Thinking about uses for (system) activity tracers
System activity tracers are a hot topic, with the best known one beingSun's DTrace. In thinking about this issue recently, I believe thatthere are three sorts of questions that they can be used to answer,or at least that I'm interested in having answered:
- what is my system doing?
Performance related tracing is one obvious subset of this, both inthe 'what is taking all the time' sense and in the 'how long doessome operation take' sense.
- why is my system
周日一個人在冠男軒飲早茶
周日早起
寫稿讀報看電視
好不容易消磨到七點
肚餓
貪得意
去了多年沒去的冠男軒飲早茶
叫了著名的叉燒飯
拿出相機來拍照
引來幾位叔叔伯伯的注意
於是大家就非常街坊式的吹起水來
我們之間的談話
由梁朝偉點解要娶劉嘉玲
到政府
在此立誓
眼
文學旅遊驚喜
今朝u magazine文學旅行開動，實在欣喜。遭受日曬雨淋，團友不但沒有吐過不滿，連臉色都是怡然的，一直很有耐心地聽。而且並非字花塘水滾塘魚，竟有四份之三的參加者並非字花讀者，可見文學本有潛在巿場，當然，也是U magazine的
tonight..
5號，11號，7號，6號
最上鏡：
3號，4號
國際親善：
5號
改變
長短句
One consequence of Linux's dynamic network device naming
I knew that Linux did dynamic network device naming , but one consequence of that only really sunkin recently. Dynamic naming is relatively predictable for interfacesthat are always on (especially when various distributions work hard to make them verypersistent), but where it can really surprise you (and your software)is when the interfaces are dynamic. Like, say, PPP interfaces.
Just like Ethernet interfaces, the first active PPP connection gets ppp0 , the second one gets ppp1 , and so on. But unlike Ethernets
The advantage of blog comments
The advantage of having blog comments is that they are the easiest wayfor people to, well, make a comment on an entry. The main alternativeis email, but blog comments are significantly easier than email in this modern age of spam and other problems, where notonly is it difficult to find the blog author's email address (because ifit was easy to find the spammers would find it), but it's difficult toknow if you can trust them with your email address.
(While writing