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actual operation. The specific cause of the problem is not described. In addition, "GPU rendering mode analysis" displays the last 128 frames of data, but frame dropping may also result from a long operation between two frames. Therefore, we need to analyze the situation between frames to better understand the overall performance of the analyzed application. Two tools are provided in Android to achieve this purpose: 1. systrace (this tool pitfall me
this rule applies in which programming language)2, as little as possible to change the scope chain
Using the WITH
Try Catch
I learned that there are only two ways to change the scope chain in JavaScript (1) using the WITH Expression 2) by catching the exception try catch to implementBut with a performance-affecting expression that everyone hate
1. Preliminary diagnosis of site performance bottlenecks using waterfall chartsIn general, the speed at which a Web page is opened is affected by the following:1) It took too long for the server to convert the contents of the. aspx page into HTML.2). aspx pages take too long to send content from the server side to the client.3) pictures or Flash files on the page take too long to send from the server side t
CPU, and the result should be consistent.
12. Clean the battlefield
// ReleaseClreleasekernel (adder );Clreleaseprogram (Program );Clreleasememobject (CL_A );Clreleasememobject (cl_ B );Clreleasememobject (cl_res );
For (size_t I = 0; I Clreleasecommandqueue (cqueue [I]);}Clreleasecontext (context );
2. Performance Analysis
The above is a very simple Cl entry program. With this program, I later made a lo
It's like stripping. net syntax sugar tool (reflector and so on) a lot of the same, we can be used for analysis. there are many tools for net program performance, such as the performance analysis tool provided by vs introduced in the previous blog debuglzq. In addition, common tools include CLR profiler and windbg.
Vs built-in Performance AnalysisYou can quickl
About linux performance tuning 2: optimizing swap partitions 1 of linux performance tuning: Disk partitioning policy http://www.2cto.com/os/201307/226371.html First, let's talk about what is a swap partition and its role? Swap partition, that is, Swap zone. The role of swap space can be described in a simple way... about linux
speed of the interface to improve a lot.But when we need to define a set or array of constants in our code, how can we avoid the overhead of these two processes? For example, in development, we need to define a static global array. If defined in a class that is instantiated in the activity's oncreate, it will certainly consume a lot of activity startup time. How do you optimize for this problem? We can refactor this static array into another class, and we can call the static array in this class
));This typical trace statement can lead to serious performance problems, even if we turn off the program's tracking function, the amount of computation implied by this statement is absolutely negligible:1 Create a temporary string object for "x="2 Call function Itoa;3 The character pointer returned from ITOA creates a temporary object of string4 Connect the above two strings to construct the third temporar
[. Net Object-Oriented programming advanced] (15) caching (Cache) (2) Using Cache to improve program performance and javacache caching
[. Net Object-Oriented programming advanced] (15) Cache (ii) using Cache to improve program performance
This section introduces:
In the previous section, the cache technology exchanges space for time, and introduces the Client Cac
Select 1-(physical. Value-direct. Value-lobs. Value)/logical. value)
"Buffer cache hit ratio"
From v $ sysstat physical, V $ sysstat direct, V $ sysstat lobs, V $ sysstat logical
Where physical. Name = 'physical reads'
And direct. Name = 'physical reads direct'
And lobs. Name = 'physical reads direct (LOB )'
And logical. Name = 'session logical reads ';
When the preceding statement is greater than 90%, the statement is fully adjusted. The hit rate is high!
Iii. Improve database buffer cache
Document directory
Problem proposal
Problem Analysis
Solve the problem
Problem proposal
Problem Analysis
Or is the performance seriously degraded due to the big data of a table? Do we have to store multiple tables to solve the problem? In the following example, we will analyze and optimize the Data Management Performance of dedecms. Do not make mysql a scapegoat.
The test data is accidentally obta
(2) New Features of Unity5.0 ------ internal unity: memory and performance (and Unity5 upgrade and optimization), unity5In our script code, we often need to access the gameObject reference or reference a component. The best way is to cache all these potentially accessed items during the Awake script.To access an attribute of a temporary gameObject instance or a gameObject instance of a temporary component,M
The ORACLE tutorial is: Oracle SQL Performance Optimization Series 2.
4. Select the most efficient table name sequence (only valid in the rule-based Optimizer)
The ORACLE parser processes the table names in the FROM clause in the order FROM right to left. Therefore, the table written in the FROM clause (basic table driving table) will be processed first. when the FROM clause contains multiple tables, You m
In the performance testing, we often refer to a number of indicators and standards, today to share a more popular industry "2-5-10 principle."The specific statement can be attributed to the following 4:1. When the user is able to 2 when the response is received, the response of the system will be felt quickly.2. When t
>" Response.Write Data( 1, nRep ) Response.Write "</TD><TD>" Response.Write Data( 2, nRep ) Response.Write "</TD><TD>" Response.Write Data( 3, nRep ) Response.Write "</TD><TD>" Response.Write Data( 4, nRep ) Response.Write "</TD><TD>" Response.Write Data( 5, nRep ) Response.Write "</TD></TR>" Next End Function
While this code is likely to provide us with the best performance and scalability, the encapsulat
generated view) Ash generation Run the following script, for example, to generate the Ash report: @?/rdbms/admin/ashrpt.sql
1. You are all the way to the carriage. is to get the ash report for the recent 15 minutes.
2. You are based on oldest ash sample available time and then enter, choosing the longest ash execution 3 that can be collected at the moment
. You can choose oldest Ash sample available and latest Ash sample Time between available, then
. You are all the way to the return, is to get the latest 15 minutes of ash report. 2. You are based on oldest ash sample available time and then enter, choosing the longest ash execution 3 that can be collected at the moment. You can choose the time between oldest Ash sample available and latest Ash sample available, and then enter the length, for example 30 for 30 minutes, whichever time you want to take the ash reportThe ash report can also be obta
have to make the database redundant to improve the search efficiency. The following describes in detail.
2. reasonable redundancy
Everything has two sides, and the three paradigms are no exception. It is good to achieve a balance. As mentioned in the previous article, the bottleneck of system performance is relative. The principle is as follows: Who affects the perform
Where mgr = E. EMPNO)And sal> 50000And job = 'manager ';6. Avoid '*' in the SELECT clause '*'When you want to list all columns in the SELECT clause, using dynamic SQL COLUMN reference '*' is a convenient method. unfortunately, this is a very inefficient method. in fact, ORACLE converts '*' into all column names in sequence during parsing. This task is done by querying the data dictionary, which means it takes more time.7. Reduce the number of database accessesWhen each SQL statement is executed
. iamge, convertView. findViewById (R. id. iamge ));}(TextView) convertView. getTag (R. id. text). setText (listData. get (position ));Int id = position % 2 = 1? R. drawable. icon: R. drawable. default_head;(ImageView) convertView. getTag (R. id. iamge). setImageResource (id );
As you can see. The final result is similar to optimization 1.
Maybe the results are not very accurate, but at least we know how to use traceView to help us, and also know the
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