All aspects of high-loaded systems development and maintenance.

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-2
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1answer
112 views

top: sy higher than 70: What is going on here?

From the man page of top: sy: time running kernel processes The sy-value has peaks with values above 50, and then goes down to about 5 again. What could be the root of it? Here are two ...
0
votes
1answer
13 views

How to load balance streaming connection on the client side

I'm not entirely sure whether this is even possible, but I thought I'd ask all the same. So we have a service that connects to a streaming API which keeps a connection open and we receive JSON ...
0
votes
1answer
33 views

Advice about running nginx or nginx + apache [duplicate]

I would like to share my situation because maybe helpful to others, and I need some advice. I administer a VPS with some web servers and high traffic. The systems specs are x2 Xeon E2620 with 2 ...
1
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0answers
123 views

Identifying bottleneck with nginx VPS load testing

I'm trying to optimize a Digital Ocean droplet (512mb), testing using loader.io I'm testing on my homepage, which is HTTPS / PHP. I setup FastCGI page cache, which got me from 100 req/sec to 2,000 ...
1
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0answers
65 views

High load with Nginx - with low traffic websites

Once in a while (maybe once a day?) I've got a load average of 10. That lasts for like 30 min (where I can't reach any of websites on this server) and then it's fine again. I just happened to be via ...
4
votes
1answer
118 views

Load testing at 350,000 requests per minute [closed]

I need a way to reproduce the sudden burst of traffic our site experienced a while ago, to have a chance to keep our stack working. Our load balancer reported at a certain point that some 350k ...
1
vote
3answers
247 views

Bots hitting xmlrpc.php and causing high load on the server

Recently we are having a lot of hits to wordpress xmlrpc.php which in end causes high load on the servers. We tried rewriting all xmlrpc.php to 127.0.0.1 but didn't help much. Since apache was ...
3
votes
0answers
47 views

Strange values in linux system load

I am trying to understand system load on one linux server: $uptime 15:01:45 up 52 days, 19:48, 1 user, load average: 0.63, 1.76, 4.81 Loads are always 1 minute < 5 minutes < 15 minutes. ...
0
votes
1answer
14 views

Understanding the concept of highload application

So, I have an idea of creating highload app using Ruby on rails. However there are some questions about the conception of the project. The main idea is Client->Load Balancer -> Server_1 ...
1
vote
1answer
37 views

adding application server does not improve preformance with haproxy

I am running a haproxy load balancer in front of two application servers that serves images. The problem is that if i use one server or two does not make a difference on performance (see added ...
0
votes
2answers
60 views

Server slow, but plenty of CPU & RAM

My site has gone from getting 20,000 visits/day, to 182,000 yesterday, due to being featured on a number of popular sites. The site has become somewhat unresponsive. Many requests will lead to a ...
1
vote
0answers
18 views

server large jiffies during boot(Calibrating delay loop…)

The server behaves abnormal, I checked the dmesg log , found the jiffies is very large during boot, between Detected cpu and Calibrating delay loop.. reboot the server does not solve the problem. ...
2
votes
0answers
40 views

Zimbra server - High CPU Utilization

I have used Zimbra server a number of times and it's great, but each time I had to abandon it because of a CPU utilization issue. The mail servers I set up are commonly small organizations with only a ...
1
vote
0answers
58 views

wired dmesg output and high cpu load

I have like 50 Linux servers with the same hardware and kernel, but recently found that some of them suffers from high CPU load, runs very slowly, top and ps show TIME column with impossible large ...
1
vote
2answers
309 views

MySQL and high jdb2 io/wait

I am running MySQL 5.5 with InnoDB tables. There are about 200 queries per second. There are also tables with 500 000 or more rows. But I have big issues with server load and io/wait especially with ...
1
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0answers
40 views

handle 2k image request a second with nginx

We have made an app that displays dynamic images. We are trying to handle a load of 2k image request a second with nginx. The size of the image is about 0.13 mb and we are using php with this code to ...
0
votes
0answers
109 views

too many php-cgi.exe instances in IIS 7.5

I have a Windows Server that has random spikes of high CPU usage and upon looking at ProcessExplorer and Windows Task Manager, it seems that there are a high number of php-cgi.exe processes running ...
0
votes
0answers
90 views

nginx + php-fpm high load - Warning pool www seems to be busy

I'm getting this messages: [26-Oct-2015 21:45:07] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 97 idle, and ...
1
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2answers
292 views

High server load with no processes using CPU?

