readynas 4200

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Do dedup first or do compression first?

efficiency (CPU, time), its test shows that the compression efficiency is usually the first advantage, only if the data is very high dedup rate and there is almost no compressibility of the first dedup some advantages . --so more workload such as database and so on or obediently obey my method, first compress one.Cf–compress FirstHf–hashing Firstc –cost of compression per unith –cost of hashing per unitX is put as a units, sha256 for H, LZ4 for C. The number is time to process those units. The

Java Regular Expression matching parsing time

(); // System. out. println (src); // SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd/hh"); // Date date = sdf. parse (src); // System. out. println (date); // long t = date. getTime () + 4200*1000; // System. out. println (t); //} Pattern pattern = Pattern. compile ("\ d {4}-[0-1] \ d-[0-3] \ d/[0-2] \ d "); matcher = pattern. matcher (path); Date datefile = null; if (matcher. find () {String src = matcher. group (); System. out. println (s

Ember.js Getting Started Guide--handlebars basics

Command :Ember New Chapter2_tempalteEnter the project directory and start the server:CD Chapter2_templateEmber Serverrun the project, the browser opens this link:http://localhost:4200/If you can see the following message stating that the installation was successful.If the project is created successfully you can continue to look down, if the creation is unsuccessful please try again, because the following code is based on this project to demonstrate!!

How Python uses supervisor to manage processes

follows: ? 1 2 3 4 5 6 7 8 9 10 11 root@ubuntu:/home/zoer# cat daemon.py #!/usr/bin/env python import time import os while True:time.sleep (1) f=open ("Log", ' A ') T=time.time () f.write (str (t)) F.write ("n") F.close () The ID of this process can be found through PS: ? 1 2 3 Root 9354 0.2 0.4 10924 4200? S 23:16 0:00 python/home/zoer/daemon.py root 9395 0.0 0.0 4392 832 PTS/3 s+ 23:17 0:00 grep--color=

Troubleshoot mobile hard disk problems

mainstream chipset almost only NFORCE2, the legend of the new BIOS and USB drive improved NFORCE2 USB compatibility, But practice has shown that improvements are limited. The only way to completely solve this problem is to buy a PCI USB2.0 card, others see 6. 6. How to solve the problem of insufficient power supply? (Power shortage is a big reason for 5) (1) Buy a better USB removable hard disk box. (2) Purchase 4200 turn notebook hard disk to do th

Core i5 and i7: Which processor is better for you?

processor with high frequency is likely to be stronger. In addition, Intel for the Core i5 and i7 equipped with the "core frequency" feature, you can turn some of the idle cores into the main clock to improve performance, and considering the general application only use single or dual core execution, so the purchase point is to balance the main speed, core and Rui frequency. Cache The main difference is that the two-level cache of the i7 processor is typically 2MB larger than the i5. Larger

Oracle+python query Oracle for related help documents

. It is used to output PYTHON data structures in clear, readable form. >>> from Pprint import pprint>>> cursor.execute (' SELECT feed_id, Feed_url, Xmltype.getclobval (feed_xml) from Rss_feeds ')>>> cursor.execute (' SELECT * from Jobs ')[>>> Pprint (Cursor.fetchall ())[(' Ad_pres ', ' President ', 20000, 40000),(' AD_VP ', ' administration Vice President ', 15000, 30000),(' Ad_asst ', ' administration Assistant ', 3000, 6000),(' Fi_mgr ', ' Finance Manager ', 8200, 16000),(' Fi_account ', ' Acc

How to compile and package snap (1) for our snappy Ubuntu app

packaging," we can also individually manipulate different stages of it through Snapcraft: 4) Deploy our application to KVM In the previous step, we have produced our snap files and we can deploy them to our KVM by the following methods. First, start our KVM: $ kvm-m 512-redir:8090::8081-redir:8022::22-redir:4200::4200 Please note that the port number used in our main.go is 8081. We also redir

Oracle RAC Database Connection Configuration

overhead on the client; none: Default value, can also be specified to disable the failover feature2. FCF (Fast Connect Failover)ORACLE11G provides a FCF way to connect to the database, which supports JDBC thin and JDBC OCI drivers, and provides higher connection performance and high availability in conjunction with the connection cache (implicit connection cache), and can be set in app code without additional configurationRequired conditions: With the implicit connection cache enabled, FCF need

Go Oracle DB Management data concurrency processing

deleted. If all rows do not meet the Where condition, then anywhat line. Note that no rows are deleted, and this does not indicate an error; The returned message indicates only the0 rows were deleted. MERGE command Use the merge command to perform both insert andUPDATE operation. MERGE into Jobs JUSING (SELECT * from Jobs_acquisition) aOn (j.job_id=a.job_id)When matched then UPDATE SET j.job_title=a.job_titleWhen isn't matched then INSERT(j.job_id,j.job_title,j.min_salary,j.max_sa

