All aspects of high-loaded systems development and maintenance.

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2answers
3k views

Optimize php-fpm and varnish for a powerfull server

My setup is: Intel® Core™ i7-2600 and RAM 16 GB DDR3 RAM varnish+nginx+php-fpm+apc for a not very heavy WordPress blog with W3 Total Cache and CDN My problem is that after 55 hits per second ...
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2answers
444 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 ...
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2answers
190 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 ...
1
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2answers
772 views

System load average is extremely high

I own a website which is running on a VPS since last week. From monday until saturday, everything is going smoothly. The website has around 4.500 unique visitors a day, and the load average and ...
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2answers
518 views

Squeeze Server freezing under heavy cpu / disk / network load

i would like to ask for help since i am feeling a bit clueless here. I recently bought a low end dedicated machine that was supposed to host some services: squid, proftpd and rtorrent. I installed ...
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1answer
42 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 images)....
1
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1answer
326 views

How to graph the web server load by using the nginx logs with response time?

I want to analyse if certain type of requests do have an important impact on the server. My backend service is behind nginx which logs all requests including the time needed to get the response. Now ...
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1answer
640 views

Linux NIC bonding failure; strange CPU load

Note: An update as been added below I'm having a very strange issue with a Linux server (Debian 6.0.6) using 802.3ad NIC bonding. Occasionally all of the NICs in the bond get marked as down and the ...
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1answer
140 views

Extremely high loads despite Caching

Okay I've got a nice dedicated server running CentOs 6 with 16gb of ram, dual xenon processors, etc. However I've been experiencing high loads due to mysql. Randomly the load will go below 1.0, and ...
0
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1answer
15 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 ...
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1answer
15 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 ->...
0
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1answer
233 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 ...
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1answer
672 views

12.04 Migration Process time delay

We have an issue in our server that is the migration process in taking time and also the load in the server is getting high due to that. No LSB modules are available. Distributor ID: Ubuntu ...
0
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1answer
69 views

Recording traffic for later replay

In these days we're experiencing huge (based on our recent experience) traffic on our platform, this is slowing us down to a crawl. Today we will probably handle the problem by cutting away a couple ...
0
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1answer
241 views

mysql and phpthumb killing the server

I installed GD and ImageMagick the other day and since that day phpthumb() which it is installed on my wordpress killing the processor. I've transfered my website from an old server to this new one ...
0
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1answer
257 views

erratic response times with Apache 2.0.52 on redhat 4

Under load, we've noticed response times from Apache vary greatly for the same 7k image. It can range anywhere from .01 seconds to 25 seconds or greater. Unfortunately, due to corporate policy ...
4
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0answers
60 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. ...
2
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0answers
46 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 ...
2
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0answers
326 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 ...
2
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0answers
352 views

Load Average problems while serving 40M requests daily with php-fpm, nginx

I have server with FreeBSD (16 cores with HT, SSD, 32Gb RAM) which is getting about 40M http requests daily. All requests are served by nginx + php-fpm. At these graphs you see that we have a ...
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0answers
175 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 ...
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0answers
68 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 ...
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0answers
19 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. ...
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0answers
67 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 ...
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0answers
41 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 ...
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0answers
127 views

high linux server load

I have a problem with high server load (load average from 10 to 100+) when there is a lot of web traffic. There are also noticable delays when reading/writing files. Machine is a Apache web server. ...
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0answers
852 views

nginx does not close loopback connections

I'm using nginx in reverse-proxy mode. Here's relevant part of config file: server { listen 80; server_name ~^web.redhelper\.ru$ ; access_log off; location /http-bind { ...
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0answers
32 views

Grab process information about high process usage

I'm looking to grab process information about processes that are using over a certain CPU limit. Ex: #!/usr/bin/env python def get_processes_over_usage(cpu_usage): #Find the processes. ...
0
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0answers
120 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 ...
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0answers
105 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 ...
0
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0answers
27 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
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0answers
44 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 ...
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0answers
305 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 ...
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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
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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 ...
0
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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
139 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 ...
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0answers
71 views

Strange load average behaviour

We have a daemon which collects system data and writes it into database. Sometimes the load average goes very high without apparent reason. Here is sample output. | id | server_id | datetime ...