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Questions tagged [multi-threading]

79 questions
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Set number of threads when auto compiling kernel

I use Ubuntu as main operating system. I have found that when a new kernel is included in a system upgrade, during the upgrade, certain kernel-related items are compiled (kernel modules?). During this process, I check that the processor usage is…
Ommadawn
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Handling a deployment in prod with in memory data with uwsgi & kubernetes

I'm in a bit of a bind here and I'm looking for pointers as to how to best manage my situation: So, I have a Flask app with uwsgi and I'm deploying this to Kubernetes with 2 pods. UWSGI configuration is 1 process and 4 threads are we're really…
Saturnian
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NVMe parallel writes

I'm trying to understand better how writing to NVMe can be optimized. I have a process which writes a large amount of data to disk (~100 gb) in one batch job. The data is spread across 100s of files. I have multiple NVMe disks available and will be…
R.Smith
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Synchronizing threads in multithreaded applications

I use the SIESTA dft package on a CentOS 8 (core) system with a 16 core, 32 thread XEON processor with OpenMPI version 4.1.1 for all calculations. Since I have 32 threads, I use 28 of them to do a SIESTA calculation (which consumes a good amount of…
PBH
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Laravel/PHP process on debian 10 only ever using one of two CPU threads

I am running a Debian 10 Buster server on a google VM with PHP 7.3 Apache2 and MySQL 8. On the server, I am running Laravel 8 as an API for two clients. I recently upgraded the VM to an n2-standard-2 (2 vCPUs, 8 GB memory) and wanted to check the…
Mariann
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Intermittent KVM performance issues causing performance glitches

We are currently hosted on a hosting provider that allows us to set up multiple virtual machines using KVM, where each virtual machine runs on it's own physical box (ie: one hypervisor, one VM with all the memory and CPU allocated to it). Recently…
Kendall Bennett
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Memory utilization in Centos OS 6.6 (Virtual and RSS)

My C++11 application run for days without reboot to perform fluid simulation. After running it for 6days, this is the memory footprint: RSS 54MB VSZ 5.6GB Why virtual memory increased to 5.6GB? There is no memory leak in my application. Application…
user3059007
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HAProxy uniform balancing between processes

We using nbproc 10 for multiprocess HAProxy. Server with Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz. In config: nbproc 10 cpu-map 1 0 cpu-map 2 1 cpu-map 3 2 cpu-map 4 3 cpu-map 5 4 cpu-map 6 5 cpu-map 7 6 cpu-map 8 7 cpu-map 9 8 …
artful
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Can Apache HTTP server work as thread-per-request?

I'm trying to fully understand the differences between Apache and Nginx. I've come across the concepts of thread-per-connection and thread-per-request. Then, I've also learned about Apache's MPMs. From my understanding, using mpm_prefork, Apache…
garci560
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windows server 2012 cpu quota

I have written a multi-threaded program that is running on Windows server 2012. The program will create threads to take advantage of multiple CPUs and I can control the number of simultaneous threads it will create. Each thread will normally use…
shindigo
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run command on multiple threads

I am running a command (pngquant to be precise: https://github.com/pornel/pngquant) in a terminal window. I noticed, that if I open 4 terminal windows, and run pngquant command in each of them, I get 4x speed increase, effectively compression 4…
sanjihan
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Syslog-NG is spooling messages

I am currently using Balabit's Syslog-NG to concentrate my IT logs and convey them in a remote server, via a TCP connection, which can allow one listening port only. Thing is, my log volume is really important (about 15,000 messages/sec), and I can…
moutonjr
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Virtual machines and dual socket setups: minimizing need for CPU-to-CPU communication

I am planning to build a multi-OS workstation overseen by (probably) KVM, on which I will do a variety of tasks. Some of these tasks lend themselves to multithreading better than others, so I want to maximize clock speed as much as possible. To this…
Stonecraft
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Why robocopy with multi-treading copies faster

I have been using robocopy with the switch MT and really makes a difference in coping time. I would like to know why the CPU treads act as a bottle-neck while copying files or what makes robocopy with multi-treading copy faster.
kimo pryvt
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Application GUI on a heavy load tomcat doesn't respond

We have a backend webapp installed on tomcat 8 that has a GUI part written in Apache wicket MVC (version 1.4) - the wicket GUI fails to respond the moment the server starts doing heavy processing. On average the CPU sits around 85% utilization. The…
psyopguy
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