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What is the difference between user and kernel modes in operating systems?
...and unrestricted
access to the underlying hardware. It
can execute any CPU instruction and
reference any memory address. Kernel
mode is generally reserved for the
lowest-level, most trusted functions
of the operating system. Crashes in
kernel mode are catastrophic; they
will halt the...
Is gettimeofday() guaranteed to be of microsecond resolution?
... for Intel Processors
If you're on Intel hardware, here's how to read the CPU real-time instruction counter. It will tell you the number of CPU cycles executed since the processor was booted. This is probably the finest-grained counter you can get for performance measurement.
Note that this is t...
How to discover number of *logical* cores on Mac OS X?
...
You can do this using the sysctl utility:
sysctl -n hw.ncpu
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Is PHP compiled or interpreted?
...
"object code" is just bytecode for the CPU's instruction decoder. (You don't think that CPUs actually have native instructions like "CMPSB", right?)
– jrockway
Oct 3 '09 at 20:58
...
How to determine whether a given Linux is 32 bit or 64 bit?
... ==> 32-bit kernel
Otherwise, not for the Linux kernel, but for the CPU, you type:
cat /proc/cpuinfo
or:
grep flags /proc/cpuinfo
Under "flags" parameter, you will see various values: see "What do the flags in /proc/cpuinfo mean?"
Among them, one is named lm: Long Mode (x86-64: amd64, a...
lua和c/c++互相调用实例分析 - C/C++ - 清泛网 - 专注C/C++及内核技术
..."栈"上，然后获取数据，栈中的每个数据通过索引值进行定位，索引值为正时表示相对于栈底的偏移索引，索引值为负时表示相对于栈顶的偏移索引，索引值以1或-1为起始值，因此栈顶索引值永远为-1 ,栈底索引值永远为1 。 "栈"...
Is volatile expensive?
...n the page I see that LoadLoad and LoadStore are effectively no-ops on X86 CPUs. Does this mean that volatile read operations can be done without a explicit cache invalidation on x86, and is as fast as a normal variable read (disregarding the reordering constraints of volatile)?
...
Why is Node.js single threaded? [closed]
...In my opinion that theory's been borne out. A node.js app that isn't doing CPU intensive stuff can run thousands more concurrent connections than Apache or IIS or other thread-based servers.
The single threaded, async nature does make things complicated. But do you honestly think it's more complica...
Multiprocessing vs Threading Python [duplicate]
...m though if there are too many processes being spawned too often since the CPU might run out of processes/memory. But it can be the same in case of too many threads spawned too often but still lesser overhead than multiple processes. Right?
– TommyT
Feb 23 '15 ...
Linux反编译全攻略 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...48000=0x988，我们按 return 键，打开 go to 窗口，输入 0x988 ，定位到08048988处，改代码为e830000000。改完后，“ ./cm2 ”运行程序，OK。出现 crackme 窗口了。
第二个任务，找出正确的注册码。
为保持本文一个苗条的身材及加大本文所...