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海量数据相似度计算之simhash短文本查找 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...快的返回一个value，这个号称查找速度最快的数据结构是如何实现的呢？看下hashmap的内部结构：
如果我们需要得到key对应的value，需要经过这些计算，传入key，计算key的hashcode，得到7的位置；发现7位置对应的value还有好几个，...
Redis 的性能幻想与残酷现实 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...真实性能指标，区分清幻想和现实。我们才能真正考虑好如何合理的利用 Redis 的多功能特性，并有效规避的它的弱项，再给出一些 Redis 的使用建议：
-根据数据性质把 Redis 集群分类；我的经验是分三类：cache、buffer 和 db
- cache...
Using logging in multiple modules
...logging.config.fileConfig('logging.conf')' stmt. this stmt is actually the root cause of my concern. you see, if i have initiate the logger in every module, i would have to type this stmt in every module. that would mean tracking the path of conf file in every module, which does not look like a best...
Linux查看哪些进程被OOM killer干掉 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...-linux-oom-killergrep -i & 39;killed process& 39; var log messages 需要root权限dmesg -T | egrep -i & 39;killed process& 39; 无需知道日志位置，无需root权
grep -i 'killed process' /var/log/messages #需要root权限
dmesg -T | egrep -i 'killed process' #无需...
Find running median from a stream of integers
...Add next item to one of the heaps
if next item is smaller than maxHeap root add it to maxHeap,
else add it to minHeap
Step 2: Balance the heaps (after this step heaps will be either balanced or
one of them will contain 1 more item)
if number of elements in one of the heaps is greater ...
How to force an entire layout View refresh?
...EditText should be visible then in ScrollView, but I was unable to refresh root view to take effect.
I solved my problem, when I need to refresh the view so I changed the ScrollView visibility to GONE and then again set it to VISIBLE to take effect and it worked for me. This is not the exact soluti...
How to RSYNC a single file?
.... In your example:
rsync -avz --progress /var/www/public_html/.htaccess root@<remote-ip>:/var/www/public_html/
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Find all files in a directory with extension .txt in Python
...file))
or if you want to traverse directory, use os.walk:
import os
for root, dirs, files in os.walk("/mydir"):
for file in files:
if file.endswith(".txt"):
print(os.path.join(root, file))
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How do I find which rpm package supplies a file I'm looking for?
...
Furthermore, yum whatprovides ... only requires root if the application is a root package (i.e. it resides in /sbin). However, rpm -qf ... also requires root in order to read rpms from /sbin. Therefore, I propose that the root requirements are functionally equivalent for b...
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
...一组返回的是基本信息，另一组返回的是扩展信息。
1、如何判断CPU是否支持CPUID指令
前面说过，大概是从80486开始才有的cpuid这个指令，是不是所有的80486家族CPU都有这个指令我也不是很清楚，但在EFLAGS中的bit 21可以识别CPU...