files
But after reading ...
0
votes
1answer
306 views
What bitness is Mountain Lion kernel, because `uname -p` returns `i386`?
I know, the answer should be 64, as Apple dropped support even for their early 64 bit models BUT:
Nathan-der-Graue:~ max$ uname -p
i386
while on the other hand:
Could someone please clear this ...
2
votes
1answer
493 views
What's the maximum pid for Mac OS X?
The Mac OS X Internals book states that the maximum process identifier is 30,000 and after that the kernel will start re-using pids. But checking on my own system, via:
ps a | grep ps | grep -v grep ...
3
votes
4answers
2k views
How to know my kernel extensions are 64-bit ready?
Is there an easy way to tell whether all my kernel extensions will "survive" booting with a 64 bit kernel? I can of course try the "6-4 finger boot", but maybe there is a piece of hardware I use ...
3
votes
2answers
230 views
Is it possible to specify a different root device to a MacOS kernel?
I have an old iBook (2003, G4) with a burnt-out harddrive. Being a poor academic, I don't want to bother with replacing the drive. I'd like to use an external USB drive in place of the harddrive. I ...
0
votes
1answer
143 views
Disadvantages of 32 bit mode
I have a Cisco VPN client in OSX 10.6.8, which runs only in 32 bit mode.
Are there any serious disadvantages of switching to 32 bit mode permanently?
4
votes
1answer
2k views
Keep getting this kernel panic
I keep getting this kernel panic once a week and a half roughly. It freezes the computer (2010ish 17" MBP), showing this error:
And giving this error dump on reboot:
Interval Since Last Panic ...
1
vote
2answers
239 views
64 bit support with a 32 bit kernel in OS X Snow Leopard
I know that many apple laptops such as my Macbook 6,1 run a 32 bit kernel in OS X Snow Leopard. The kernel according to Apple can also run or "support" 64 bit applications. My question is how does the ...
1
vote
2answers
407 views
Serious system issue - kernel extensions installed improperly
I have just gotten an error message for every single kext file there is.
the error message goes something along the lines of:
The system extension "file path" was installed improperly and cannot be ...
2
votes
1answer
4k views
What exactly does kernel_task do?
I'd just like to know what it is that kernel_task is responsible for. Also, what's an acceptable maximum RAM and CPU use for it?
3
votes
2answers
852 views
I see thousands of these in my Console log
8/5/11 5:21:37 PM kernel FireWire GUID ffffffffffffffff is invalid!
I have a Macbook Pro Core 2 Duo running Snow Leopard. Any suggestions?
7
votes
3answers
700 views
How to get a mac to wait longer for external disk to wake up upon resuming from sleep?
My Mac has an external disk attached, and I often get "disk not ejected properly" warnings after resuming the computer from sleep. These warnings appear only when the disk has spun down during the ...
0
votes
1answer
490 views
Is it possible to switch from Safe Mode to Normal and back without a reboot?
Since 10.6.3, Apple has decided change the AppleIntelCPUManagement kexts, which leave me stuck with a kernel_task that pegs out at 135-185%, generating a lot of heat.
Anyway, since I doubt anyone has ...
3
votes
3answers
2k views
Kernel panics; Apple hardware test error codes… Bad memory?
My MacMini, which I bought new around Thanksgiving 2010 from Amazon, has been having quite a few kernel panics. They aren't consistent in any way, but they have become more frequent and now many apps ...
0
votes
1answer
503 views
Why isn't my MacBook running 64 bit mode? [duplicate]
Possible Duplicate:
My mac has 64-bit EFI, but it only boots with 32-bit kernel
Why isn't my MacBook running 64 bit mode? It's a mid-2010 model, "MacBook 7,1" , with a Core-2 Duo. why would ...
1
vote
5answers
1k views
My mac has 64-bit EFI, but it only boots with 32-bit kernel
I followed the guide at
http://macperformanceguide.com/SnowLeopard-64bit.html
to boot into 64-bit mode. I had no problems with the instructions and on the boot screen it says "PAE enabled, 64bit mode ...
3
votes
3answers
575 views
Interesting Mac OS X error
Has anyone ever seen an error like the one pictured below on Mac OS X? What is it? The system is 10.6.6. I'm quite experienced in OS X but I've never seen such a thing. I was booting in verbose modem, ...
3
votes
1answer
585 views
File location of kernel extensions?
Is there an easy way to make the mapping from kernel extension to the file it came from?
I can get the list of currently loaded kernel extension via kextstat. This gives me the bundle names, like ...
