Questions tagged [high-load]

All aspects of high-loaded systems development and maintenance.

Filter by
Sorted by
Tagged with
1
vote
2answers
57 views

Distributing load over multiple load balancers

Given a website that could have many hundreds of thousands of concurrent users at peak times how can one manage the laod where load balancer resources can only support 40,000 concurrent connections? (...
0
votes
0answers
9 views

Asterisk AGI -> Bash-Script -> causes choppy audio

for the last days i replaced 90% of my extensions.conf to an external AGI-Bash-Scripts. After that, the audio was choppy in both ways for all running channels, when the AGI-Script gets executed. After ...
0
votes
1answer
60 views

Mysql High cpu load

I have a dedicated server with 48 cores, 128 GB of Ram, 2 nvme with RAID. I have a pretty large WordPress site with 5 GB of MySQL database. The concurrent traffic for the site is from 200 to 700 users....
0
votes
0answers
20 views

High average load + low cpu usage + low disk usage + normal network usage + normal memory usage = ok or not?

I see high CPU average load several times a day on my server. For example, 21:20 and 22:45 on the following figure: However, my CPU, disk, and network are all OK: Disk Network CPU Memory Also do ...
0
votes
0answers
17 views

mosquitto server taking 97-100% cpu . and cant connect to it

I amusing mosquitto as a mqtt server. Its a live server. From last one day I am not able to connect to it and on checking the cpu usage by top i see that its giving full load to cpu PID USER PR ...
2
votes
0answers
91 views

High Docker disk read utilization on startup

My Docker server is very slow to start up. It's in Swarm mode, and each service restart (or just server reboot) it uses 100% of disk utilization, however it takes about an hour to start up. I tried ...
0
votes
2answers
102 views

Windows 10 VM pegs CPU at 100%

We have a Windows 10 VM with one vCPU and 8 gigs of RAM. It runs an HVAC design software that various users can RDP in and use. We've noticed that sometimes, the CPU will (seemingly randomly) max at ...
1
vote
2answers
79 views

How to diagnose what Java process is doing in kernel space

We have a problem with one Spark (Java) application on our Hadoop cluster. When this workload gets scheduled on 3 machines in our cluster kernel space CPU usage gets a very high. Example recording ...
0
votes
1answer
193 views

Nginx socket reverse proxy got 503 responses on concurrent requests

I am using Nginx as a reverse proxy for my PHP base WebSocket application and I try to load test the WebSocket server with Nginx reverse proxy. And I got 503 errors when concurrent users reach around ...
0
votes
1answer
339 views

RDS MySQL Insights: Top Query “commit”

We are trying to reduce the load on our AWS RDS instance by going through the performance insights. The top SQL statement listed in the insight is "commit": In particular, the commit ...
0
votes
0answers
17 views

Using core affinity for Debian servers: isolate core to specific tasks?

I currently have an 8-core web server that is running into load problems due to heavy amounts of image processing--Imagemagick and other associated software will often spike the server's load up to 50+...
4
votes
2answers
187 views

CPU load for high performance computing

Is there a reasonable/safe level of CPU load in the context of high performance computing? I understand the meaning of load average for servers in general, but do not know what to expect for servers ...
0
votes
1answer
270 views

Directadmin Warning The system load average is X

I am not a server guru, could somebody help me understand what part of my server is under load and what can I do to fix this? My best guess is too many connection to node server + mysql, becuse most ...
1
vote
0answers
50 views

PHP high I/O after a DDoS attack

I've had a large scale DDoS attack on my website. After I've enabled captcha challenge through CloudFlare and the attack stopped, PHP's I/O was still loaded at 99%, and the website was working very ...
0
votes
0answers
64 views

How to improve performance of Nginx for high PHP processing load?

I wonder how I could improve the performance of my server? It is configured with Ubuntu 18.04 (LTS), 4 GB RAM, 100 GB SSD, 2 CPU, with Nginx 1.14.0 and PHP 7.2-fpm to handle running and serving a site ...
3
votes
1answer
283 views

High CPU Load and High I/O wait time : Mysql process

i am fairly new to the role and the technology. we have a Network server that receives the telemetry data from sensors and temeletry data is stored in MYSQL dabatase. we have a front end portal which ...
8
votes
3answers
633 views

How to tune TCP for high-frequency connections between two nodes

I've been scratching my head for the past few days, trying to come up with a solution for the following problem: In our data center we have a F5 running on BigIP hardware that acts as a single ...
1
vote
2answers
155 views

How to make high availability web page? [closed]

When we need a high availability service (it doesn't meter what kind of service: it can be a database, a queue system, our application) we spread it info many machines to make sure when one machine is ...
0
votes
1answer
60 views

Is it considered “safe” to run a task with high I/O on a server for 3 days straight, or would you add pauses in it?

