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Maxrequestworkers centos. Mar 29, 2022 · My Environment CentOS 6.


  • Maxrequestworkers centos. 5? Jan 10, 2022 · Wondering what to do about the server reached MaxRequestWorkers setting error in Plesk? Click to read what our Support Team have to say. Increase Server View previous topic :: View next topic Feb 15, 2024 · Learn on how to optimize Apache HTTP Server for higher performance, understanding the real world examples and command lines. Perhaps Super User or Unix & Linux Stack Exchange would be a better place to ask. Where is the configuration file for Feb 28, 2019 · I have a server running CentOS 7. Any connection attempts over the MaxRequestWorkers limit will normally be queued, up to a number based on the ListenBacklog directive. Apr 23, 2024 · Where is the location of Apache's MinSpareThreads and MaxRequestWorkers configuration files ? Even though Apache is running, access to the website cannot be reached. 10, 64 bit, with 2 GIG Ram, and a Xeon E3 processor (4 core; 3. server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting Cause The limit continues to be reached because of a DDoS attack, or a very long response time for each request. Add a block like this near the top of your httpd. consider to research at "centos. One day at an exact second, all of those 6 servers got the scoreboard is full error, but the one with mpm event didn't. May 20, 2020 · here is a good hint: $ sudo apachectl -M | grep "mpm" AH00180: WARNING: MaxRequestWorkers of 1000 exceeds ServerLimit value of 256 servers, decreasing MaxRequestWorkers to 256. Old server works fine, new server reproduce performance problems : ( If I reinstall owncloud by same playbook, I In our series, we explore how to get the most out of your server through performance tuning in Apache. 웹서버 성능 튜닝이 필요한 이유 2. The articles below should help: Apache service goes down frequently on a Plesk for Linux Server: AH00484: server reached MaxRequestWorkers setting Apache keeps going down after increasing MaxRequestWorkers many times If the issue still arises, even when you keep increasing the number of Jan 23, 2020 · 아파치 에러 로그에 나온 server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers 내용처럼 MaxRequestWorkers 의 설정값을 높게 변경하도록 했습니다. 6. 튜닝 값은 가상서버의 메모리 사용량을 고려하여 산정해야 합니다. Based on your input you should increase the number of filehandlers to (at least) 20480 Feb 19, 2020 · Server reached MaxRequestWorkers setting error show up when the number of Apache handles high traffic. 4, the Prefork MPM will be used by default, but with Plesk 12. x is a general-purpose webserver, designed to provide a balance of flexibility, portability, and performance. x contains many additional optimizations to increase throughput and scalability. To increase, please see the ServerLimit directive. Here is how to change port number in Apache server. There is no MaxRequestWorkers parameter in the httpd. Linux 커널 튜닝 (1) Maximum file count 수정하기 (2) Open file Limit 수정하기 3. But as commented you do not want to have single machine to handle so big amount of requests. Introduction Tuning Apache's MaxRequestWorkers setting is essential to mitigate the risk of resource usage problems that could lead to a crash and ensure that your server can use its available resources. " Is this message harmful? I configure a event mpm and get the message AH03490. 04, and 0 is also the default in Centos 7. Sep 25, 2024 · In this tutorial, we'll learn how to optimizing Apache for high traffic websites. i keep getting server reached MaxClients setting, consider raising the MaxClients setting in the logs also apache runs really slow. This question appears to be off-topic because it is not about programming or development. Where is the configuration file for mpm_event with Plesk 12. MaxClients has been renamed to MaxRequestWorkers, which describes more accurately what it does. 41 it seems that if you set a large pagespeed cache eg. Yours doesn't reflect this rule. 3, release 2. 목차 1. 