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常用Linux命令详解（持续更新） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...间等）（ls -l 等同于 ll 命令）
[root@KEDACOM ~]# ls -l
total 64
-rw-r--r-- 1 root root 0 Jun 29 17:50 NRU_CMU_DISK_SIZE_NOTIFY2008
-rw-r--r-- 1 root root 933 Jan 10 2002 anaconda-ks.cfg 文件
drw-r--r-- 1 root root 49431 Jan 10 2002 install 目录
-r...
Platform independent size_t Format specifiers in c?
...nt variable types on different architectures. For example, on one machine (64-bit) the following code does not throw any warnings:
...
Why is the C++ STL is so heavily based on templates? (and not on *interfaces*)
...
AraKAraK
84.6k3232 gold badges170170 silver badges228228 bronze badges
AtomicInteger lazySet vs. set
...rve as a soft barrier costing 20 cycles on nehelem intel cpu)
on x86 (x86_64) such a barrier is much cheaper performance-wise than volatile or AtomicLong getAndAdd ,
In an one producer, one consumer queue scenario, xchg soft barrier can force the line of codes before the lazySet(sequence+1) for p...
How does this code generate the map of India?
... while (a != 0) {
a = bits[b];
b++;
while (a > 64) {
a--;
if (++c == 'Z') {
c /= 9;
putchar(c);
} else {
putchar(33 ^ (b & 0x01));
}
}
}
return 0;
}
The s...
How to convert an array of strings to an array of floats in numpy?
...port numpy as np
a = ["1.1", "2.2", "3.2"]
b = np.asarray(a, dtype=np.float64, order='C')
For Python 2*:
print a, type(a), type(a[0])
print b, type(b), type(b[0])
resulting in:
['1.1', '2.2', '3.2'] <type 'list'> <type 'str'>
[1.1 2.2 3.2] <type 'numpy.ndarray'> <type 'num...
Programmatically retrieve memory usage on iPhone
...mach_task_basic_info. My guess is that this version is not compatible with 64-bit architecture, but not really sure.
– cprcrack
Oct 30 '13 at 18:16
14
...
convert double to int
...ze of an int is always 32 bits, regardless of whether you're using a 32 or 64 bit machine.
– Joren
Nov 15 '10 at 10:15
3
...
How to find where gem files are installed
...MS VERSION: 2.1.5
- RUBY VERSION: 2.0.0 (2013-06-27 patchlevel 247) [x86_64-darwin12.4.0]
- INSTALLATION DIRECTORY: /Users/ttm/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0
- RUBY EXECUTABLE: /Users/ttm/.rbenv/versions/2.0.0-p247/bin/ruby
- EXECUTABLE DIRECTORY: /Users/ttm/.rbenv/versions/2...
Parameterize an SQL IN clause
...
spencer7593spencer7593
96.4k1313 gold badges9292 silver badges113113 bronze badges
...