I'm new to managing servers, and I've run into something that's stumped me. I received a warning from my VPS provider informing me that my load usage was very high. I hadn't run into this problem ...
-3
votes
2answers
29 views

Child proc in highload

I need to know why this child proc is using 208% of my CPU. I think it would be a good idea to find the pathname of it. Do you have any idea how to find it? 4910 root 20 0 9691M 2006M 7924 R 208. ...
0
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0answers
26 views

strace a series of processes, that does short CPU load bursts?

I have a server, where php-fpm pool processes start to consume too much CPU. But each process causes high CPU load only for a short period of time and I cannot catch even one such process at that ...
0
votes
2answers
239 views

qemu-kvm take 100% cpu during start Win 7

I have Centos 6 with qemu-kvm version: qemu-kvm.x86_64 2:0.12.1.2-2.448.el6_6.4 On Dell Precision with 2x Xeon 5110 When I run VM qemu-kvm process take 100% of CPU and starting Windows on ...
0
votes
0answers
40 views

Server crashes with incredibly high load

I got a problem with a KVM-virtualized server (Proxmox-based), running on Debian 7.8 and PLESK. Sometimes there are loads > 200 (sic!) and I just do not get the reason why. The monitoring shows the ...
0
votes
1answer
132 views

run cron job only if load not too high

I need to synchronize two systems, so the producers list new entities to be created on the consumer app. It has no realtime need (mostly for datamining, so being a few hours behind isn't an issue), ...
4
votes
3answers
971 views

Is it possible to use multiple load balancers to redirect traffic to my application servers?

I'm new to load balancing and I'm wondering if it's possible to use multiple load balancers to redirect traffic to my application servers. I don't really understand how this can be done. Shouldn't a ...
0
votes
1answer
218 views

haproxy-varnish can't reach 6k requests

Issue I can't reach 6k requests/seconds. I get a lot of timeouts. My response time goes as high as 26 seconds. Intro I am setting up a server that will host a 100MB static-website. The thing is ...
0
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0answers
96 views

Changing value of tcp_fin_timeout in unix machine

I was looking at this article in which they have mentioned how to increase two property for better performance of application if we see lot of TIMED_WAIT connections My question is: if I modify ...
1
vote
2answers
65 views

Medium CPU usage but high load

I know this has been asked multiple times, and generally wa causes high load even if CPU isn't the culprit. However, in our case, wa is ~0 and CPU is at ~45% on a 4 core, 8 thread dedicated server. ...
0
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0answers
263 views

Too many php session files created on one server

We have a web application running multiple instances on different plesk servers. On one server we see quick generation of php session files under /var/lib/php/session directory. Which grows in 100 ...
0
votes
1answer
127 views

Does Nginx keep the connection open, when it does load balancing?

I have a single Nginx server doing load balancing to several upstream servers. What happens when a request comes in? Does the load balancer keep the connection open and wait for an answer from the ...
0
votes
1answer
125 views

mysql and redis services unavailable during high traffic times

I've have a webserver that runs some services like Apache, Mysql, Redis and some NodeJS apps. On times of high traffic my server seems to do not support the heavy load. When it's ocurring, often when ...
0
votes
2answers
150 views

How to speed up (very remote) overloaded server connection

I'm living in France and I need to load a page from a far far away server (still in the same galaxy). "Far" is Canada to me, meaning over 8 000km of internet cable. The problem is, this server is ...
7
votes
4answers
1k views

Why is my web server dropping connections with a TCP reset at high load?

I have a small VPS setup with nginx. I want to squeeze as much performance as possible out of it, so I've been experimenting with optimization and load testing. I'm using Blitz.io to do load testing ...
1
vote
3answers
2k views

Kernel Processes Periodically Eating CPU During High Load

I run a production web server with 24 cores in which the work is both CPU and I/O intensive, but mostly CPU. My scripts delay execution when total CPU load is ~85% or higher in order to keep the load ...
0
votes
0answers
19 views

VServer Apache: Is 5s page load normal for ~100 clients?