1 with WHM/Cpanel with 16GB, 8 CPU processors, and I've been having problem with multiple accesses concurrent, it seems it is not allowing, this is the Apache Configuration I set on Apache through the WHM (and right after, restarted apache). 16 I'm trying to load test a web application by starting to hit it with 100 users & ramp up all the way to 2500. 2 MaxRequestWorkers 150 MaxConnectionsPerChild 0 </IfModule> Feb 5, 2018 · 本文將以 CentOS 7 (Apache 2. I am using Apache 2. May 4, 2016 · Also make sure you allocate at least 25 threads (MaxRequestWorkers) for each server process because that appears to be the default (i. Apr 6, 2020 · A bug in Apache 2. Mar 22, 2014 · Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, Dec 17, 2021 · I'm using apache MPM event on my centos server with these configs: <IfModule event. I've done Prefork Sep 22, 2021 · As Apache serves your web pages to your visitors, the Apache configuration has a major effect on your server's performance, and, your website's performance. MaxRequestWorkers and ServerLimit should have equal or near equal values with MaxRequestWorkers never exceeding ServerLimit. ( from my point of view, they are confusing users, but this is only MY opinion! ^^ ) The ServerLimit directive represents the upper limit of MaxRequestWorkers. conf, before the LoadModule directives (this is what I use for a lower spec server): <IfModule prefork. I have 7 individual nodes for an application. Sep 20, 2023 · AH00287: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting AH00286: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting the scoreboard full message on the third node happened about an hour after these messages. Apache 웹서버 튜닝 (1) MPM 개요 AH00485: scoreboard is full, not at MaxRequestWorkers Solution Verified - Updated June 14 2024 at 6:35 PM - English Oct 7, 2025 · Often system administrators need to run Apache server on different port. 9GB still remains). I've done Prefork Mar 8, 2018 · Stack Overflow is a site for programming and development questions. 37. 8 (Apache 2. 16 (FPM) 2 Intel Xeon E5-2620 @ 2. Fix involves tweaking Apache parameters. Aug 2, 2019 · This blog article provides a detailed discussion about the Multi-Processing Modules (MPMs) of Apache and how you can tune these to improve your performance on Linux. Optimizing Apache server performance involves tuning key configuration directives like `MaxRequestWorkers` and `ServerLimit`, which control the number of threads and server processes. 즉, ServiceLimit 256 이고 ThreadsPerChild 64로 설정했기 때문에 총 16,384‬개의 동시처리가 가능해집니다. Please suggest best Prefork configuration for that. Compared to Apache 1. 3 Hard Disk 15RPM 145GB in RAID0 (by BIO Interesting Variables <IfModule mpm_event_module> StartServers 2 ThreadLimit 196 MinSpareThreads 96 MaxSpareThreads 192 ThreadsPerChild 96 MaxRequestWorkers 192 MaxConnectionsPerChild 96 Sep 12, 2013 · I am running centos 5. Jul 29, 2020 · Hello, CentOS 7, Apache 2. 6 (CentOS) OpenSSL/1. Click here for the solution. x Jboss Core How to calculate the MaxRequestWorkers for Apache httpd 2. It is also checked that when 1500 processes are reached the RAM has still plenty of space (i. Any connection attempt beyond the MaxRequestWorkers limit will normally be queued, up to a number based on the ListenBacklog directive. Feb 5, 2021 · Building from our last tutorial we will be discussing specific details on how to adjust the previously mentioned Apache configuration directives on the CentOS and Ubuntu types of VPS servers. X. x is capable of high performance in many real-world situations. This guide discusses estimating memory use and adjusting these settings to match server capacity while monitoring other vital resources like CPU and disk I/O to maintain efficiency and reliability. mpm_prefork_module (shared) Apr 30, 2016 · How to fix Apache scoreboard is full not at MaxRequestWorkers error May 24, 2019 · I am using CentOS v. Feb 12, 2015 · I manage a Centos 6. 5 it´s mpm_event. Oct 25, 2017 · I've configured Apache web server on my CentOs sever machine. Oct 9, 2019 · I've not detected any sign of cyber attack. 