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0
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0answers
39 views

Install amphp / thread on a Debian Wheezy 64 bits

I'm trying to install a multi-thread PHP system on one of my server. After a few readings, the simplest solution seems to use Pthreads with an Amp\thread implementation ...
0
votes
1answer
154 views

uWSGI raises segfaults when defining several mount points in preforking+threaded mode

I'm hosting an application consisting of several Python modules. So far we use Apache in MPM worker mode and mod_wsgi, which is a working environment. Now we want to check if nginx + uwsgi may be a ...
0
votes
0answers
114 views

Maintaining a progress counter across multiple PHP worker threads using Gearman

I've set up an Amazon EC2 instance running Gearman and 10 worker threads written in PHP. I'm also utilising MySQL and Redis. For each user that signs up to my website up to 1,000 Gearman jobs are ...
2
votes
1answer
1k views

Taskset not working over a range of cores in isolcpus

To preface I'm using Debian Wheezy with kernel 3.2 on an AMD64 chipset. My machine has two Xeon E5-2690 cores. I set up the boot parameters so that all the cores on one CPU are dedicated to a single ...
2
votes
2answers
221 views

SSH multiple TCP connections for single transfer

I'm trying to backup a huge tar archive (150GB) from a root server (Debian Wheezy) to my local storage server (Cygwin). Speedtests with the root server give me about 100 - 120 MB/s download rate and ...
12
votes
1answer
934 views

Why do we get a sudden spike in response times?

We have an API that is implemented using ServiceStack which is hosted in IIS. While performing load testing of the API we discovered that the response times are good but that they deteriorate rapidly ...
-2
votes
1answer
261 views

Check if mysql is using multithreading?

When I check the processes/active tasks on centos using the top command, when using SSH. I only see 1 mysql process. Does this mean that it is only using one cpu core out of my 4 cpu cores?
0
votes
1answer
581 views

Django mutli-threading on apache/mod_wsgi/windows

I am quite new to the combination of apache and django and quite naive frankly regarding to how multi-threading is handeled. Specifically I run on a windows server, so I know the MPM is only ...
2
votes
2answers
114 views

Linux: Finding the system processes which are at the top

I am running a multithreaded program on my 8-core processor. top command shows 8 processes are running and each one utilizes a core by 100%. The problem is that only 21% are marked as user cpu and my ...
1
vote
2answers
65 views

redmine multitheaded

Our redmine server is not responding due to connecting it to a large repository. It has not crashed but it's just busy until it checks it out, or whatever redmine does when you set a new repo for a ...
3
votes
1answer
195 views

How does Apache process several requests at a time?

If 10 requests hit Apache, does it process them one by one, so when R3 finishes, then it starts to run R4, or does it fire 10 processes/threads/whatever and are resolved simultaneously? Now some ...
2
votes
1answer
115 views

Python multithreading not working on VPS server

I am running an python multithreaded application with multiple processes which scrapes data from some websites. While running on my localhost It works great, but on the vps server I am using( Centos ...
0
votes
1answer
1k views

Single-threaded application being balanced across CPU cores?

Is there an easy way to check whether a certain single-threaded application is being balanced across CPU cores by Windows? I have already tried Process Explorer but I could not find a way to read it ...
1
vote
1answer
116 views

Confusion about PHP Non-Thread safe

PHP 5.1.6 - Non-Thread Safe ( Thread Safety=disabled in phpinfo() ) Apache 2.2.3 - MPM prefork Should I be using prefork or worker? If so is this an easy switch?
1
vote
1answer
623 views

Poor SSL performance with vsftpd

I'm trying to tweak vsftpd to achieve maximum performance for my usage: I have only one or two clients that connect to the server. File size is between ~15MB and 1GB. Typical transfer batch ...
1
vote
2answers
2k views

Linux Scheduler (not using all cores on multi-core machine) RHEL6

I'm seeing strange behavior on one of my servers (running RHEL 6). There seems to be something wrong with the scheduler. Here's the test program I'm using: #include <stdio.h> #include ...
-1
votes
3answers
627 views

613 threads limit on debian [closed]

When running this program thread-limit.c on my dedicated debian server, the output says that my system can't create more than around 600 threads. I need to create more threads, and fix my system ...
0
votes
1answer
557 views

