摘要：本文测试时间时2020.12.06 测试的mysql版本是community版本8.0.22 首先指出一个select ...for update的一个大家很容易产生的错误理解："for update可以锁存在的和不存在的记录，同一个索引字段的同样的值一定会block住。" 这句话对也不对。对是指它 阅读全文

摘要：First confirm that you have root privilege. Second check the config of kernel that you have the configs on: Last you confirm you have your debugfs/tra 阅读全文

摘要：mutex( x lock): when a mutex lock is obtained, others cannot obtain the same mutex while the lock is not freed. shared lock( s lock): when a shared lo 阅读全文

摘要：Before using stap, the kernel-debuginfo-$(uname -r), kernel-debuginfo-common-$(uname -m)-$(uname -r) and kernel-devel-$(uname -r) should be installed. 阅读全文

摘要：Before preceding, several things need to be checked: There are too many tutorials on how to build with ct-ng, I only list several useful steps for fut 阅读全文

摘要：ioctl is used in communication with modules of Linux. Module: User space In case of Makefile is needed: 阅读全文

摘要：some frequently used AC macros: AC_INIT :must AC_OUTPUT :must AC_PREREQ :determine ac version so that needed features are included AC_CONFIG_SRCDIR :d 阅读全文

摘要：From wiki quote: The Time Stamp Counter (TSC) is a 64-bit register present on all x86 processors since the Pentium. It counts the number of cycles sin 阅读全文

摘要：Sometimes we build a program as release and when debugging, some variables cannot be printed out, and displayed as optimized out. That is because the 阅读全文

摘要：SNMP is a protocol that enables server remote-info-exchange. Which according to wikipedia: it [collecting and organizing information about managed dev 阅读全文

摘要：Maven, is actually a java project manager.. Installing maven in windows need to set system environment vars like JAVA_HOME and PATH.. And it is rather 阅读全文

摘要：Install docker from official site, in windows. or install docker from repo as official site told, in linux.. after installation, we run by: (windows s 阅读全文

摘要：Sometimes running program in Unix will fail without any debugging info or warnings because of the laziness of programmer.. So if need to find the righ 阅读全文

摘要：yum install -y epel-release glibc.i686 libtools vim clang git autoconf automake w3m glibc screen the most import sentence I learned in meeting compili 阅读全文