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20个命令行工具监控 Linux 系统性能 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...包括 TCP 标志信息、ICMP 详细细节、TCP/UDP 流量故障、TCP 连接的数据包和拜恩计数。并且它还收集 TCP，UDP，ICMP，IP，非 IP，IP 校验错误，界面活性等一般信息和详细信息的接口统计数据。
10. Psacct 或者 Acct — 监视用户活动
Psacct...
Converting RGB to grayscale/intensity
When converting from RGB to grayscale, it is said that specific weights to channels R, G, and B ought to be applied. These weights are: 0.2989, 0.5870, 0.1140.
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Removing first x characters from string?
How might one remove the first x characters from a string? For example, if one had a string lipsum , how would they remove the first 3 characters and get a result of sum ?
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Prevent body scrolling but allow overlay scrolling
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– BlackPanther
Jul 27 '16 at 18:05
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show 10 more comments
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Styling Google Maps InfoWindow
I've been attempting to style my Google Maps InfoWindow , but the documentation is very limited on this topic. How do you style an InfoWindow ?
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为什么说自媒体到了最危险的时期？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...科技自媒体人社群，关注的是如何把生产内容的人有机的连接在一起。科技自媒体发展到现在这个阶段，相应的对于自媒体人的组织也提出了新的要求，不再仅仅是人员数量的简单集合，也不是纯粹的内容采集，而是把一群真正...
Select first row in each GROUP BY group?
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On Oracle 9.2+ (not 8i+ as originally stated), SQL Server 2005+, PostgreSQL 8.4+, DB2, Firebird 3.0+, Teradata, Sybase, Vertica:
WITH summary AS (
SELECT p.id,
p.customer,
p.total,
ROW_NUMBER() OVER(PARTITION BY p.customer
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Test if a command outputs an empty string
...ent that is being checked, otherwise empty results will result in a syntax error as there is no second argument (to check) given!
Note: that ls -la always returns . and .. so using that will not work, see ls manual pages. Furthermore, while this might seem convenient and easy, I suppose it will bre...
Executors.newCachedThreadPool() versus Executors.newFixedThreadPool()
...ough the docs..the problem is...fixedThreadPool is causing a out of memory error @ 3 threads.. where as cachedPool is internally creating only a single thread..on increasing the heap size i am getting the same performance for both..is there anything else i am missing!!
– hakis...
What's the fastest algorithm for sorting a linked list?
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answered Oct 6 '09 at 12:05
cslcsl
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