I want to hash the contents of 4 million JPEG files taking up 32TB of a 48TB RAID6 partition in CentOS 7. It's a Hetzner SX131 10 x 6TB box. Having run a test on 10,000 files I think the full job is ...
0
votes
1answer
28 views

Load is 4000, CPU flatlined, remote reboot does nothing

I have a Debian 9 server and the load is over 4000. "top" claims there are 18,132 processes sleeping. Initially, I saw many "ps" processes, hundreds, so I killed them all by name. I don't see any ...
1
vote
1answer
63 views

How do I know if my linux server can't keep up with network traffic and what to do about it?

Suppose I have a web-server serving html-pages under high load. Let's assume that for some reason the bottleneck is not cpu, not ram and not disk but rather the network itself. How can I tell that a ...
1
vote
0answers
666 views

Wordpress Cause Too Many Child Process and Very High CPU Load

I have a WordPress site with daily 25K visitor, +3K post and +22K comment. on a VPS with 2 CPU and 8 GB Ram with SSD disk, Centos installed. it was stable but from 20 days I found a very high CPU load ...
0
votes
0answers
36 views

Need to correlate ps and load average

Let's say that I have 4 CPUs. In that case, load average should not go beyond 4 for better performance, it means only 4 threads can be run at a time (i.e., only 4 should be in R status in ps output). ...
-1
votes
1answer
135 views

LAMP stack with AWS performance [duplicate]

I am planning to move my LAMP stack to AWS as the number of users increases. Current estimations suggest, that the Server has to handle roughly 100.000 users accessing the static landing page, out of ...
0
votes
1answer
580 views

Testing Concurrent Users using Jmeter

If I have to load test an app for 40,000 users per hour with each user's average spent time of one minute then what should be my test approach? Will running a test for 666 Threads/Users (40000/60=...
0
votes
1answer
365 views

NGINX + PHP-FPM issues with burst requests

I have NGINX setup with PHP7.2-FPM and am having issues with burst requests. The average amount of active processes (fpm children) is 15. I have these settings (48 core server): listen.backlog = ...
0
votes
0answers
20 views

Are Load Spikes During Setup Considered for Provisioning?

I have a developer running automated tests which spike above 50% during setup, as seen in the below image. He is arguing that the tests are unstable and difficult to troubleshoot, so downsizing is an ...
1
vote
2answers
6k views

mysqld taking 800% CPU since traffic increased on my site, how to fix

i have centos 7 x64 64 GB RAM and 500 GB of SSD dedicated server., And recently cpu usage was really high, $ uptime 13:50:30 up 169 days, 1:53, 1 user, load average: 37.48, 37.64, 33.60 so i ...
0
votes
1answer
34 views

VServer shutdown on high cpu load - normal?

I rented a VServer to perform some distributed computation tasks. Unfortunately I had to notice that after some minutes of almost full cpu load my vserver shut down. I also got an email, notifying me,...
1
vote
1answer
3k views

NGINX: Request Limit timeout behavior for queries in the queue (burst)

Currently, we have a queue size of 3000 requests. location /api/v2 { limit_req zone=bursted burst=3000; include /etc/nginx/proxy.conf; } The rate limit is 10 requests per second. ...
0
votes
0answers
96 views

Optimizing nginx with SSL for bot traffic without sessions

The service I run, cronitor.io, has a telemetry collection API that sees bursts of traffic around 1000rps. (overall baseline is much lower, call it 100rps) Most of our requests come from things like ...
0
votes
1answer
3k views

Server load handling : One single batch request vs multiple requests

I was talking to a developer about different apis for create, update and delete and he was saying that it was better to have a single batch request to server to do operations like create, update and ...
0
votes
0answers
44 views

How to migrate an established HTTPS-session from one server to another?

