linux performance tuning books

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 ker

is the memory occupied by the old generation growing? A: Because the memory of the young generation cannot be recycled, it is increasingly copied to the old generation. Iii. Performance Tuning In addition to the above Memory leakage, we also found that the CPU is less than 3% for a long time, and the system throughput is not enough, which is a serious waste of resources for 8 core x 16g, 64 bit

Recommend some good computer books.# PHPPHP programming (2nd edition)--php Grammar and Getting started with the best books"PHP5 authoritative programming"--php after the introduction of the upgrade book"In-depth PHP: Object oriented, Patterns and Practices" (3rd edition)--understanding object-oriented and design patterns in PHP"High Performance PHP Application De

The DB2 tutorial you are looking at is: IBM DB2 basic Performance tuning. Buffer pool If you have experience using DB2 UDB, you should know that the buffer pool is a space in memory that is allocated separately to the DB2 database manager, allowing it to add new data to the database or to respond to a query that returns a buffer from the disk to some data data pages.Because accessing data from memory is bo

Article Source: http://hi.baidu.com/top2top/blog/item/0bea951600a16050f2de322b.html apache2.0 prefork and worker module Performance Tuning The performance improvement of Apache 2.0 is the most attractive. On UNIX systems that support POSIX Threads, Apache can use different MPM to run in a mix of multi-process and multi-thread modes to enhance the scalabi

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Query performance tuning is a big topic, where the technology involved is very broad, but we can generally divide it into the following levels: 1. Reduce data access. The related technique is to create an appropriate index that converts time-consuming operations such as full table scans, index scans (scan), to index lookups (seek). Establish the correct index, can make the database query

large, you may need to add-j-xmx512m This parameter specifies the maximum heap memory, which is jhat-j-xmx512m-port9998/tmp/dump.dat. Then you can enter the host address in the browser: 9998 viewed:4. Jstat (JVM Statistical monitoring tool)Jstat [generaloption | outputoptions vmid[interval[s|ms] [count]]Vmid is the Java Virtual machine ID, which is generally the process ID on the Linux/unix system. Interval is the sampling time interval. Count is the

for a while, so we went on the Performance Tuning journey of the Erlang network connection ~~ The process is really exciting. We soon passed the 1024 mark ~~ We were very excited when we reached 4999 connections. But why are there 4999 connections? Check the code and find that echo_server.erl defines a macro with the maximum number of connections being 5000 ~~After the compilation is modified, the number o

operations, although PHP file operation efficiency is not low;41, optimize the Select SQL statement, as far as possible, as little as possible to insert, update operation (on the update, I was a bad batch);42, as far as possible the use of PHP internal functions (but I have to find a php non-existent function, wasted can write a custom function of time, experience problem ah!);PS: Built-in functions are nearly an order of magnitude more efficient than user-defined functions.43, the loop inside

. rbd cache max dirty object: The maximum Object number of objects, by default, is 0, which is rbd cache size calculated by librbd default, the disk image is logically sliced in 4MB, each chunk object is abstracted as one, and Object librbd the cache is Object managed in units. Increasing this value can improve performance. Reviews: This value is smaller in ceph-0.94.1 and is recommended to be increased by the calculation

Detailed configuration: port= "protocol=" "http/1.1"connectiontimeout= "20000"redirectport= "8443"/> 1, Tomcat's external tuningJava Virtual Machine (JVM) performance optimization allows you to set the size of the virtual machine using memory,-xmsThe size of these two values is generally set as needed. The size of the initialization heap performs the size of the memory that the virtual machine requests to the system at startup. Generally speaking, th

One, summing up the study of the day before From the "Third Day" performance Test section, we learned several important metrics for the deterministic test: • throughput Üresponsetime Ücpuload Ümemoryusage We have also done a certain optimization on the third day of study in Apache, to optimize the above 4 key readings, then our Apache tuning, our tomcat also make some corresponding adjustments, when t

Label:MySQL performance checking and tuning methodPublished: October 4, 2009 published by: OurmysqlSource: Sudone.com was read: 3,524 times only 1 ReviewsI have been using MySQL this database software, it works relatively stable, high efficiency. In the face of severe performance problems, there are generally several possibilities: 1, the index is no