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  • How many users are sufficient to make a heavy load for web application

    - by galymzhan
    I have a web application, which has been suffering high load recent days. The application runs on single server which has 8-core Intel CPU and 4gb of RAM. Software: Drupal 5 (Apache 2, PHP5, MySQL5) running on Debian. After reaching 500 authenticated and 200 anonymous users (simultaneous), the application drastically decreases its performance up to total failure. The biggest load comes from authenticated users, who perform activities, causing insert/update/deletes on db. I think mysql is a bottleneck. Is it normal to slow down on such number of users? EDIT: I forgot to mention that I did some kind of profiling. I runned commands top, htop and they showed me that all memory was being used by MySQL! After some time MySQL starts to perform terribly slow, site goes down, and we have to restart/stop apache to reduce load. Administrators said that there was about 200 active mysql connections at that moment. The worst point is that we need to solve this ASAP, I can't do deep profiling analysis/code refactoring, so I'm considering 2 ways: my tables are MyIsam, I heard they use table-level locking which is very slow, is it right? could I change it to Innodb without worry? what if I take MySQL, and move it to dedicated machine with a lot of RAM?

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  • Link failure with either abnormal memory consumption or LNK1106 in Visual Studio 2005.

    - by Corvin
    Hello, I am trying to build a solution for windows XP in Visual Studio 2005. This solution contains 81 projects (static libs, exe's, dlls) and is being successfully used by our partners. I copied the solution bundle from their repository and tried setting it up on 3 similar machines of people in our group. I was successful on two machines and the solution failed to build on my machine. The build on my machine encountered two problems: During a simple build creation of the biggest static library (about 522Mb in debug mode) would fail with the message "13libd\ui1d.lib : fatal error LNK1106: invalid file or disk full: cannot seek to 0x20101879" Full solution rebuild creates this library, however when it comes to linking the library to main .exe file, devenv.exe spawns link.exe which consumes about 80Mb of physical memory and 250MB of virtual and spawns another link.exe, which does the same. This goes on until the system runs out of memory. On PCs of my colleagues where successful build could be performed, there is only one link.exe process which uses all the memory required for linking (about 500Mb physical). There is a plenty of hard drive space on my machine and the file system is NTFS. All three of our systems are similar - Core2Quad processors, 4Gb of RAM, Windows XP SP3. We are using Visual studio installed from the same source. I tried using a different RAM and CPU, using dedicated graphics adapter to eliminate possibility of video memory sharing influencing the build, putting solution files to different location, using different versions of VS 2005 (Professional, Standard and Team Suite), changing the amount of available virtual memory, running memtest86 and building the project from scratch (i.e. a clean bundle). I have read what MSDN says about LNK1106, none of the cases apply to me except for maybe "out of heap space", however I am not sure how I should fight this. The only idea that I have left is reinstalling the OS, however I am not sure that it would help and I am not sure that my situation wouldn't repeat itself on a different machine. Would anyone have any sort of advice for me? Thanks

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  • Is it possible to cache all the data in a SQL Server CE database using LinqToSql?

    - by DanM
    I'm using LinqToSql to query a small, simple SQL Server CE database. I've noticed that any operations involving sub-properties are disappointingly slow. For example, if I have a Customer table that is referenced by an Order table, LinqToSql will automatically create an EntitySet<Order> property. This is a nice convenience, allowing me to do things like Customer.Order.Where(o => o.ProductName = "Stopwatch"), but for some reason, SQL Server CE hangs up pretty bad when I try to do stuff like this. One of my queries, which isn't really that complicated takes 3-4 seconds to complete. I can get the speed up to acceptable, even fast, if I just grab the two tables individually and convert them to List<Customer> and List<Order>, then join then manually with my own query, but this is throwing out a lot of what makes LinqToSql so appealing. So, I'm wondering if I can somehow get the whole database into RAM and just query that way, then occasionally save it. Is this possible? How? If not, is there anything else I can do to boost the performance besides resorting to doing all the joins manually? Note: My database in its initial state is about 250K and I don't expect it to grow to more than 1-2Mb. So, loading the data into RAM certainly wouldn't be a problem from a memory point of view. Update Here are the table definitions for the example I used in my question: create table Order ( Id int identity(1, 1) primary key, ProductName ntext null ) create table Customer ( Id int identity(1, 1) primary key, OrderId int null references Order (Id) )

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  • Database tables with dynamic information

    - by Tim Fennis
    I've googled this and found that it's almost impossible to create a database with dynamic collumns. I'll explain my problem first. I am making a webshop for a customer. It has multiple computer products for sale. CPU's HDD's RAM ect. All these products have different properties, a CPU has an FSB, RAM has a CAS latency. But this is very inconvenient because my orders table needs foreign keys to different tables which is impossible. An other option is to store all the product specific information in a varchar or blob field and let PHP figure it out. The problem with this solution is that the website needs a PC builder. A step-by-step guide to building your PC. So for instance if a customer decides he wants a new "i7 920" or whatever i want to be able to sellect all motherboards for socket 1366, which is impossible because all the data is stored in one field. I know it's possible to select all motherboards form the DB and let PHP figure out which ones are for socket 1366 but i was wondering, is there a better solution?

