Table of Contents need: analyze: Some code implementation: 1. Operations implemented using only flag bits: 2. For greater security, the mutex lock code is added: 3. Use it with unique_lock to make the code safer Four: Use guard lock lock_guard to work with it 5. You can also use condition variables to process, which will […]
Tag: ups
Resource Groups And Selector of Presto Resource Management
Article directory Preface Resource group configuration Selector Rules Selector Rules Global Configuration Global Properties selector properties Configuration case Configuration prestoDb Foreword Resource groups limit resource usage and can enforce queuing policies on queries that run within them, or allocate resources to subgroups. The query belongs to a single resource group and consumes resources from that […]
Powercli batch modification of distributed switch port groups
Background Requirements: Modify distributed port groups of virtual machines in batches Solution 1: Three commands to solve: first obtain the target virtual machine, obtain the target port group, modify the virtual machine port group, and check the virtual machine status. $vm = Get-VM -Name <virtual machine name> $portGroup = Get-VirtualPortGroup -Name <port group name> Get-NetworkAdapter […]
Analysis of iptables security groups on computing nodes
Analysis of iptables security groups on computing nodes I have introduced the implementation of neutron security group based on iptables and ct before. Let’s analyze the iptables of neutron security group on the computing node to deepen our understanding of iptables and the implementation of security group. (PS: The following is based on openstack stein) […]
fetch_20newsgroups data set combined with word2vec algorithm
Table of Contents fetch_20newsgroups data set combined with word2vec algorithm 1. fetch_20newsgroups data set 2. Text preprocessing 3. Train word2vec model 4. Use word vectors fetch_20newsgroups data set combined with word2vec algorithm In the field of natural language processing, word vector representation is one of the commonly used techniques. The word2vec algorithm is a classic […]
FreeRTOS source code understanding (9) – event groups and task notifications
FreeRTOS source code understanding (1) – FreeRTOS ideas sorting out FreeRTOS source code understanding (2) – interrupts and list items FreeRTOS source code understanding (3) – task FreeRTOS source code understanding (4) – task scheduler FreeRTOS source code understanding (5) – task switching FreeRTOS source code understanding (6) – time management FreeRTOS source code understanding […]
DB2HADR one master and multiple backups environment setup centos7 builds db2 hadr one master and multiple backups
DB2HADR one master and multiple backups environment setup Centos7 builds db2 hadr one master and multiple backups Operating system linux centos7 DB2 version 11.1 Main library 192.168.46.72 db2_cluster_node1 orange Primary and secondary databases 192.168.46.73 db2_cluster_node2 banana From standby database 192.168.46.74 db2_cluster_node3 peach Regarding how to install db2, please refer to my previous article centos7 installation […]
[Android] How to apply for positioning | storage | dynamic permissions for sports and health + the problem of applying for permissions without pop-ups
Directory 1 How to apply for permission related codes 2 Demos for applying for permissions (including positioning, storage, satellite, sports and health) 3 Some reasons why there is no pop-up window when applying for permission 1 Related codes on how to apply for permission Take Targeting permissions as an example Add a user permission statement […]
Solve the problem that in MyBatis one-to-many query, there is only one element in each group, and the total number of groups is equal to the total number of elements.
Article directory Brief description of the problem scene description Problem Description problem causes Solution Brief description of the problem The author encountered a strange problem when using MyBatis for one-to-many query. Regarding the author’s one-to-many query results, a phenomenon occurred: It turns out that there are multiple elements in each group, and the query target […]
Linux users and user groups, file permissions, file system hierarchy
Many Linux beginners are confused by the following questions: * Why do I change settings and install software, but I am constantly asked to enter my password? * Why do some commands require `sudo` and some do not? * Why can’t I run programs downloaded from the Internet? Why can’t I see some directories in […]