spt tuning

I. Tuning needs to focus on several aspects Memory tuning Tuning CPU Usage Lock Competition Tuning I/O tuning Two. Twitter's biggest enemy: latencyWhat are some of the causes of the delay? The biggest impact factor is the GC Others are:

priorities, users can adjust without authorization.10. Reasonable control of the start time of the reduce taskIf the reduce task is started prematurely, it may reduce resource utilization by causing the "slot hoarding" phenomenon caused by the reduce task to occupy the reduce slot resource for long periods of time, and conversely, if the reduce task is started too late, it will cause the reduce Task gets the resource delay, increasing the run time of the job.three Task level parameters tuningTh

the job according to the importance of the job, the different important degree of the job allows the configuration of different priorities, users can adjust without authorization.10. Reasonable control of the start time of the reduce taskIf the reduce task is started prematurely, it may reduce resource utilization by causing the "slot hoarding" phenomenon caused by the reduce task to occupy the reduce slot resource for long periods of time, and conversely, if the reduce task is started too late

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 tuning schemes in different time periods. By... talking a

. For example, when an index is deleted, the execution Plan of the corresponding SQL Plan baseline is deleted, this will not help avoid performance degradation. I personally think this is a comprehensive choice of Oracle, and it is not a limitation of SQL Plan Management. The SQL Tuning function of the Oracle database can generate an SQL profile to help the optimizer generate a well-adjusted plan. However, this mechanism is passive and does not guaran

I started to write this post before weeks ago and finally publish it even if it's not totally finish. it is just a little feedback about tuning a full lamp server with some user traffic and services load. important thing to notice is that all stuff in this post isNot the solution. You will probably have to tune little more for adapt all this to your personal server usage, server load, development architecture. so, use those tips as a kind of inspirat

JVM tuning (the most critical parameters are:-xms-xmx-xmn-xx:survivorratio-xx:maxtenuringthreshold)Generation Size tuning:Avoid the Cenozoic size setting too small, avoid the Cenozoic size settings too large, avoid survivor set too small or too large, reasonable set up the new generation survival cycle.-xmn Adjust the Cenozoic size, the larger the new generation usually means that more objects will be recycled in the minor GC phase, but it may be poss

In use. NET to start and develop the application quickly, the next problem may be the performance tuning aspects of the program, and performance tuning can sometimes involve all aspects of the problem, such as the program host system, database, network environment, and so on, and when the program is unusually large and complex, performance tuning will become even

First, memory tuning The kernel's options for memory are in the/PROC/SYS/VM directory. 1.pdflush, used to write back the dirty data in memory to the hard disk. Can be adjusted by/proc/sys/vm/vm.dirty_background_ratio. The first view of this value should be 10 by default. [Root@esf ~]# Cat/proc/sys/vm/dirty_background_ratio 10 This value is a threshold indicating that if the dirty data in memory reaches 10% of the total memory of the system, then

Label: Objective About SQL Server Tuning series is a huge content system, not a word two words can be analyzed clearly, this article first in the SQL tuning in the most commonly used query plan to parse, to do a good job of the basic grasp, tamping basic skills! Then we talk about the overall statement tuning. Learn how to read and understand query plans, and enu

Tags: mysql performance optimization tuning-primer.shTuning-primer.sh detects the current operation of MySQL, generates reports, and gives recommendations for optimization. Download and use:1.wget http://www.day32.com/MySQL/tuning-primer.sh2. Copy the tuning-primer.sh to the my.cnf Sibling directory3.chmod +xtuning-primer.sh Execution: SH

We are going to discuss with you today that we will correctly resolve the 12 difficult questions about DB2 performance tuning. If you are curious about the 12 difficult questions about DB2 performance tuning, the following articles will unveil its secrets. The following is a detailed description of the article. I hope you can learn from it. 1. Logical design should always be fully mapped to Physical Design

the data to be monitored, use Topbeat as the resource usage measurement standard, use Filebeat as the real-time Log File Analysis, and use Packetbeat to analyze online network data. There are many optional tools, such as what you know, what you like, or what you want to learn. The most important thing you need to remember is to make sure that you know your benchmark data before you start the modification operation. Performance Tuning Tool Tuna Tuna c

changes.It is useful to analyze Java memory issues for tuning, you learn the JVM memory model, and then you find that each value here has meaning.GC Algorithms and parameters have a significant impact on performance, note the number of garbage collections, the time, and the partial GC and full GC, adjust the different GC and GC parameters you use, and then look at it under this view to get good performance.Here is a map of the generations of the gene

Original article: http://www.mastertheboss.com/jboss-performance/jboss-as-7-performance-tuning JBoss Application Server Tuning Although many architects and software engineers agree that the performance of about 70-80% of applications depends on the code of the application itself, improper configuration of the server environment can significantly affect your user experience, and ultimately affect the perform

ObjectiveAfter getting started with the JVM garbage collection mechanism, you can then learn the performance tuning. There are two main parts of the content: The use of JDK tools. Tuning strategy. Weapon Spectrum JPSList the running virtual machine processes, using the following:JPS [-option] [HostID] Options function Q Output only Lvmid, om

This article transferred from: http://www.cnblogs.com/chen77716/archive/2010/06/26/2130807.htmlRecent memory leaks due to the project, so large-scale JVM performance tuning, now the experience to do a record.First, JVM memory model and garbage collection algorithm1. According to the Java Virtual Machine specification, the JVM divides the memory into: New (Young Generation) Tenured (old generation) Permanent generation (Perm) Wher

For Linux system tuning parameters, all TCP/IP tuning parameters are located in the/proc/sys/net/directory. For example, the following are some of the most important tuning parameters, and their meanings are as follows: 1./proc/sys/net/core/rmem_max mdash; maximum TCP data receiving buffer 2,/proc/sys/net /... for Linux system

Description: This article is mainly referenced from the "Distributed Java Application: Foundation and Practice"1, the JVM tuning is mainly the memory of the tuning, the main tune two aspects: The size of each generation Garbage collector Selection 2, the size of each generation Common adjustment parameters -xmx -xms -xmn -xx:survivorratio -xx:maxtenur

were just generatedTrafficJamBigData03301009\ TrafficJamBigData03301009-train_lmdb and F:\caffe-master170309\data\TrafficJamBigData03301009\ TrafficJamBigData03301009-test_lmdb Copy to caffe-master170309/examples/TrafficJamBigData03301009 . Modify F:\caffe-master170309\examples\TrafficJamBigData03301009\synset_ Words.txt for plugging and not plugging two categories (note BuDu in the first row, du in the second row, because to the front of the label.txt corresponding)3.1.5 New FileNew in caffe