There are many HTTPS-servers (Nginx or Haproxy or something else?): single balancer, and multiple workers. Is it possible to migrate an established HTTPS session (with HTTP request headers already ...
-1
votes
2answers
82 views

server average load exact formula

I was in assumption cpu average load is calculated depend on number of process in running state (R state) + process waiting for I/O ( D state). But today I noticed that server is showing high load ...
5
votes
2answers
5k views

Fast pinging without requiring the response [closed]

I am trying to measure one way latency between two machines and I would like to use ping to send ICMP packets from one machine to another. The interval between the packets should be 1 micro second (...
0
votes
0answers
19 views

How high can server load be before sendmail would not be able to function anymore [duplicate]

I have a virtual server that runs multiple VPS on it, when we backup to a usb external hard drive the load increases to about 10 on the mail server with sendmail we get this in the log file rejecting ...
0
votes
3answers
8k views

High load average, when should I be worried? [duplicate]

I have a server which runs a few hundred processes simultaneously, most of them are idle, it is some sort of web crawler it sleeps between requests for various reasons. So as a result, my load ...
5
votes
1answer
948 views

How does a typical http(s) load balancer work?

I know that there are some situations that we encounter heavy http(s) load on a server and we should use a load balancer to distribute load among several back-end servers. But I've a confusion here! ...
0
votes
1answer
675 views

Very high load average results in server lag

We have a CentOS 6.9 server, with 4 core CPU and 32GB RAM. Everyday at around the same time the load average gradually changes from 0.0 upto 11 when we finally have to restart the server. CPU: ...
0
votes
0answers
499 views

Linux Instance running Apache high System Load while low CPU and memory usage

I am running an Apache web server on AWS EC2 (c4.xlarge). My site's peak hour is during 8pm - 10pm. For some reason, during the peak hour, the system load just goes off to the roof, while CPU and ...
1
vote
1answer
2k views

Very High CPU load Low to Medium RAM usage on VPS (mysql over 100% CPU)

I'm on a VPS Virtuozzo server with: 8GB RAM 6 CPU SSD Hard Drive Debian 8.8 PHP 5.6.30 MySQL 5.5.55 There only one website that is served. Its a wordpress with SSL enabled website with around 22000 ...
2
votes
0answers
207 views

How come website be random slow? Open sleep processes?

My website is randomly very slow by high MYSQL CPU, and I have no idea what the problem is. Hopefully I will come closer to the solution with this post. If I check the mysql processes, I see a lot of ...
0
votes
3answers
623 views

e2fsck takes lot of time to run

I am running e2fsck on one of my disk partitions (ext4) but it seems to take eternity. It is already running now for almost 10 hours or so and it is still at 42%. The size of the partition is around ...
1
vote
0answers
46 views

Unexplained load on linux vm - not processor, disk io / disk sleep

I have a 2 processor server with Centos7 that's showing unexplained bursty load. top, htop report matching load averages to the graph below but processes do not show up any matching load. No Ds in the ...
5
votes
3answers
5k views

High CPU usage without useful information from top command

Over the past 2 days I started having problems with a server which has a few users on it. The server is an OpenVZ VPS. Normally when I experience high CPU usage, I always use top command to find out ...
0
votes
1answer
278 views

High load and ram usage on rackspace server

Running an 8 GB General Purpose v1 Ubuntu / NGINX server on Rackspace and received notification average load was reaching near its peak. Ram usage is also high. We have multiple sites running on ...
1
vote
1answer
112 views

Varnish load balancing - does all data flow through varnish making it a bottleneck

When using varnish as a load balancing server, does all data flow through the single varnish load balancer thus bottlenecked by upload speed on well optimized websites serving thousands concurrent ...
-1
votes
1answer
191 views

Server with very high load

I have a problem with my server, which hosts several sites with circa 400 concurrent visits at peak time. The problem is that every few hours the load of the server gets very high for a minute or so, ...
2
votes
2answers
2k views

FreeBSD shows high load, cannot find bottleneck

So we have set up a server(11.0-RELEASE-p2) that hosts around 150-200 jails. The server has 24 cores and 192gb of ram. When using top it shows no sign of stress - except the high load. All jails ...
0
votes
2answers
543 views

CPU usage spikes when calling website

I have a quick question for something I couldn't find while searching. I'm a total server noob so please don't get angry. When I track CPU usage using ssh top I can the user process causing about 20 ...

1
2 3 4 5