j********2
发帖数: 82 | 1 1. You are given the source to a application which is crashing when run.
After running it 10 times in a debugger, you find it never crashes in the
same place. The application is single threaded, and uses only the C standard
library. What programming errors could be causing this crash? How would you
test each one?
有人说
* time related events
* un-intialized memory, or array index overflow? or invalid pointer.
However, I can see those will lead to random crashes (i.e., sometimes it
crashes), but how can they lead to crashes at random places?
2. How to add a counter to www.google.com to track the billionth user.
望指教 | g*****e
发帖数: 282 | 2 Q1. 每次得到的mem的addr可以不一样。还可以是访问register或者其他硬件相关信息
，不只timer
Q2. 这个写过web app应该都知道，在server side不能存太多东西，server会崩溃的；
简单地存basic user info。主要实在你的browser的cookie上存东西，track visiting
history等。实际上不管是google还是bing都会上传一些user behavior data，但都是
匿名的，否则法律麻烦大了
standard
you
【在 j********2 的大作中提到】
: 1. You are given the source to a application which is crashing when run.
: After running it 10 times in a debugger, you find it never crashes in the
: same place. The application is single threaded, and uses only the C standard
: library. What programming errors could be causing this crash? How would you
: test each one?
: 有人说
: * time related events
: * un-intialized memory, or array index overflow? or invalid pointer.
: However, I can see those will lead to random crashes (i.e., sometimes it
: crashes), but how can they lead to crashes at random places?
| c********t
发帖数: 5706 | 3 ding
standard
you
【在 j********2 的大作中提到】
: 1. You are given the source to a application which is crashing when run.
: After running it 10 times in a debugger, you find it never crashes in the
: same place. The application is single threaded, and uses only the C standard
: library. What programming errors could be causing this crash? How would you
: test each one?
: 有人说
: * time related events
: * un-intialized memory, or array index overflow? or invalid pointer.
: However, I can see those will lead to random crashes (i.e., sometimes it
: crashes), but how can they lead to crashes at random places?
| H****s
发帖数: 247 | 4 也许有多个 uninitialized variable 造成的random failure.
standard
you
【在 j********2 的大作中提到】
: 1. You are given the source to a application which is crashing when run.
: After running it 10 times in a debugger, you find it never crashes in the
: same place. The application is single threaded, and uses only the C standard
: library. What programming errors could be causing this crash? How would you
: test each one?
: 有人说
: * time related events
: * un-intialized memory, or array index overflow? or invalid pointer.
: However, I can see those will lead to random crashes (i.e., sometimes it
: crashes), but how can they lead to crashes at random places?
| g**e
发帖数: 6127 | 5 1. compiling arguments
2. 跟getUniqueID类似，每个新用户获取一个unique ID。n台机器每个step 1..n，第
1B个用户一定在 1b % n那台机器上
standard
you
【在 j********2 的大作中提到】
: 1. You are given the source to a application which is crashing when run.
: After running it 10 times in a debugger, you find it never crashes in the
: same place. The application is single threaded, and uses only the C standard
: library. What programming errors could be causing this crash? How would you
: test each one?
: 有人说
: * time related events
: * un-intialized memory, or array index overflow? or invalid pointer.
: However, I can see those will lead to random crashes (i.e., sometimes it
: crashes), but how can they lead to crashes at random places?
| h**k
发帖数: 3368 | 6 2.没有考虑多个用户共享一台机器或者一个用户用多台机器访问
首先要和面试官确定怎么定义用户，这个用户是指unique user还是包括returning
user
个人感觉这道题在问你多个服务器如何同时写一个变量，如果用lock的话，速度太慢。
【在 g**e 的大作中提到】
: 1. compiling arguments
: 2. 跟getUniqueID类似，每个新用户获取一个unique ID。n台机器每个step 1..n，第
: 1B个用户一定在 1b % n那台机器上
:
: standard
: you
| s********k
发帖数: 6180 | 7 最简单的程序中引入了random variable，比如timer，比如backoff？或者memory地址
？ |
|
