University experiments and work

Off Topic:

Here I thank the teachers for their careful cultivation, thanks to the teachers who have forgotten the name of the hard education, here to offer the highest respect. Thank you for letting me have a complete knowledge system, and rigorous scholarship attitude.

Body:

University experiments may be a lot of things we do, but the basic experimental methods, we seldom seriously comprehend and understand, and then apply to the work. In the work, encounter problems, may be like headless flies casually everywhere bump, seldom quiet heart to think, why? Thank you for your big Brother's cultivation: five Why you can solve a problem quickly.

Problem-Solving ideas:

1) record detailed phenomena, and any possible environment variables, have we ever had such a detailed record?

Have we ever used tcpdump to grab a packet to analyze the negotiation process? No, we have a record of each problem solving ideas and ideas, and record the facts, experience often become a kind of inspiration, rather than practice of proof and exploration.

Example: With the kernel exception output as an example,/var/log/messages output information is scarce, unable to locate the problem.

Three Questions one step:

Kernel exception output function: PRINTK

Main path of kernel exception output:/var/log/messages

Where the kernel exception output path is set/etc/rsyslog.conf

Detailed information includes: Error exception, abnormal occurrence point, current system status, including device, storage device, character device, output, load, network performance,

2) To explore detailed execution steps, any negligence point may be the deadly straw of the crash

People are often limited in their energies and need to undergo constant testing to see the stability of the current system. In many cases, system instability is caused by improper logic handling of the service. In fact, we can consider the following:

There is too much memory fragmentation, the disk cache cannot be written, and so on.

3) record the detailed literature and information

The fruits of any mental work record the essence of technology, which can advance the civilization and progress of human history.

University experiments and work