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  • Footprint of Lua on a PPC Micro

    - by Adam Shiemke
    We're developing some code on Freescale PPC micros (5517 and 5668 at the moment), and I was wondering if we could put Lua on them. The devices need to be easily programmed/reconfigured in the field, and the current product uses a proprietary interpreted logic language that can be loaded in, and our software (written in C) runs an interpreter. I would like to move to a better language (the implementation is a bit buggy and slow), so I'm considering Lua, but the memory footprint must be very low. For the 5517 (which we may not use), the maximum RAM is 80K. Things are better on the 5668, with 592K of RAM. So does anyone know if I can put Lua on bare metal? We're effectively not running an OS. If so, are there any estimates on what kind of memory footprint we might see? How much effort it would take? Failing this, does anyone know of any kind of interpreter that might be better in a memory-constrained environment without an OS? Or are we better just rolling our own?

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  • EFI VMware Virtual SCSI Hard Drive (0.0) ... unsuccessful

    - by Ravichandra
    I installed the VMware-workstation-full-8.0.0-471780 and created new virtual michin with Mac OSX 10.6.6 with 4GB Ram, 1 Processer, 40GB Hard Disk(SCSI) and General -- Guest Operating system : Apple Mac OS X, Version: Mac OS Server 10.6. when I Power On the the VMWare gives the follwing unsuccessfull comments. -- EFI VMware Virtual SCSI Hard Drive (0.0) ... unsuccessful -- EFI VMware Virtual IDE CDROM Drive (IDE 1.0) ... unsuccessful Could you please help me. how to solve this errors

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  • BSOD in a Hyper-V Guest VM on install

    - by Greg Hurlman
    I've got Windows Server 2008 R2 running as a development environment, with Hyper-V hosting a few different VMs. I've created a new VM - 4GB of RAM, 2 virtual procs, legacy network adapter, removed the SCSI interface. I'm booting to an ISO image of the Windows Server 2008 R2 DVD, for OS install. The problem is, after the "Windows is loading files" screen, but before the Windows logo animation, I get a blue screen: BAD_SYSTEM_CONFIG_INFO yada yada yada *** STOP: 0x00000074 (etc, etc) I've used this same ISO several times to install to other VMs, no issue.

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  • ESXi 5.0 GP Exception 13 World 2157

    - by rihatum
    1st time with Esxi 5.0, I have read the whitebox hcl and it states my box as compatible (Dell 960 Optiplex), I burnt Esxi install onto a cd and booted off it (without changing anything in bios) I only had a sata ssd connected, a usb flash 4gb (which i would have installed esxi on), It started loading fine and half way through it dumped a purple / pink screen with : GP Exception 13 World 2157 This system have 5GB RAM (2x2GB and 1x1GB), Intel VT is active in bios, Any suggestions or thoughts ? Will be grateful for your support Kind regards

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  • Where to find new Micro-BTX (uBTX) motherboards? Or should I just replace the box?

    - by John Rudy
    OK, so I'm guessing that it's dead. It's not my machine, and the owner is on a very fixed (IE, none) income. I'm generous, but I'm not that generous, since I already gave him what (at the time) was a fully functional and fairly well-equipped machine. (Aside from the mobo and proc, almost nothing else in it was stock. I'd taken it up to 3GB of RAM, upgraded the hard drive, added a decent video card, installed a wireless adapter, running Vista, etc.) According to further research, the machine uses a Micro-BTX (uBTX) motherboard, and since it's an AMD Athlon64, the AM2 socket. So I'm looking at a few options, and am wondering what's the best route to take? Find an AM2 socket uBTX mobo. I can't find them new online anywhere, leading me to believe that this is an obsolete form factor/chip combination. I don't want a refurb or a system pull because, quite honestly, once I deal with this mess, I don't want to go through it again in another year or two. Find an Intel uBTX mobo and a (relatively -- hah, I still want at least a dual-core) inexpensive Intel CPU. At this point, the only things stock in the machine would be the case and the PSU. :) Buy a bare-bones kit (mobo/proc/PSU/case, sometimes even RAM) from somewhere like CompUSA/TigerDirect or Fry's and move all of the other hardware over. This makes life difficult because the copy of Vista is an upgrade, tied to the copy of XP which shipped on the Gateway, which is OEM and won't install on the new box. :) If I change the CPU brand (AMD to Intel), will I need to reinstall Windows, or can it just be reactivated? Where can I actually find a new, in-box, not system pull, not refurb AM2 uBTX mobo? Do they even exist anymore? What kind of money are we talking (US dollars)? The end goal is to get the machine functional again as cheaply as humanly possible. If it were my own machine, I wouldn't even be asking this, I'd be custom-building a new one. However, it's not mine, I'm shelling out of pocket for the fix (plus the work), and thus want to keep that end price low-low-low.

