Programmer Help

Catalog   1. free view memory usage   2. View / proc/meminfo file for physical memory information   3. top command gets memory usage   1. free View Memory Quantity Command   This command is a special command for viewing the amount of memory. This command has many parameters, which can display ...

SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) are security protocols that provide security and data integrity for network communication. TLS and SSL encrypt the network connection at the transport layer. The usefulness of SSL Through SSL encryption, the data interaction between website and users will be more secu ...

01 Preparatory Environment Environment: ubuntu 16.04 environment (physical or virtual) Confirm whether the CPU supports virtualization: # egrep -o '(vmx|svm)' /proc/cpuinfo # vmx If not, restart after KVM nested virtualization is turned on. 1.1 Installation of KVM Environment sudo apt-get install -y qemu-kvm ...

1. Copy the following installation packages to the server mysql-community-client-5.7.24-1.sles12.x86_64.rpm mysql-community-server-5.7.24-1.sles12.x86_64.rpm mysql-community-libs-5.7.24-1.sles12.x86_64.rpm mysql-community-common-5.7.24-1.sles12.x86_64.rpm 2. Installation of Software sudo rpm -ivh mysql-community-common-5.7.24-1.sles12.x86_64.rp ...

1. Installing libicu dependencies 1. On-line Installation sudo mkdir /usr/local/dotnet #Create directory cd /usr/local/dotnet sudo wget https://Download.visual studio.microsoft.com/download/pr/53cace8f-2907-487e-84d7-bc7a7ba5de05/326704ffa2ef9d4dcd0db2f1da996ebb/aspnetcore-runtime-2.2.1-linux-x64.tar.gz#Download offline installation package su ...

Recently, we studied the compilation method of cmake to configure Qt, and wrote CMakeLists.txt, which was compiled but failed to link successfully. Because it used mac osx, we thought that there was a problem with different system link libraries. Check the path given by him (the content of variable ${QT_LIBRARIES}) as follows: /Volumes/Desig ...

The question is, the capacity of df-h is different from that of du-sh. Is there a problem? Here are the results of du-sh* and df-h, respectively. [root@mail /]# du -sh * 6.2M bin 22M boot 172K dev 29M etc 165G home 130M lib 26M lib64 16K lost+found 4.0K media 4.0K mnt 4.0K opt du: cannot access"proc/9139/task/9 ...

This article is based on linux 3.10.40. Other versions are for reference only. In the introductory tutorial of character device driver development, the most common way is to create device nodes with device_create() function. However, device_create() is rarely seen in the process of reading the kernel source code. Instead, device_register( ...

Setting Oracle 11g MEMORY_MAX_TARGET to 0 under linux > yope(2017_08_08) Causes of the problem: Because the original business memory of the database server can not meet, so the increase of memory, CUP and hard disk, which has the following oracle Performance tuning. In plsql, the following tuning schemes are executed, and the specific parame ...

When using the Linux system function mmap(), mapping FrameBuffer to memory to implement a simple snake-eating game, when testing on its own Edhat 6.4, the result of running the program prompts, "No such device". However, under / dev / you can see that both fb0 and FB exist, and the operation permissions are sufficient. At first, I di ...