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Questions tagged [high-load]

All aspects of high-loaded systems development and maintenance.

-2
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1answer
42 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
45 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
130 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
374 views

samba high cpu usage

I moved my Debian 9 today to my new Server. Since then, the Samba ussage is at 20%. There are no users active. root@homeserver:/var/log/samba# smbstatus Samba version 4.5.12-Debian PID Username ...
0
votes
0answers
95 views

Nginx/Express vs .netCore

I have a small front-end application that needs serving. Currently I'm doing this via Nginx with a proxy to Express/Node for dynamic content. Nginx for static files, Express for not. My question is,...
0
votes
0answers
15 views

How to identify the last coming request?

I have a system which keeps on accepting request, these request are of same type but for different configurations. Here is the problem: I just want to know the last request which has arrived and ...
0
votes
0answers
17 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
724 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
29 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
1k 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
84 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
695 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
37 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 ...
0
votes
0answers
90 views

IO Latency - Cause or symptom?

Our application (LAMP) worked perfectly at our current VPS provider. Since few weaks ago we are experiencing very high load peaks (80+). We discovered that the CPU and memory are both normal during ...
-1
votes
2answers
75 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
2k 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
2k 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
821 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
330 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
240 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
820 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
137 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
2answers
198 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
33 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
3k 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
174 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
64 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 ...
-2
votes
1answer
142 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
977 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
351 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
votes
2answers
216 views

Why there are so many “ss” process on my server (CentOS with nginx serving the web)?

There are about 500 concurrent users. It's because some famous people on social network repost a link. This happened before. And our server were performing good. But this time, the server is getting ...
5
votes
2answers
3k views

High system interrupt rate

My server has 24 CPU cores, 96G memory, installed CentOS 7.2 x86_64. After starting my program with a large data set, my program will use about 50G memory, and the Linux system will show a high rate ...
0
votes
1answer
59 views

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 ...
0
votes
1answer
65 views

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 ...
0
votes
0answers
108 views

Will the load average of my Linux box increase if it reaches file descriptors or TCP connections limit?

Will the load average of my Linux box increase if it reaches file descriptors or TCP connections limit ?
-1
votes
1answer
85 views

How to upgrade 2 years old server? [closed]

Two years ago I bought a server with the following characteristics: Platform: Supermicro X9SRi-F Motherboard RAM: 8*8GB ECC 2133 DDR4 Reg (64GB) CPU: Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz 10 ...
22
votes
6answers
3k views

Why is response time exploding when request frequency drops?

Correction: response time (%D) is μs not ms! 1 This doesn't change anything about the weirdness of this pattern but it means that it is practically way less devastating. Why is response time ...
0
votes
2answers
566 views

KeepAlive on or off for a server handling almost exclusively a single request per client?

The Apache in question is running on a Ubuntu-EC2 instance. It basically handles about a million requests per hour. Essentially a client will POST a JSON and that's it - so an interaction of a client ...
2
votes
3answers
576 views

How to detect if Apache is (on the verge of) being overwhelmed by requests?

I'm maintaining and planning an EC2 server instance running Apache2 on Ubuntu which receives currently up to about 10000 (very simple) requests per hour. It's just some data coming in by POST and a ...
-1
votes
2answers
64 views

How can I handle heavy Database interaction at peak hours? [duplicate]

We run an application more like competition organizing websites like HackerEarth.com, HackerRank.com. When the tasks start, we see huge load on our server. The problem is, we need to interact with ...
-2
votes
1answer
2k 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 snapshots ...
0
votes
1answer
89 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
46 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 ...
4
votes
0answers
644 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
vote
0answers
182 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 ...
-6
votes
1answer
143 views

How much a typical web request usage of resources can be? [closed]

I have been making my very first web application, and I am using PHP to develop it. I can see my VPS being able to flawlessly handle some decent amount of requests, even though it does few SQL ...
4
votes
1answer
700 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
987 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 ...
5
votes
1answer
219 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. ...