4 mpm event module forces Apache to freeze after a graceful restart (reload). What is the best method for me to know the maximum concurrent persistent connections that I can run from my server? Thank you for your replies. Nov 14, 2023 · CentOS - Apache MaxRequestWorkers issue Ask Question Asked 1 year, 10 months ago Modified 1 year, 10 months ago Sep 18, 2025 · To increase it, you must also raise MaxRequestWorkers using the following formula: ServerLimit value x 25 = MaxRequestWorkers value. Formula to determine the MaxRequestWorkers directive: The MaxRequestWorkers directive sets the limit on the number of simultaneous requests that will be served. 4), and is located in Apache’s configuration. c&gt; StartServers 8 ServerLimit 64 ThreadsPerChild 256 MaxRequestWorkers 16384 MaxConnectionsPerChild 10000 Sites which need to serve more than 256 simultaneous requests may need to increase MaxRequestWorkers, while sites with limited memory may need to decrease MaxRequestWorkers to keep the server from thrashing (swapping memory to disk and back). Essential tips for configuring Apache to improve performance and scalability. Feb 27, 2017 · Pls. Sometimes I get the message "AH03490: scoreboard is full, not at MaxRequestWorkers. The default value is 256; to increase it, you must also raise ServerLimit. Aug 24, 2021 · 「AH00485: scoreboard is full, not at MaxRequestWorkers」が表示される Solution Verified - Updated August 24 2021 at 5:48 AM - Japanese Apache keeps going down on a Plesk server and causing trouble? Our Support Engineers are here to help you out. so do I just add whatever changes I want to make to MaxRequestWorkers etc there and how do I know what limits to use? This is a server with 40GB RAM and 24 cores with about 30 virtual hosts/sites running on it. prefork 방식의 경우 동시 접속을 처리하는 MaxRequestWorkers의 기본값이 256으로 낮기 때문에 적당한 튜닝이 필요합니다. The Apache httpd server is running out of MaxRequestWorkers very quickly. 1e-fips PHP/5. Sites which need to serve more than 256 simultaneous requests may need to increase MaxRequestWorkers, while sites with limited memory may need to decrease MaxRequestWorkers to keep the server from thrashing (swapping memory to disk and back). 00GHz (8 core, 16 threads in each processor) 48GB RAM registered memory. 4) 和 CentOS 6. This article provides basic guidance for tuning MaxRequestWorkers. Apr 29, 2016 · AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting Asked 9 years, 5 months ago Modified 2 years, 6 months ago Viewed 174k times The MaxRequestWorkers directive sets the limit on the number of simultaneous requests that will be served. For me, situation reproduce. This means that on both the Apache processes will not expire. Most of these Feb 27, 2015 · This guide provides you with information on tuning the performance and configuration of your Apache web server to optimize the load times of your website. You need to specify ServerLimit value. # # KeepAlive: Whethe Dec 19, 2017 · so do I just add whatever changes I want to make to MaxRequestWorkers etc there and how do I know what limits to use? This is a server with 40GB RAM and 24 cores with about 30 virtual hosts/sites running on it. 1 ghz). 3, php 5. Jul 6, 2019 · 本文將先講解何謂Apache的多進程處理模式（Multi-Processing Module，MPM），透過此種模式為何能夠充分發揮主機硬體的效能。然後，再介紹httperf這個網站壓力測試軟體，說明如何其安裝及使用，示範怎樣透過此工具軟體測試出網站伺服器的最大服務效能極限。 Dec 17, 2021 · I'm using apache mpm event on centos server with the following configs: &lt;IfModule event. NOTE1: ServerLimit is not in the default configurations for either Centos 7 or Ubuntu 14. Under prefork, the MaxRequestWorkers determines how may concurrent requests the server will handle. How to increase MaxRequestWorkers? Httpd only allowing 256 connections in Prefork mpm Environment Red Hat Enterprise Linux (RHEL) 7. I can see that Apache has requests denied when this happens. The MaxRequestWorkers directive is typically set in the Apache configuration file (httpd . For some reason, one is running on mpm event and others are worker. Note: If ServerLimit is lower then MaxRequestWorkers then you will get the following error: [root@apache ~]# httpd -t AH00180: WARNING: MaxRequestWorkers of 500 exceeds ServerLimit value of 256 servers, decreasing MaxRequestWorkers to 256. There is a set number of requests that Apa To increase it, you must also raise MaxRequestWorkers using the following formula: ServerLimit value x 25 = MaxRequestWorkers value. Feb 19, 2017 · It's not included in the default config that comes with CentOS 7. If you are hosting other applications on the server, subtract the total memory used by these applications, and leave some free memory. org", which recent bugs are resolved / updated / upgraded for your apache - webserver on the official CentOS - repos. 