cassandra write performance tuning

C = this; c! = null; c=c.parent) {//Protected against simultaneous call to Addappender, Removeappender,... sy Nchronized (c) {if (C.aai! = null) {write + = C.aai.appendloopappenders (event);}MemoryFrom the operating system perspective, memory focuses on whether the application process is sufficient, and you can use the Free–m command to view memory usage. With the top command, you can see the virtual memory VIRT and physical memory RES used by the pr

Nginx Performance Tuning Address: http://nginx.com/blog/tuning-nginx/ Tuning NGINX for Performance Nginx Performance Tuning NGINX is well known as a high

Address: http://nginx.com/blog/tuning-nginx/ Tuning nginx for performance Nginx Performance Tuning Nginx is well known as a high performance Load balancer, cache and web server, powering over 40% of the busiest websites in the wor

Analyze CPU usage in your applicationSource: http://www.cnblogs.com/chensheng12330/p/3947585.htmlIt is important to ensure that all available resources are used effectively to write code for your application. The most important of these is your CPU resources. Efficient use of CPUs allows applications to run faster and more efficiently. Even if you will be writing application-specific platforms, remember that even the same type can have a common platfo

read the output results to get all the information. Even the first page is enough to tell you where the remaining 10% of the Report is worth your attention. The statistical package of Oracle 9.2 contains the CPU and consumption time columns. Previously, in order to sort long-running SQL statements to the top, we had to enable "tracing", connect tracing files, and deliver them to the tkprof program for processing. This is unrealistic for large enterprises that simply "track" to process up to 10

Redis Performance Tuning: Save the effect of SNAPSHOT on performance, redissnapshot Some time ago, the Development Environment reported that access to the Redis server was very slow, and each request took several seconds. 2 ~ This will happen again in three days. I checked the Linux performance and there is no problem.

Nginx Performance Tuning Address: http://nginx.com/blog/tuning-nginx/ Tuning NGINX for Performance Nginx Performance Tuning NGINX is well known as a high

below: The total number of instances created on the left, the structure of the instance on the right, and the reference description below, which can be seen in the class Cyclicdependencies and referenced by HashMap.This can determine the location of the leak, and then according to the actual situation to analyze and solve. JVISUALVM remotely monitor Tomcat 1 and modify the remote Tomcat's catalina.sh profile, where it adds: java_opts="$JAVA _opts -djava.rmi.server.hostname=192.168.

. Performance monitoring technology can be roughly divided into two categories: the technology used when fault-related knowledge is known and the technology used to locate the fault (or find whether a fault exists. If you find some problems with this fault, you can obtain more information in this regard. Therefore, starting with 2nd technologies that help precisely locate the fault area, we will discuss how to conduct more detailed analysis. When

each downstream task, hashes the data by key and writes the key to the corresponding disk file based on the hash value of the key. Of course, writing to a disk file is also written to the memory buffer, and the buffer is filled before it overflows to the disk file. Finally, all the temporary disk files are merged into one disk file and a separate index file is created.The disk write mechanism of this process is in fact the same as the Hashshufflemana

each downstream task, hashes the data by key and writes the key to the corresponding disk file based on the hash value of the key. Of course, writing to a disk file is also written to the memory buffer, and the buffer is filled before it overflows to the disk file. Finally, all the temporary disk files are merged into one disk file and a separate index file is created.The disk write mechanism of this process is in fact the same as the Hashshufflemana

to solve the performance problems of this interpretation execution and single-threaded operation language. This article highlights some of the techniques and best practices for JavaScript performance tuning in development, as well as some of the ways in which JavaScript operates DOM nodes for performance

of the benefits of using Ramlog is that there is no need to worry about a daemon sending a message to the syslog every 30 seconds, before the hard drive must be kept running, which is bad for hard drives and batteries.19. Package first, then writeIn memory to partition a fixed size of the space to save the log file, which means that the laptop hard drive does not have to keep running, only when a daemon needs to write to the log to run, note that the

Talk about linux performance tuning 12: Red Hat optimization strategy Tuned talking about linux performance tuning 11: Memory Allocation Management http://www.2cto.com/os/201307/228761.html A dynamic tuning solution launched by RedHat allows you to use different

accesses data, how to control concurrent access (transaction isolation levels, locks, etc.), how to interact with the underlying operating system, and knowledge of multithreading, processes, and more. This "soft" approach usually has a very good effect by reducing the level of transaction isolation (to some extent sacrificing data consistency, etc.). Second, a single DB server to achieve a certain bottleneck, through the "cluster" and other means to achieve read and

This document describes how to use SQL Plan Management to manage SQL Execution plans. SQL Plan management provides components for capturing, selecting, and evolving SQL Plan information to prevent performance degradation caused by sudden changes in the execution Plan of SQL statements. See http://blog.csdn.net/davidwang9527/article/details/18620953 FOR THE FIRST PART This article includes the following topics:3. Use SQL Plan Baseline with SQL

to achieve non-blocking is better than the use of lock mode performance. There are some improvements to nonblocking algorithms: MCAS, WSTM, etc.)Use as few locks as possible: lock only on resources that need to be controlled (there is usually no need to lock the entire method, minimize the lock as much as possible, lock only the mutex and atomic operations, and locking as much as possible in the minimized granularity of the protection resources-such