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Questions tagged [high-load]

All aspects of high-loaded systems development and maintenance.

All aspects of high-loaded systems development and maintenance: design, algorithms, architecture, technologies, development, testing, databases, storage, support, hardware, hosting, management.

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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=666) using ramping up period of 1 minutes and…
Cedric
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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 = 1024 pm.max_children = 1024 pm.start_servers =…
user2693017
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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 inappropriate action. Ignoring the obvious…
SeanVDH
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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, that my server was automatically disabled due to…
Art1st
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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 curl and the most popular HTTP libraries in each…
Encoderer
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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 delete than to have multiple requests for each…
Syed Suhail Ahmed
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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 received) from balancer to worker? Balancer…
user2743554
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How high can server load be before sendmail would not be able to function anymore

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 connections on daemon MTA: load average: 10 I…
Sl33py
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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: Spikes sometimes, when processes such as spamd, fail2ban…
NewServerGuy
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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 Memory usage is kinda OK. Also, the number of Apache…
starchx
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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 800Gigs and overall disk size(on which the…
DivKis01
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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 this server so trying to track down if one site is…
Stretch0
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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 percent of CPU load when calling a website that…
Mtm Project
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Is it safe for a server running an http API to have 100% CPU usage?

I have an API (based on php, and connecting to separate mysql database server) that is called lots of times, and the software that is calling it can wait for the result for a long time and it will not call the API before it gets it's result from the…
Sevron
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Apache increasingly eats resources until restarted

My apache2 (Ubuntu 12.04) over some (variable) period of time comes to unusual system resources utilization. I'm positive that I don't have that amount of traffic and dos/ddos are pretty much out of list because no web server restart can do anything…
Miloš Đakonović
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