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Questions tagged [bottleneck]

A bottleneck is the place where transmission is the slowest.

A bottleneck can best be described as the slowest working component in a machine. Suggest you have a computer with 100 super fast CPUs, a bit of memory and an old IDE drive. When we start a process that needs to do parse something from a giant file, our bottleneck will be the I/O. Our CPUs will be able to handle the parsing, but not all of them will be used on max capacity because the I/O will not be able to provide the file fast enough.

This is called a bottleneck. The analogy comes from whenever you try to empty a bottle. There is only so much liquid that can get through the bottle opening (bottleneck).

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How can I find the bottle neck?

I have a EC2 m1.large Ubuntu 13.04 Instance runs PHP 5.5, PHP-FPM and NGINX. Cache is handled by Elastic Cache using Redis and the database connects to a separate m1.large MongoDB server. The content can be fairly dynamic as newsfeed can be dynamic…
Jonathan Thurft
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How do I know when server "runs at speed limit"?

Basically I'd like to know if it's possible to speed up my server or not by using caching like squid, checking for possible errors in configuration, optimizing various server software parameters, etc. Is it possible to predict time to serve say 1MB…
Evgeny
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Server hard disk read speed and client download speed, is there a connection?

Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post: Does upload speed depend upon download speed of the server? In other words, the data transfer rate between the two…
Mywiki Witwiki
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Where to look for the bottleneck when download slows down?

Image downloading from our site slows down every evening. Compared to daytime we get %50 more traffic over the evening. In exact figures, during daytime hours, hourly pageview count is around 20k, during evening hours hourly pageview count is around…
Haluk
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Looking for a bottleneck in MySQL server

I have two Ubuntu servers with very similar, if not identical, configuration: both have 16 cores (4 E5540 Xeons), 16GB RAM, HP Smart Array P212 controllers with 2 HDDs in RAID1. I/O scheduler used is deadline. Both run the same versions of MySQL…
minaev
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What could cause processes to not be active

Running linux and executing a bunch of PHP scripts. I noticed that our CPU usage was pretty low but many processes were sleeping, so started investigating. AWS EC2 with an S3 bucket. I can't seem to find any bottleneck but maybe I'm interpreting the…
D.Mill
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sshfs - howto view load and find bottlenecks

I got 2 dirs mounted by sshfs from remove server. And suspect those make my app so slowly (app generate many i/o operations in this). I can use fdisk/iostat/iotop for diagnostic HDDs bottlenecks, but sshfs mounts not shows in this tools. Where can i…
Anton K.
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How to tune Nginx + MySQL + PHP-FPM bottleneck to resolve high server load?

My server, Ubuntu 14.04.4 LTS, is running at high load, currently running a single site with Nginx + Wordpress + W3 Total Cache + Memcached. I'm not sure if mysql is causing the workload issue. Here are the screenshot for htop and mytop I can tell…
KDX
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Copying large file with robocopy during VMWare storage vmotion

if I copy massive files via robocopy during storage vmotion then is there any negative impact ? thanks,
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How to determine the bottleneck of a given network

Consider an Access Point with a packet queue that can hold up to 50 packets and a network whose bottleneck is a link with a datarate of 50 Mbit/s. There are quite a few nodes connecting wirelessly to the Access Point, one of them uploads a file…
user503842
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Do routers and networks have have a “max threads” configuration?

I've been stress testing my application now and I've identified a high average network connection time. This is odd because I haven't gone over the max bandwith at all. What can this be caused by? Have I gone over the "max thread limit" on the…
Sandeep Shan
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