nodetime 是个好玩意儿 - 未名空间MITBBS历史存档

国际科技财经博客移民网络热点娱乐民生时事公众号

Redian新闻

>未名空间

>Programming - 葵花宝典

nodetime 是个好玩意儿

nodetime 是个好玩意儿# Programming - 葵花宝典

t*82015-01-13 08:01

1 楼

化学/高分子/材料求推荐审稿机会
才完成PhD,准备开始申请绿卡,在这里向各位大牛求审稿机会
涉及的领域主要有polymer/macromoleculear chemistry, self-assembly, drug
delivery, organic electronic materials, hybrid materials, block copolymer,
stimuli-responsive polymer, micelles and hydrogels等
email:[email protected]
如需要更多信息（比如CV或者publication list）请email我，多谢多谢

w*92015-01-13 08:01

2 楼

please say say

D*l2015-01-13 08:01

3 楼

【以下文字转载自 WmGame 讨论区】
发信人: Derickdrl (♤♠♢♣), 信区: WmGame
标题: 飞机+春游
发信站: BBS 未名空间站 (Mon Apr 28 15:01:19 2014, 美东)
飞机

d*n2015-01-13 08:01

4 楼

没功夫学会v8-profiler, 就给我搞定了一个困扰我2周的问题。
推荐

D*l2015-01-13 08:01

5 楼

春游
远看毫无生气，
近看已露尖叶。

b*e2015-01-13 08:01

6 楼

啥问题，具体说说。

l*a2015-01-13 08:01

7 楼

你自己会开灰机？

W*o2015-01-13 08:01

8 楼

这话说的没头没脑，让人匪夷所思，能否说说怎么个爽法儿？

【在 d****n 的大作中提到】

: 没功夫学会v8-profiler, 就给我搞定了一个困扰我2周的问题。
: 推荐

D*l2015-01-13 08:01

9 楼

不会，感觉易学难精

d*n2015-01-13 08:01

10 楼

cpu profiler - give you stack analysis and more important, look at its "hot
spots" zone, it most likely points to the trouble.
memory profiler - for memory leaks finding, no special than google chrome
dev tools.
transaction profiler - I like one of its core chart : average http response
time,
which helped me find a non-asynchronous function blocking IO.
and very convenient to use - click to take cpu, memory, transaction snapshot
, comparing across them.
it is not super-duper, just one tool is helpful for beginners.

【在 W***o 的大作中提到】

: 这话说的没头没脑，让人匪夷所思，能否说说怎么个爽法儿？

b*e2015-01-13 08:01

11 楼

这个stack analysis有没有跨event loop，还是局限于严格意义上的runtime stack。
如果是后者的话意义不大。

hot
response
snapshot

【在 d****n 的大作中提到】

: cpu profiler - give you stack analysis and more important, look at its "hot
: spots" zone, it most likely points to the trouble.
: memory profiler - for memory leaks finding, no special than google chrome
: dev tools.
: transaction profiler - I like one of its core chart : average http response
: time,
: which helped me find a non-asynchronous function blocking IO.
: and very convenient to use - click to take cpu, memory, transaction snapshot
: , comparing across them.
: it is not super-duper, just one tool is helpful for beginners.

d*n2015-01-13 08:01

12 楼

Chrome profiler has similar feature, but I want to point out that usability
of nodetime.com is better(at least for me.)

d*n2015-01-13 08:01

13 楼

不是很明白，我是菜鸟才用这个。
大牛请给看看这个截图，是不是跨event loop。
它的cpu 百分比 call tree 似乎包括了说有的 event stack?
官方文档
V8 engine, on which Node.js is built, has a built-in sampling CPU profiler.
It records where the instruction pointer was every millisecond and creates a
call tree based on this. Although not exact, but the information is
statistically sufficient to identify which functions spent the most time in
CPU.
http://blog.nodetime.com/2012/05/cpu-profiling-with-nodetime.ht

【在 b***e 的大作中提到】

: 这个stack analysis有没有跨event loop，还是局限于严格意义上的runtime stack。
: 如果是后者的话意义不大。
:
: hot
: response
: snapshot

d*n2015-01-13 08:01

14 楼

sampling every one millisecond, 应该是cross event loop?