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  • Vmware 7 AppHangB1 on windows 7 x64 (host) and windows xp (guest)

    - by frabiacca
    I'm having an issue running Windows XP professional guests using Vmware workstation 7.0.0 build-203739 in a Windows 7 Ultimate 64 bit host. My platform is a Dell Studio XPS 13 with 6GB RAM with an x64 processor. The VMWare freezes for up to 90s every 15 - 20 minutes, then just carries on as if nothing happened! I've no idea what the problem is ... Any idea?

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  • in-place upgrade Windows Server Standard Edition 2003 to Windows Server Enterprise/Datacentre Editio

    - by Systech
    I recently asked a question about upgrading from 2003 to 2008, but i realised this is a lot harder to do, the only reason i want to upgrade is to have increase the RAM Windows 2003 Standard Edition R2 only supports 4GB Windows 2003 Enterprise Edition R2 supports up to 32GB Windows 2003 Datacentre Edition R2 supports up to 64GB So basically i need to do an in-place upgrade to either Enterpirse or Datacentre without losing any data is this possible? Also is one easier to upgrade to then the other?

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  • php-cgi memory usage higher than php's memory limit

    - by Josh Nankin
    I'm running apache with a worker MPM and php with fastcgi. the following are my mpm limits: StartServers 5 MinSpareThreads 5 MaxSpareThreads 10 ThreadLimit 64 ThreadsPerChild 10 MaxClients 10 MaxRequestsPerChild 2000 I've also setup my php-cgi with the following: PHP_FCGI_CHILDREN=5 PHP_FCGI_MAX_REQUESTS=500 I'm noticing that my average php-cgi process is using around 200+mb of RAM, even as soon as they are started. However, my php memory_limit is only 128M. How is this possible, and what can I do to lower the php-cgi memory consumption?

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  • how to drop_caches in OpenVZ centos6 container

    - by Omar Jackman
    I have tried sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches' sudo echo 3 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches and a bunch of other variations but with every try I get bash: /proc/sys/vm/drop_caches: Permission denied How do I clear the ram used for buffers/cache in my centos6 openvz container? It seems like the only way to do what I need is to reboot the container.

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  • How can I resolve "A clock interrupt was not received on a secondary processor within the allocated time interval."?

    - by dimas bimayakti
    I've been troubled by my laptop problem lately. It always blue screen error every time I use it. Every time it becomes blue screen it shows: A clock interrupt was not received on a secondary processor within the allocated time interval. I don't understand what it means, and I even bought a new HDD and RAM, I also haven't install new programs but the blue screen always appears. Is there anyone who has same problem with me and knows how to solve this problem

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  • ESXi 5.5 on unlisted AMD A10 6800K possible?

    - by Erik
    I've done some initial googling.. and found AMD's A10 6800K supports virtualization via AMD-V. I'd like to install ESXI 5.5 on a USB thumbdrive to drive two+ VM's running Lubuntu. Has anyone seen the AMD A10 APU line used for baremetal hosting? AMD A10 APU 6800K 8GB DDR3 non ECC RAM 350GB HDD old spin drive (Sata I?III? unknown) I want to get started but afraid I'll wipe my current linux instance if it goes bad.