4 なお、プロセス数の指定するディレクティブがありませんが、 MaxRequestWorkers の値を ThreadsPerChild で割った値 ServerLimit 40 StartServers 25 MaxClients 1000 MinSpareThreads 25 MaxSpareThreads 75 MaxRequestWorkers 1000 ThreadsPerChild 25 MaxConnectionsPerChild 0 However, when I check the server-status I can not see more than 400 workers simultaneously. 37 Red Hat Enterprise Linux (RHEL) 9. It determines the maximum number of child processes or threads that can be spawned by the server to handle incoming requests. You can change ThreadsPerChild if you like, we left it at default. ServerLimit 16 StartServers 2 MaxRequestWorkers 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 While the parent process is usually started as root under Unix in order to bind to port 80, the child processes and threads are launched by the server as a less-privileged user. 39. Once per day, logrotate rotates the Apache logs by doing a graceful restart (reload): [mpm_event:notice] [pid 1413:tid 140292271810880] AH00493: SIGUSR1 rec Dec 4, 2017 · From the MaxRequestWorkers documentation: For non-threaded servers (i. 872755 2020] [mp This limit is defined by the parameter MaxRequestWorkers (Apache 2. Apache 2. May 10, 2016 · Previous installations for production used CentOS 5, older version of Apache and MySQL, and Tomcat 5. Nov 18, 2013 · The Apache Web server controls concurrent connections using the ‘MaxRequestWorkers’ directive and '256' is the default value of MaxRequestWorkers. Our third tutorial explores Apache MPM Modules and recommended directive settings for environments. 5 with 768mb ram. 6 in RHEL7 based on physical memory and cpu core in the system? How to calculate the MaxClients for Apache httpd? Oct 18, 2016 · What httpd conf settings do I need to change to increase the max number of concurrent connections for Apache? NOTE: I turned off KeepAlive since this is mainly an API server. Increase ServerLimit. If you don't allocate enough threads the additional servers will not start. If you need to change this value, modify it in the configuration file and restart Apache: Jul 9, 2015 · StartServers 3 MinSpareThreads 63 MaxSpareThreads 127 ThreadsPerChild 382 ThreadLimit 382 MaxRequestWorkers 3056 ServerLimit 3066 MaxConnectionsPerChild 4000 Quote from: cyberspace on May 31, 2023, 08:56:56 PM You just need to change the value in the appropriate section (prefork, worker, event) of: Code: [Select] Oct 1, 2021 · [mpm_event:error] [pid 203001:tid 139981493594432] AH03490: scoreboard is full, not at MaxRequestWorkers. Oct 14, 2018 · 投稿日: 2018年10月14日 日曜日 15:03 by もりぞう カテゴリ: テクニカルインフォ CentOS 7 やRHEL 7 にyumでapacheをインストールすると、2. The Apache docs suggest it should be MaxRequestWorkers / ThreadsPerChild, definitely not the same as MaxRequestWorkers. 6 Red Hat Enterprise Linux (RHEL) 8. Symptoms Apache keeps going down after reaching the MaxRequestWorkers limit even after increasing it multiple times. e. Feb 20, 2024 · Topic: scoreboard is full, not at MaxRequestWorkers. Resolution Decrease the values of the MaxRequestWorkers and ServerLimit directives: Note: The default value of MaxRequestWorkers and ServerLimit is 256. Also increasing mean the value mean more CPU, more RAM. Process count is identified by following command Apache httpdサーバーには、同時接続の最大値が決まっている。 [mpm_event:error] [pid 3425:tid 281472892462448] AH00484: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting [mpm_event:error] [pid 3425:tid 281472892462448] AH10159: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting など 摘要 为了同时处理多个请求，您可以将Apache的MaxRequestWorkers参数设置得更大。 