Wei Shen questions

Wei Shen answers

• Shell REGEX for date
• Is CPU access asymmetric to Network card
• how to solve the cpufreqset errors
• Clock, rdtsc and CLOCKS_PER_SEC
• How to distinguish zero from very small number in floating-form
• _mm_pause usage in gcc on Intel
• Why does using taskset to run a multi-threaded Linux program on a set of isolated cores cause all threads to run on one core?
• descriptor concept in NIC
• Is there any way to get the socket descriptor due to which select() call is returning EBADF?