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What is the difference between user and kernel modes in operating systems?
...ttp://wiki.osdev.org/Global_Descriptor_Table
the segment registers CS, DS, etc., which point to the index of an entry in the GDT.
For example, CS = 0 means the first entry of the GDT is currently active for the executing code.
What can each ring do?
The CPU chip is physically built so that:
...
Is PHP compiled or interpreted?
... performance penalty as PHP recompiles my source code for every request?", etc.)
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How do cache lines work?
... a rule of thumb, if the processor can't forecast a memory access (and prefetch it), the retrieval process can take ~90 nanoseconds, or ~250 clock cycles (from the CPU knowing the address to the CPU receiving data).
By contrast, a hit in L1 cache has a load-use latency of 3 or 4 cycles, and a store...
How to determine whether a given Linux is 32 bit or 64 bit?
...et your specific machine hardware name run
uname -m
You can also call
getconf LONG_BIT
which returns either 32 or 64
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How to capture no file for fs.readFileSync()?
...tead pass the error in the callback and handle it there: fs.readFile('/etc/passwd', (err, data) => { if (err) throw err; console.log(data); }); from: nodejs.org/dist/latest-v12.x/docs/api/…
– K.H. B
Mar 30 at 16:44
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node.js remove file
...o check files can be deleted or not, Use fs.access instead
fs.access('/etc/passwd', fs.constants.R_OK | fs.constants.W_OK, (err) => {
console.log(err ? 'no access!' : 'can read/write');
});
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if arguments is equal to this string, define a variable like this string
... r)
SERVER=$OPTARG
;;
p)
PASSWD=$OPTARG
;;
v)
VERBOSE=1
;;
?)
usage
exit
;;
esac
done
if [[ -z $TEST ]] || [[ -z $SERVER ]] || [[ -z $PASSWD ]]
then...
Having Django serve downloadable files
...t the user can potentially download any file (ie. what if you pass "f=/etc/passwd" ?) There are a lot of things that help prevent this (user permissions, etc), but just be aware of this obvious but common security risk. It's basically just a subset of validating input: If you pass in a filename to...
How to discover number of *logical* cores on Mac OS X?
...et "error: "hw.ncpu" is an unknown key". There is no cpu related entry in /etc/sysctl.conf as well. Frozen Flame's answer worked.
– TheGT
Oct 5 '16 at 23:39
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Is volatile expensive?
...functions providing additional functionality like getAndSet, compareAndSet etc., so from a performance point of view using it is just useful if you need the added functionality. But I wonder why you refer to the OS here? The functionality is implemented in CPU opcodes directly. And does this imply t...