cassandra performance tuning

Lao Li share: Performance tuning operating system-level load analysisThe load is broadly divided into two categoriesA.CPU loadB.I/O loadIf an application needs to perform large-scale computations, although the program and disk do not have data I/O, it can take a long time to complete processing, mainly because the program relies on CPU computing, which creates the load pressure on the cup, which is called a

Performance Tuning Experience SummaryThe problem arises:In the daily environment, a server, for example, the machine's number of visits per second is around 368, the maximum number of visits at 913. The performance of the external service is that every two or three hours there is a second level of time client request timeout, in the case of increased traffic, the

compressing and extending the heap space:-xx:minheapfreeratio: Sets the minimum idle scale for heap space. The default is 40. When the free memory in the heap space is less than this value, the JVM expands the heap space.-xx:maxheapfreeratio: Sets the maximum idle scale for heap space. The default is 70. When the free memory in the heap space is greater than this value, the heap space is compressed and a smaller heap is obtained.When-xms and-xmx are equal, both parameters of-xx:minheapfreeratio

Performance Tuning for Nginx1 Modify the core number of CPUs corresponding to the Nginx work process this is generally your CPU core number of twice times, founder is multiples, specific to several times to see the specific hardware configuration2 Modifying the file descriptor 65536 ulimit-n Permanent effect can be changed/etc/sysctl.conf3 Modifying the Linux kernel scheduling algorithm Epoll4 Modifying the

First, the main method of neural network performance tuning the technique of data augmented image preprocessing network initialization training The selection of activation function different regularization methods from the perspective of data integration of multiple depth networks 1. Data augmentation The generalization ability of the model can be improved by increasing the amount of data without changing t

Hard Canton: "iOS Performance Tuning Series" The third, continuously updated, welcome attention.iOS Performance Tuning series: Analyze static analysis describes how to find iOS memory leaks using the static analysis method, iOS Performance

Hard Canton: "iOS Performance Tuning Series" fourth, is expected to be more than 20, continuously updated, welcome attention.Top two iOS Performance Tuning series: Analyze static Analysis, iOS Performance Tuning series: using inst

analyze and think twice before designing a ccbpm model for any business scenario integration. the correct usage of ccbpm is well known ented at http://help.sap.com. model Design palys a very important role on the performance of the business scenario in the Integration Server. A bad ccbpm design can have various perfromance issues in various runtime components (ie, AE, BPE ). note that every message entering the BPE is duplicated and every message lea

IOS Performance Tuning series: use Allocation to dynamically Analyze memory usage and optimize allocation Hardware wide: article 3 of the IOS Performance Tuning series, which is continuously updated. IOS Performance Tuning series:

Recently, due to Project Memory leakage, large-scale JVM performance tuning has been performed. , Now we will record the experience. I. JVM Memory Model and garbage collection Algorithm 1. According to the Java Virtual Machine specification, JVM divides the memory: New (young generation) Tenured (elder generation) Permanent generation (Perm) Among them, new and tenured are heap memory. The heap memory

monitor local and remote Java processes, including monitoring memory, threading, method execution time, and more.3-1 monitoring local Java processes3-2 monitoring the remote Java process4th chapter monitoring and debugging based on BtraceThis chapter takes you to learn how to install Btrace, how to write btrace scripts to monitor and debug the code in a production environment, such as obtaining parameters, return values, exceptions, line numbers, and so on for a method in a production environme

Go language Development (eight), go Language program testing and performance tuning Introduction of the Go Language Automation testing Framework 1. Introduction to Automated testing framework The testing of the Go Language standard package provides a framework for unit testing (functional testing) and a common approach to performance testing (stress testing) that

A collection of Java performance tuning tipsBrother LianResources available for program utilization ( memory,CPU time, network bandwidth, etc. ) is limited, the goal of optimization is to allow the program to complete the scheduled tasks with as few resources as possible. Optimization usually consists of two parts: reducing the volume of the Code and improving the efficiency of the Code. The main discussion

In the project, we are busy with the implementation of the function, the overall performance of the app is poor. Every page load is stuck. The summer vacation is coming soon, and the project team has specially arranged a version to improve the performance. The version hasn't started yet, and I'm here to record some of the performance

22 criteria for performance tuning of large-scale and high-traffic Internet sites (zz)Reprint from http://icyriver.net /? P = 26. The author should be yahoo China's engineer. Among the six newly added rules, the flush head method is quite interesting. yahoo changed its own yapache, so it is better to do these things, several other rules I think are also summarized by the research efforts of this jj team. ya

Redis Foundation, advanced features and performance tuning Kelgon attention 2017.02.28 16:22 words 12597 read 16333 comments 5 like 154 appreciate 2 This paper will start from the basic characteristics of redis, through the description of the REDIS data structure and the main command of the Redis basic capabilities of the intuitive introduction. After that, the advanced capabilities provided by Redis are d

. Create_snapshot; We can also use the Dbms_workload_repository package to complete the baseline, the default settings and other operations.ADDM (Automatic Database diagnostic Monitor AWR)Oracle is an internal consulting system, can automatically complete the most database of some optimization recommendations, giveSQLThe optimization, the creation of the index, the collection of statistics and other suggestions.ADDM report Generation:Sqlplus>@?/rdbms/addmrpt.sqlThe most important part of Oracle

of disk sorting will be greatly increased. This is mainly because at the end of the month, users will make statistics on the transaction data for the month. So at the beginning of the month, because of the number of transactions, so there will be more disk sorting occurs. In this case, it is necessary for the database administrator to adjust the relevant parameters. However, this adjustment is a temporary adjustment, until the cycle has passed, still need to transfer the parameters back. Only i

SQLSever Performance Tuning (All) dbccopentran how to view disk IO operation information the SETSTATISTICSIOON command is used to display SQLServer information about the disk activity volume generated by the Transact-SQL statement. Me SQL Sever Performance Tuning checkpoint dbcc dropcleanbuffers dbcc freeproccache dbcc