对于Apache 2. Cause Too high values are set for the Apache MaxRequestWorkers and ServerLimit directives, due to which all RAM is being used by Apache and new processes cannot be spawned. 4 X86_64 Apache 2. 1 GB and use HTTP connections, Apache stops responding after something like [Wed Jul 29 07:20:17. The comments on that medium article also discuss this. 4, MaxClients is now renamed as MaxRequestWorkers, and so any documentation regarding MaxClients needs to be switched to MaxRequestWorkers. Monitoring of Apache threads and implementing a workaround is crucial. 4. when i look at cacti grap Oct 20, 2023 · The usual practice when increasing MaxRequestWorkers is to increase also ServerLimit. c> StartServers 8 MinSpareServers 5 MaxSpareServers 20 ServerLimit 256 MaxRequestWorkers 200 MaxConnectionsPerChild 1000 </IfModule> MaxClients has been renamed MaxRequestWorkers Jul 9, 2009 · Hello @abanico, First of all, I would recommend checking what exactly causes so many workers to be spawned. Use the MaxRequestWorkers (Apache 2. I want to increase 5000 concurrent request with MPM_Prefork. AH00286: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting AH00287: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting Have you an idea about what is going on ? Oct 13, 2024 · The MaxRequestWorkers parameter defines the maximum number of simultaneous connections Apache can handle. More information about tuning process creation is provided in the performance hints documentation. 4) parameter in the Apache configuration to set the quota. 본 매뉴얼은 대규모 Apache 웹서버 동시 접속 유입에 대응 하기 위해 성능을 최적화하는 방법을 소개합니다. Except that it does. What does it mean? Do we need to increase a value of ServerLimit directive? Hi there, with CentOS 7 and Apache 2. Apache is the front end, it uses AJP to connect to a Tomcat backend. For non-threaded Prefork servers, MaxRequestWorkers represents the maximum number of child processes that are launched to serve requests. This will give "space" of distribute the requests over the processes. For non-threaded Prefork servers, MaxRequestWorkers represents the maximum number of child processes that Apache launches to server requests. 6 server (with cpanel expired license / maybe it's not important) with 8 cores and 64GB RAM and my HTTP server becomes very slow when it reaches between 250 and 300 simultaneous Feb 10, 2021 · FYI, on an unrelated note - the article's ServerLimit recommendation is wildly incorrect. See below for more information on how to define the MaxRequestWorkers directive. x JBoss Web Server (JWS) 3. Although it has not been designed specifically to set benchmark records, Apache 2. Mar 29, 2021 · I'm running CentOS 8 with Apache 2. if 5 Servers x 25 ThreadsPerChild = 125 MaxRequestWorkers). See What topics can I ask about here in the Help Center. If set correctly, it will queue additional requests and handle them as earlier requests are processed (usually quickly). The old name is still supported. 04 which means that if you set MaxRequestWorkers above 256, you must remember to add ServerLimit! NOTE2: MaxConnectionsPerChild set to 0 on Ubuntu 14. Learn how to optimize your Apache configuration for high traffic websites and improve website performance. Resolution Use the following guides to identify whether the problem is caused May 4, 2016 · The apache details - Apache/2. Apr 22, 2015 · Also, recognize that starting in Apache 2. For example, if ServerLimit is set to 20, then MaxRequestWorkers will be 20 x 25 = 500. Dec 17, 2015 · Hi there, with CentOS 7 and Apache 2. 4版本，不再使用MaxClients参数，而是使用MaxRequestWorkers参数来达到同样的目的。 确认错误日志 首先，我们要确认一下是否存在由于Apache并发连接而导致的瓶颈。 Mar 19, 2020 · Install Apache on your CentOS 8 server, configure virtual hosting, and set up modules and scripting. 4系のapacheが入ります。 そして、MPMは prefork がデフォルトです。 # MaxRequestWorkers: maximum number of server processes allowed to start # MaxConnectionsPerChild: maximum number of requests a server process serves <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 # same as MaxClients in Apache 2. Feb 7, 2021 · Serverがプロセスに関する設定を指し、Threadがスレッドに関する設定を指す、と見ていけば良さそうです。 