Python uses the Supervisor to manage processes

/env python import time import os while True: time.sleep(1) f=open("log",'a') t=time.time() f.write(str(t)) f.write("\n") f.close() You can find the id of the process through ps: root 9354 0.2 0.4 10924 4200 ? S 23:16 0:00 python /home/zoer/daemon.py root 9395 0.0 0.0 4392 832 pts/3 S+ 23:17 0:00 grep --color=auto daemon root@ubuntu:/home/zoer# Take a look at the following operations: root@ubuntu:/home/zoer# rm log;touch

8 cloud-based Integrated Development rings and cloud-based development rings worth a try

be written. It is still developing, and we hope to see more new features in the next year. In addition to integrating Firebug, its biggest selling point is its Eclipse-style user interface and intuitive layout. Who can give a correct analysis of thinkpad t420 t420s which is worth starting with exclusive display? Differences from integration 1. Compared with T420, T420S has the advantage of USB 3.0 interface and lighter quality and size,In addition, there is a high resolution of 1600X900.The di

Explore some methods to optimize Ruby on Rails performance, rubyrails

tag. No wonder it is three times faster. 2.2.2 data set Any code in the data set that I am talking about is used to summarize or analyze the data. These operations can be simply summarized, or more complex. Take group ranking as an example. Suppose we have an employee, department, and salary dataset. We want to calculate the employee's salary ranking in a department. SELECT * FROM empsalary; depname | empno | salary-----------+-------+------- develop | 6 | 6000 develop | 7 | 4500 develop |

What about the Red Hat RHCE test?

general, if you are engaged in linux system management and related development work, RHCE is a very good certification certificate, and in some respects it is also a symbol of strength and professional quality.[Understand the RHCE examination]Here I will take you through the RHCE examination process and some things you need to know:First, the official cost of the RHCE test is 4200 RMB, including the RHCSA (Red Hat system administrator) test. If you h

Prerender.io search engine optimization deployed to Windows services to enable automatic start-up service

Prerender.io deployment steps for a service-side deployment Reference website:$ git clone https://github.com/prerender/prerender.git $ cd PreRender $ CNPM Install $ node server.jsIn the browser input http://localhost:3000/http://localhost:4200 if you can render your angular project correctly and see that the source code is rendered HTML, the deployment is successful. Second, the Prerender.io service creates the window service, rea

Usleep do not quit the discovery that has been sleeping

:171956,166904:5052:3600:-1452,percent=-40%select:176039,171964:4075:3700:-375,percent=-10%usleep:181117,176046:5071:3700:-1371,percent=-37%select:185191,181124:4067:3800:-267,percent=-7%usleep:190281,185199:5082:3800:-1282,percent=-33%select:194356,190288:4068:3900:-168,percent=-4%usleep:199434,194363:5071:3900:-1171,percent=-30%select:203505,199441:4064:4000:-64,percent=-1%usleep:208602,203512:5090:4000:-1090,percent=-27%select:213697,208609:5088:4100:-988,percent=-24%usleep:218775,213704:5071

How to perform rounded up to 500 increments-php Tutorial

How to perform an ascending integer with a 500 increment condition: Progressive to 500, Rule: If the current value is 4200, it will be automatically converted to 4500; if the current value is 4700, it will be changed to 5000; if the value is 4500 or 5000, it will not change. Reply to discussion (solution) $ D = array (4200,470 0, 5000,450 0); foreach ($ d as $ v) {printf ("% d: % d \ n", $ v, ceil ($ v/500) * 500 );}

Cadence PCB Drawing Steps

1 Creating a PCB file---New2 Create a Board box add-on line, choose the option selection, the frame is long 4400mil width 32003 to the PCB frame chamfer (can not do): manufacture, drafting, Fillet (round), in the Options option, the chamfer radius is set to 100milMethod: Which corner to pour, the right mouse click on the corner of the two sides, four corners are poured, the right mouse button and done4 Add the allowable wiring area (usually 100mil smaller than the board frame): Setup, areas, Rou

Array comparison and corresponding relationship are obtained. how can this problem be solved?

', 'lotno' => '4210', ), 6 => array ( 'packageno' => 'SYS140801090', 'type' => 'ECS1-713', 'cust_no' => '12657727', 'lotno' => '4200', ), 7 => array ( 'packageno' => 'SYS140801090', 'type' => 'ECS1-713', 'cust_no' => '12657727', 'lotno' => '4210', ),); There is a correspondence relationship, such as packageno S2Y140805025 corresponding to lotno 4212,4214 (type is ECS0-235, cust_no is 12654172) Also known array B:

[Soft test] detailed explanation and Application of net present value NPV, instance explanation and collection (Information System Project Manager-Project Management)

, 231000 B, 200000 C, 220000 D, 210000 Answer and analysis: economic feasibility is a measure of the cost-effectiveness of a project or solution. There are three common technologies available for evaluating economic feasibility, also known as cost-effectiveness: Investment Recovery analysis, ROI and net present value. The formula for calculating the present value is fn = P (1 + r) n, that is, 139000/(1 + 10%) 2. Instance 2Assume that the investment for the first year is 10,000, and the income f

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