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  • Apache2 benchmarks - very poor performance

    - by andrzejp
    I have two servers on which I test the configuration of apache2. The first server: 4GB of RAM, AMD Athlon (tm) 64 X2 Dual Core Processor 5600 + Apache 2.2.3, mod_php, mpm prefork: Settings: Timeout 100 KeepAlive On MaxKeepAliveRequests 150 KeepAliveTimeout 4 <IfModule Mpm_prefork_module> StartServers 7 MinSpareServers 15 MaxSpareServers 30 MaxClients 250 MaxRequestsPerChild 2000 </ IfModule> Compiled in modules: core.c mod_log_config.c mod_logio.c prefork.c http_core.c mod_so.c Second server: 8GB of RAM, Intel (R) Core (TM) i7 CPU [email protected] Apache 2.2.9, **fcgid, mpm worker, suexec** PHP scripts are running via fcgi-wrapper Settings: Timeout 100 KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 4 <IfModule Mpm_worker_module> StartServers 10 MaxClients 200 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxRequestsPerChild 1000 </ IfModule> Compiled in modules: core.c mod_log_config.c mod_logio.c worker.c http_core.c mod_so.c The following test results, which are very strange! New server (dynamic content - php via fcgid+suexec): Server Software: Apache/2.2.9 Server Hostname: XXXXXXXX Server Port: 80 Document Path: XXXXXXX Document Length: 179512 bytes Concurrency Level: 10 Time taken for tests: 0.26276 seconds Complete requests: 1000 Failed requests: 0 Total transferred: 179935000 bytes HTML transferred: 179512000 bytes Requests per second: 38.06 Transfer rate: 6847.88 kb/s received Connnection Times (ms) min avg max Connect: 2 4 54 Processing: 161 257 449 Total: 163 261 503 Old server (dynamic content - mod_php): Server Software: Apache/2.2.3 Server Hostname: XXXXXX Server Port: 80 Document Path: XXXXXX Document Length: 187537 bytes Concurrency Level: 10 Time taken for tests: 173.073 seconds Complete requests: 1000 Failed requests: 22 (Connect: 0, Length: 22, Exceptions: 0) Total transferred: 188003372 bytes HTML transferred: 187546372 bytes Requests per second: 5777.91 Transfer rate: 1086267.40 kb/s received Connnection Times (ms) min avg max Connect: 3 3 28 Processing: 298 1724 26615 Total: 301 1727 26643 Old server: Static content (jpg file) Server Software: Apache/2.2.3 Server Hostname: xxxxxxxxx Server Port: 80 Document Path: /images/top2.gif Document Length: 40486 bytes Concurrency Level: 100 Time taken for tests: 3.558 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 40864400 bytes HTML transferred: 40557482 bytes Requests per second: 281.09 [#/sec] (mean) Time per request: 355.753 [ms] (mean) Time per request: 3.558 [ms] (mean, across all concurrent requests) Transfer rate: 11217.51 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 3 11 4.5 12 23 Processing: 40 329 61.4 339 1009 Waiting: 6 282 55.2 293 737 Total: 43 340 63.0 351 1020 New server - static content (jpg file) Server Software: Apache/2.2.9 Server Hostname: XXXXX Server Port: 80 Document Path: /images/top2.gif Document Length: 40486 bytes Concurrency Level: 100 Time taken for tests: 3.571531 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 41282792 bytes HTML transferred: 41030080 bytes Requests per second: 279.99 [#/sec] (mean) Time per request: 357.153 [ms] (mean) Time per request: 3.572 [ms] (mean, across all concurrent requests) Transfer rate: 11287.88 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 2 63 24.8 66 119 Processing: 124 278 31.8 282 391 Waiting: 3 70 28.5 66 164 Total: 126 341 35.9 350 443 I noticed that in the apache error.log is a lot of entries: [notice] mod_fcgid: call /www/XXXXX/public_html/forum/index.php with wrapper /www/php-fcgi-scripts/XXXXXX/php-fcgi-starter What I have omitted, or do not understand? Such a difference in requests per second? Is it possible? What could be the cause?

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  • Windows Server 2008 R2 vs Windows 7 Ultimate

    - by Techeretic
    I have a Dual Core Intel CPU E7200, 4 GB RAM, and a NvIDIA 8600 GT for graphics and 500GB HDD. This configuration runs Windows 7 Ultimate very smoothly, but now I recently signed up to the MS WebSiteSpark programme and have downloaded the Windows Server 2008 R2. So my question is whether I can use the Server Edition for my day to day use, play games, etc etc?? I want to install the Server OS to monitor my Home Network and also for some web development I have been trying out lately.

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  • Will An External Audio Interface Reduce CPU Load?

    - by Yar
    I am considering buying a very-low-latency audio interface like this one. One question is if it will reduce CPU load (I'm at about 60%+ and my Macbook has 2.4ghz and 4gigs ram) during intensive audio processing. If the answer is "yes," how will it compare to a different, cheaper firewire audio interface? My thought is that offloading the processing is always the same gain, regardless.