基本的には、こちらに書かれている内容です。 mpm_common - Apache HTTP Server Version 2. c> StartServers 8 ServerLimit 32 ThreadsPerChild 256 MaxRequestWorkers 8192 MaxConnectionsPerChild 10000 Jul 2, 2022 · StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestWorkers 550 ServerLimit 32 MaxConnectionsPerChild 0 </IfModule> Can anyone tell me an optimal configuration of the MPM according to the requirements and characteristics of the server? Sep 3, 2019 · You can manually calculate MaxRequestWorkers by determine the average amount of memory consumed by Apache and divide it into your total available memory. But there is a note in the ServerLimit documentation: Jan 22, 2022 · “server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting” At this time, note clearly - The Apache may get slow in the Plesk server. Once a child process is freed at the end of a different request, the connection will then be serviced. Oct 1, 2018 · MaxRequestWorkers 400 MaxConnectionsPerChild 0 </IfModule> I haved checked the maximum apache processes by JMeter stress tester and it doesnot expand more than 1500 processes. Old server is one, new server deployed by Ansible. Syntax OK Jul 23, 2019 · server reached MaxRequestWorkers settingとなってしまうのが直接的な原因かと思いますが、 アクセスが集中していない深夜帯の午前4時頃にも起こっている原因がわかりません。 Jul 27, 2017 · Thera T K Issue Apache crashes: "server reached MaxRequestWorkers setting" King555 Aug 6, 2018 Plesk Onyx for Linux Replies 8 Views 8K Sep 12, 2018 Aug 8, 2024 · MaxRequestWorkers MaxRequestWorkers is a configuration directive in the Apache web server that specifies the maximum number of simultaneous connections that the server can handle. 6, no any cache systems, sqlite (!) // worked fine/// to new server: centos 7. x - Apache httpd 2. , prefork), MaxRequestWorkers translates into the maximum number of child processes that will be launched to serve requests. 2) 為範例，不過參數調教適用於所有 Linux Apache。 Windows平台就只能使用MPM Winnt，因此 Windows Apache 的使用者讀這篇文章就比較難獲得直接幫助。 Jul 19, 2025 · Webサーバーのパフォーマンスは、Webサイトやアプリケーションの応答速度に直結する重要な要素です。中でもApacheの MaxClients （現 MaxRequestWorkers）設定は、サーバーの能力を最大限に引き出すための鍵となります。 この記事では、 MaxClients の役割から、サーバーのスペックに合わせた適切な値の Mar 23, 2023 · Cause Too high values are set for the Apache MaxRequestWorkers and ServerLimit directives, due to which all RAM is being used by Apache and new processes cannot be spawned. conf file. For async MPMs, like event, the maximum number of clients is not equivalent than the number of worker threads. 0. If you set it too high, the server will start to use swap space and then (quickly) die. MaxRequestWorkers limits the number of simultaneous requests that will be served at any given time and also the number of allowed processes (MaxRequestWorkers / ThreadsPerChild); meanwhile, the Scoreboard is a representation of all the running processes and the status of their worker threads. This guide covers key techniques like caching, compression, and limiting access to resources for better results. Feb 16, 2016 · Steps to reproduce and Expected behaviour Tell us what should happen To reproduce, I've updated from owncloud-8. Apr 6, 2017 · If your static content is not on a networked filesystem you can use EnableSendFile, KeepAlive, yes I usually allow around 80% of maxrequestworkers, but that's just me probably. Optimize Web Server Performance by Tuning Apache The article defines the procedure of tuning the Apache server to increase its performance and optimization. Apr 19, 2020 · For example, MaxRequestWorkers should be ServerLimit times ThreadsPerChild. Mar 29, 2022 · My Environment CentOS 6. MaxRequestsPerChild has been renamed to MaxConnectionsPerChild, describes more accurately what it does. x Apache httpd-2. 4 PHP 5. For servers under high load this value should be increased. Symptoms Apache takes in requests for the content that you are hosting in your environment and sends that information out to anyone that is requesting it. 4p09gsp5 xugz gz1q 1kqa ja m1u9a quxw8 n6n zar5x muhkv

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