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工信部新批电信199/移动198/联通166

工信部新批电信199/移动198/联通166

新号段来了:工信部新批电信199/移动198/联通166

2017-08-08 11:37 来源:澎湃新闻字号据工业和信息化部(工信部)网站8月8日发布的信息,

工信部新批电信199/移动198/联通166,另外还有146联通,148移动,1740、1741电信和工信部的卫星通信号段,144十三位移动物联网,141十三位电信物联网,10098船舶通信导航公司客服电话等。

来源: 新号段来了:工信部新批电信199/移动198/联通166_10%公司_澎湃新闻-The Paper

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Brands On Sale, Clearance | 6pm.com

Brands On Sale, Clearance | 6pm.com

We offer 1227 of Your Favorite Brands – with More on the Way!

All Brands – 1227 Total

BOLD = New Styles in Brand

来源: Brands On Sale, Clearance | 6pm.com

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Under Armour Size Charts

Under Armour Size Charts

Many people are hesitant to order online because of fit. Will it be too tight? Too loose? Too short? Or too long? Will it be the right cut for my body type? Is it supposed to fit like this? To help ease the uncertainty, we’ve put together a comprehensive fit guide. It will walk you through the various steps to finding the right UA fit for all our gear.

Under Armour® performance gear was built to be consistent with traditional sizing parameters. This means if you normally wear a “Large” T-shirt, you would also wear a “Large” UA T-shirt. So please order accordingly…and with confidence.

来源: Under Armour Size Charts | US

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Instagram 5位传奇工程师背后的技术揭秘(PPT)-CSDN.NET

Instagram 5位传奇工程师背后的技术揭秘(PPT)-CSDN.NET

Instagram,一家基于iOS和Android的社交图片照片分享应用开发商,以独特的运营理念,在仅有5位工程师,团队共有13人的情况下,成功将自己以7.5亿美元出售给Facebook。奇迹的背后,是“为尽量减少运维负担而优化,监控一切,简洁的技术主张”。

来源: Instagram 5位传奇工程师背后的技术揭秘(PPT)-CSDN.NET

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一起并发场景下错误使用HashMap的Case

一起并发场景下错误使用HashMap的Case

前段时间遇到了好几次HashMap造成的系统Load飙高,耗光CPU的事情,大家也进行了排查,找到了原因。林昊大神就这个问题,发表了两篇深入的分析:《又一起并发场景下错误使用HashMap的Case》(http://hello java.info/?p=31)以及《并发场景下HashMap.get导致cpu耗光的原因分析》(http://hello java.info/?p=45)。网友@fire对原因的一句话描述:

出现死循环是因为map中的桶链表出现了循环链表,循环链表是因为并发put操作造成的,同时进行了resize();如果只有一个线程进行put操作,是不会出现循环链表,所以读写并发不会出现死循环,只有写写并发才有可能出现死循环。

第一次听说林仕鼎的大名是在12306第一次被春运整趴下,多路高手为它出谋划策的时候,后来才知道林仕鼎是百度的大牛,今年年初时,百度搞了南京数据中心开放日的活动,介绍了百度新一代数据中心的情况,最近InfoQ对林仕鼎做了个采访,了解了下他对数据中心计算的一些想法:《林仕鼎谈数据中心计算(一):整体大于部分之和》(http://www.infoq.com/cn/articles/linshiding-on-sddc-design-01)、《林仕鼎谈数据中心计算(二):存储资源分层》(http://www.infoq.com/cn/articles/linshiding-on-sddc-design-02)。

来源: 每周推荐阅读2013Q2汇总 – DigitalSonic的自留地 – ITeye技术网站

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Instagram Architecture Update: What’s new with Instagram? – High Scalability –

Instagram Architecture Update: What’s new with Instagram? – High Scalability –

Instagram Architecture Update: What’s New With Instagram?

The fascination over Instagram continues and fortunately we have several new streams of information to feed the insanity. So consider this article an update to The Instagram Architecture Facebook Bought For A Cool Billion Dollars, based primarily on Scaling Instagram, a slide deck for an AirBnB tech talk given by Instagram co-founder, Mike Krieger. Several other information sources, listed at the bottom of the article, were also used.

Unfortunately we just have a slide deck, so the connective tissue of the talk is missing, but it’s still very interesting, in the same spirit of wisdom presentations we often see after developers come up for air after spending significant time spent in the trenches.

If you expect to dive deep into the technological details and find a billion reasons why Instagram was acquired, you will be disappointed. That magic can be found in the emotional investment in the relationship between all of the users and the product, not in the bits about how they bytes are managed.

来源: Instagram Architecture Update: What’s new with Instagram? – High Scalability –

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Munin

Munin

Munin the monitoring tool surveys all your computers and remembers what it saw. It presents all the information in graphs through a web interface. Its emphasis is on plug and play capabilities. After completing a installation a high number of monitoring plugins will be playing with no more effort.

Using Munin you can easily monitor the performance of your computers, networks, SANs, applications, weather measurements and whatever comes to mind. It makes it easy to determine “what’s different today” when a performance problem crops up. It makes it easy to see how you’re doing capacity-wise on any resources.

Munin uses the excellent RRDTool (written by Tobi Oetiker) and the framework is written in Perl, while plugins may be written in any language. Munin has a master/node architecture in which the master connects to all the nodes at regular intervals and asks them for data. It then stores the data in RRD files, and (if needed) updates the graphs. One of the main goals has been ease of creating new plugins (graphs).

来源: Munin

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