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  • ubuntu 12.04 is unresponsive

    - by Andreas Schiemann
    I've been using ubuntu 12.04 for 3 weeks. Today it become unresponsive and I lost stuff I was working on, I had the hand displayed, as if I selected something but in fact never did, but was reading an article online. I finally powered down the machine and then turned it back on. In windows there is the Task Manager where one can see whats taking up all your CPU or RAM, is there a such a program in ubuntu 12.04 and if not, can I install a app that has the same use?

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  • Capacity Planning IIS6

    - by user45457
    Hello, I am planning to host 5000 site with separate application pool. Based on my estimate there are around 1600- 2000 worker process will be running on the server. So my question is: Is is possible to host 5000 sites on a server with IIS 6. Server Configuration: 16 Core @ 2.27 Ghz CPU 8 GB RAM Please tell me if u require any other information. Kartik

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  • How can I set Windows Developer Preview resolution to 1920x1080 screen resolution

    - by Eugenio Miró
    I have a new monitor which I'm sharing between two computers: a laptop with Windows 7 (Win7 from now on) and a home assembled desktop with Windows Developer Preview (WinDev from now on). Win7 recognizes the monitor resolution of 1920x1080, and many others. WinDev doesn't; the best resolution I get on that OS is 1600x1200. Win7 has: Mobile Intel 965 Express video Generic PnP Monitor as monitor #2 WinDev has: MSI NVidia 9600GT with 1Gb RAM video Generic Non PnP Monitor I'm using Belkin Flip USB to share the monitor between boxes

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  • Full screen flash lags on Windows 7

    - by Chmod
    I have been experiencing an issue since I've up upgraded to Windows 7 where all flash videos have horrible frame rates when run in full screen mode. I have tried multiple browsers and i have the latest version of flash and video drivers. I have tried re-installing flash and disabling hardware acceleration. The problem occurs on youtube and hulu. This is a clean install on a Core 2 duo with 4GB RAM and an Nvidia 8400M GS.

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  • Why is Excel 2010/2013 taking 10 seconds open any file?

    - by jbkly
    I have a fast Windows 7 PC with two SSDs and 16GB of RAM, so I'm used to programs loading very fast. But recently, for no reason I can figure out, Excel has started taking way too long to open Excel files (of any size--even blank files). This is occurring with Excel 2010 and with Excel 2013 after I upgraded, hoping to solve the problem. Here a couple scenarios: If I start Excel directly, it opens almost instantly. No problem there. If I start Excel directly, and then open any Excel file (.xls or .xlsx), it loads almost instantly. Still no problem BUT if I attempt to open any Excel file directly, with Excel not running, it consistently takes 10-11 seconds for Excel to start. I get no error messages, just a spinning cursor for 10-11 seconds, and then the file opens. During the delay while Excel is trying to start, I'm not really seeing any discernible spike in CPU or memory usage, other than explorer.exe. This problem is only occurring with Excel, not Word or any other program I'm aware of. I've searched around quite a bit on this question and found various others who have experienced it, but the solutions that worked for them are not working for me. For a few people it was a problem with scanning network drives, but my problem is purely with local files; I have no network drives, and the problem persists even with all network connections disabled. Some people suggested worksheets with corrupted formulas or links, but I'm experiencing this with ANY Excel file: even blank worksheets. Others thought it was a problem with add-ins, but I have all Excel add-ins disabled (as far as I can tell). One person solved it by disabling a "clipboard manager" process that was running in the background, but I don't have that. I've disabled as many startup and background processes as I can, but the problem persists. I've run malware scans, disk cleanup, CCleaner, and installed Excel 2013. I've deleted temporary files, enabled SuperFetch, and edited registry keys. Still can't get rid of the problem. Any ideas? My system details: Windows 7 Professional SP1 64-bit, Excel 2013 32-bit, 16GB RAM, all programs installed on SSD.

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  • Nginx php-fpm high cpu usage

    - by Piotr Kaluza
    I have a problem with a high traffic wordpress, super high CPU load under nginx php-fpm, I am caching with apc, and memcached, spent 2-3 days tweaking configs and looking for answers it seems to me that php-fpm takes up all the cpu available no matter how many max_children i set if i set 5 then the load is 20% each, if i set 20 then the load adds up till 90% i tried static and dynamic server is 2x3.0Ghz 6GB Ram SSD in raid 10 on ubuntu 12.04 x64 utpime: 17:27:51 up 2:19, 1 user, load average: 29.79, 28.08, 26.29 what can be the issue?

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