Programmer Think

fio Fio was originally written to avoid the trouble of writing special test case programs when testing a specific workload for performance reasons or finding / reproducing errors. Writing such a test application can be cumbersome, especially if you must do so often. Therefore, I need a tool that can simulate a given I / O workload without writ ...

introduction In this highly information-based IT era, the production system, business operation, sales and support, daily management and other links of enterprises increasingly rely on computer information and services, resulting in a large increase in the demand for the application of high availability technology, so as to provide conti ...

Linux learning – disk quota, VDO, virtual data optimization Disk capacity quota Soft limit: when the soft limit is reached, the user will be prompted. When the user is still allowed to continue to use within the limited limit Hard limit: when the hard limit is reached, the user will be prompted and the user's operation will be forcibly ...

This tutorial is the personal effort of bloggers. If there is any quotation, the quotation information should be indicated at the top of the article tkinter practical tutorial I installing tkinter under Linux environment tkinter sub module ttk of tkinter practical tutorial II tkinter Button control in tkinter practical tutorial III Installi ...

Operation mode Comparison and optimization of three operation modes (bio, NiO and APR) of Tomcat Connector. org.apache.coyote.http11.Http11Protocol: BIO org.apache.coyote.http11.Http11NioProtocol: NIO org.apache.coyote.http11.Http11Nio2Protocol: NIO2 org.apache.coyote.http11.Http11AprProtocol: APR BIO A thread processes a request. Disadvan ...

1, IP address and port concept 1. IP address In the network, each computer must have an IP address; 32 bits, 4 bytes, commonly expressed in dotted decimal format, for example: 192.168.1.100 127.0.0.1 is a fixed ip address, which represents the current computer and is equivalent to "this" in object-oriented 2. Port When two compute ...

In the process of mapping a linear address to a physical address by i386 CPU, if the mapping of the address has been established, but the P(present) flag in the corresponding page table or directory item is found to be zero, then the corresponding physical page is not in memory and thus the memory access cannot be completed. In theory, this sit ...

1) Experimental platform: punctual atom alpha Linux development board 2) Platform purchase address: https://item.taobao.com/item.htm?id=603672744434 2) Full set of experimental source code + manual + video download address: http://www.openedv.com/thread-300792-1-1.html 3) Students interested in punctual atomic Linux can add group discussion: 93 ...

FROM Syntax: FROM <image>:<tag> Indicates the base image from which the new image is built. If tag is not selected, the default value is latest. If it is not based on any image, it is written as: FROM scratch. Official note: scratch image is an empty image, which can be used to build busybox and other ultra-small images. It ...

1. General2. Terminology3. nfs-ganesha 3.1. Introduction3.2. Architecture 3.2.1. Overall structure diagram3.2.2. Architecture description3.2.3. Genesha Rados cluster design 3.2.3.1. Client recovery (single case)3.2.3.2. Grace period (single case)3.2.3.3. Reboot Epochs3.2.3.4. gracedb3.2.3.5. Cluster 3.3. Implementation of high a ...