I administrate a virtual server with 16x Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz with a shitload of 32GiB system memory. The server is used as a web server and has 100 to 150 users at rush hour. In ...
0
votes
1answer
45 views

Find the VirtualHost that got hight traffic from multiple log files

Sometimes my Apache server get high load. I have a lot of VirtualHost, each one having its own log file. The structure is like this /var/www/httpd-logs/virtualhost.com.access.log What command could ...
0
votes
1answer
206 views

Tomcat 8.15 APR Poller failed with error 610,038

I was testing my server with JMeter but when I reach an Highload the server tends to have this error logged on the console and it keeps a lot of active threads on apparent deadlock : 30-Jan-2015 ...
0
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0answers
64 views

Bottle neck of nginx?

I'm using nginx as a load balancer on amazon ec2 m3.large instance. This load balancer will receive loads from a load generator and distributed them to the 3 instance with mysql database serves as ...
2
votes
0answers
296 views

High network softirq requests for kernel 3.10 under a lot of traffic

We have been experimenting rolling out 3.10 series kernel that's provided by centos via the centosplus repo for v6. We have been noticing something interesting where under the same load the load for ...
0
votes
1answer
232 views

Choose hardware for MySQL server with 1-2k rps [duplicate]

I am looking for new DB server. I'd like to know your opinions and recommendations. Current server spec: We use DB server for website with 100-200 req per sec(i plan growth up to 200-250) Today we ...
10
votes
4answers
3k views

ps aux hanging on high cpu/IO with java processes

I'm having some issues with java process and nrpe checks. We have some processes that sometimes use 1000% cpu on a 32 core system. The system is pretty responsive until you do a ps aux or try to ...
1
vote
1answer
113 views

Diagnose what is causing Linux system load

I understand that system load is kernel usage such as IO or network. If you don't believe you have high load of either of those two items, what would be some recommended steps to track down what is ...
0
votes
1answer
752 views

Too Many index.php processes with high memory usage [closed]

I have wordpress site installed over dedicated server in a separate cpanel account. From couple of days this account experiencing high memory usage, high loadtime and freezing frequently. so I have ...
1
vote
2answers
167 views

How to crash Oracle VM intentionally by loading system parameters

I am using Oracle VM. I want to perform a stress test on system parameters like CPU, RAM etc. Can anyone help me out with the ways in which I can load the parameters with high load like using all the ...
0
votes
2answers
92 views

How to Fix/ solve Very High serverload on Cents os 6 VPS

My VPS is constantly on High Load from last 2 days , cant figure out what the problem is . here are more info about vps. VPS acts as HTTP(Apache), Mysql, Proftp Server, not much traffic., daily approx ...
0
votes
2answers
2k views

Apache returns default page instead my content

My web site works perfect, but sometimes apache returns default html page: It works! This is the default web page for this server. The web server software is running but no content has been added, ...
11
votes
4answers
5k views

How far is “too far off” for ntpd? Can it get there by a sudden jump to heavy load? Can this be overridden?

In many primers on ntpd, like this one, there's always a warning that ntpd will stop resetting the clock "[if] your clock is too far off." How far off is "too far off"? Also, if a server takes a ...
0
votes
0answers
4k views

High Performance AWS EC2 / RDS + Nginx + PHP-FPM setup

General description of the issue We're currently running an application on a PaaS type solution for PHP. Their solution is based on AWS cloud and due to the fact that their plans don't fit our ...
0
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0answers
136 views

high mysqld cpu usage after moving to new server

Just moved to a new (more powerful) server with only one website running on it, no changes on the website, but now I got a horrible high CPU load and I can't find out why. top: top - 22:54:08 up 1 ...
0
votes
1answer
152 views

Strange overload on apache2 web server [closed]

I recently inherited a web server setup from another developer. Its basically the following: 2 web servers running apache 2 2 load balancers running nginx 2 database servers running MySQL Every week ...