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Questions tagged [concurrency]

57 questions
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3 answers

Is NFS capable of preserving order of operations?

I have a diskless host 'A', that has a directory NFS mounted on server 'B'. A process on A writes to two files F1 and F2 in that directory, and a process on B monitors these files for changes. Assume that B polls for changes faster than A is…
JustJeff
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SQLite WAL concurrent write performance on UNIX systems

I have two setups: one runs on windows 10 (ntfs partition), the other on debian (ext4 partition). The R source code is the same. The main process starts 8 child-processes (P-SOCKS) -- on 8 vcores -- which all query and write to the same WAL enabled…
Davor Josipovic
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How to allow concurrent execution of job arrays with job share (-js)

I'm trying to have SGE run job array tasks concurrently based on the job shares parameter of qsub but it seems not to be working as expected. Is there a way to enable concurrent task execution based on shares? I have a script which sleeps to…
a1an
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Does the maximum amount of open descriptors in a server include it's children?

I know that Linux limits the maximum amount of open descriptors, usually to 1024. Now say I need to create a server which will handle more than 1024 users, 2000 for example, without tampering with the kernel. This means I couldn't handle all of them…
Cuaox
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Tips on technology for one program, many concurrent http clients on small host?

What technology could be used for one application to serve many simultaneous users on a small resource-constrained host (eg: Rasbperry Pi or similar)? That is, it doesn't need a general purpose web server like Apache, as it would only need to…
Zeph
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Is it advised to close MySQL connection after every query

I have some sort of web crawler with PHP, which crawls the web and stores information about the pages in the database, now the thing is, loading pages takes a lot of time, and on top of that my script sleeps up to 5 seconds between each request,…
AL-Kateb
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Apache delays serving an empty html file while processing a concurrent request

I have a website, which queries a Varnish server, which queries an Apache server, which queries a db server. At 07:00:00, a request is send to the Apache server, which triggers a db request that takes over 30 seconds to process. While the db server…
Elvex
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Server is not responding when single connection is blocked

I'm not sure how to properly specify this problem, I'm not really a server expert. I will be glad to provide additional data on demand. I have a PHP web-application running on Ubuntu Server with nginx and PHP-FPM (communicating via socket file).…
Slava Fomin II
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Excel 2013 Power Pivot RemoteApp - limited by 4 concurrent users?

We're trying to use Excel 2013 (64bit) + Power Pivot via RemoteApp. The problem we're having is basically the same as described this TechNet thread. 4 concurrent users have no problem using Power Pivot, the 5th person gets this error: "Couldn't load…
Blaž Dakskobler
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xmpp openfire connection manager not working

I have downloaded the connection manager here .In windows I have extracted it to program files in C drive and edit the conf/manager.xml to set domain and password. I also enabled connection manager in openfire management console. Now If I run…
Prabhu M
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Apache httpd response time increase with concurrent connections

I know many questions have been asked on this subject, but I didn't find an answer to help me. I'm trying to have Apache httpd answer 200 concurrent connections. I'm testing with jMeter, fetching a small static text file (about 100 bytes), using…
greg
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Ask nginx to handle requests from the same IP in parallel?

I have an application internal to my company that needs to be very fast per client, because the clients are so limited and the whole thing is internal. So, the client is expected to send so many concurrent requests and what I want nginx to do is…
OmarOthman
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iSCSI and NFS file locking and concurrency

I've got a linux host that need to mount a data share located on a NAS. The choice is between NFS v3 (NAS limitation) and iSCSI. The initial idea was to have a NFS mount to the file server that provide the samba mount points to the rest of the…
Vinnie
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Optimizing Apache for large concurrent requests and static files

OK, I know I'm asking a question that's been asked multiple times before (e.g. here - Serve millions of concurrent connections and static files?) but there appears to be no concrete solutions, so I would like to ask again; please be patient with…
Suman
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What framework is good for delivering data that is commonly changed in a few second and is assessed by lots of people (similar to stock quote)?

I am only familiar with php and javascript and I guess php is not good at serving large amount of concurrent request. I would be grateful if someone can introduce me to more appropriate framework for that, as I don't really know the keyword to…
StCee
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