Tomcat performing terribly for no apparent reason

We're running a game application .WAR on Tomcat 6 on an Amazon EC2 server, 8 core processor, 7gb RAM. The application uses a MySQL database hosted on Amazon RDS. This Facebook application takes ages ...
4
votes
4answers
2k views

Running multiple scp threads simultaneously

Running multiple scp threads simultaneously: Background: I'm often finding myself mirroring a set of server files a lot, and included in these server files are thousands of little 1kb-3kb files. All ...
1
vote
1answer
235 views

Java doesn't seem to utilize more than two cpus

In my current setup (debian squeeze x64, 6 cpus) neither java nor apache seem to utilitze the full potential of the server. The munin monitoring shows cpu usage never exceeds the 200% mark. We ran ...
4
votes
2answers
1k views

Renice: How to change all threads?

When I renice a multithreaded process in Ubuntu 10.04, then view the results in top, it seems that only the main thread actually gets reniced. All the other threads retain their old nice value. ...
1
vote
3answers
1k views

Do Nginx performe better on Linux compared to Apache?

Apache vs Nginx are compared performance wise since Apache is based on threads (for each new connection a new thread) and nginx is based on process (for each new connection to the server a new ...
1
vote
1answer
934 views

Why my server has a lot of mysql threads?

I noticed my server is consuming almost 500 MB of RAM, with 19 threads started, as shown in the following image. MYSQL Threads top image: http://i.stack.imgur.com/5CakQ.jpg Here is the ...
4
votes
3answers
2k views

taskset core numbers question

I have quad core CPU with hyper threading enabled. So I have 8 logical cores. I want to limit my application to use only 4 cores and I want this 4 cores to be different physical cores. Which taskset ...
0
votes
2answers
1k views

Copy large amount of small files using robocopy from USB disk to SATA disk

Would specifying the /MT option in robocopy give me better or worse performance, when copying a large amount of smaller files (~10-150kB) from an USB attached drive to an internal SATA drive? Should I ...
6
votes
2answers
1k views

Why /proc/cpuinfo shows different flags for cores on the same cpu?

cat /proc/cpuinfo on my system gives me different flags for my 2 cores. Can someone explains to me why? I'm running Ubuntu 10.10 kernel 2.6.35-24-generic. processor : 0 vendor_id : ...
0
votes
1answer
656 views

Issue with maxWorkerThreads and thread count

I have created an ASP.net application which creates thread in infinite loop. And set maxWorkerThreads to 20 in processmodel in machine.config. When i checked Thread count in perfmon there was around ...
1
vote
3answers
441 views

32 core multithreading performance for ASP.NET 4.0 and MS SQL 2008 Web Edition

Recently my user count has increased and my current server has started to become insufficient. I am thinking about buying 4 x 8 = 32 core AMD CPUs using dedicated server. I wonder how good ASP.NET ...
0
votes
2answers
695 views

Apache2 MPM-prefork MPM-worker multiple instances on same Ubuntu host machine possible?

I have a live Apache2/MPM-Worker instance running Django. I want to also run an Apache2/MPM-prefork instance to run some Drupal6 applications on the same host machine and utilize a vast selection of ...
2
votes
3answers
394 views

Threading of PGP Whole Disk Encryption on server

I wish to use a 2010 vintage quad core Xeon server to periodically encrypt 500GB eSATA drives. I have three questions: 1) I assume the current version of WDE is fully multi-threaded and throughput ...
0
votes
2answers
263 views

identical load balanced VM's on same host

If I have a VM (either KVM or ESXi) serving static content on Apache and a video streaming webapp on Tomcat, is there a logic in running multiple instances on the same VM on the same piece of kit and ...
0
votes
1answer
132 views

Does Sql Server Database Mail use threads while sending mail?

We are using Sql Server 2008 Database Mails to send emails to our website visitors. I don't know whether Sql Server sends mail one by one by picking up from the queue or it will use threads to send ...
5
votes
4answers
555 views

Does SQL Server Database Mail use threads while sending mail?

We are using SQL Server 2008 Database Mail to send emails to our website visitors. I don't know whether SQL Server sends mail one by one by picking up from the queue or it will use threads to send ...
0
votes
3answers
576 views

Emulate a SMP server with a Linux Cluster?

Is it possible to combine a few machines into a cluster and have it appears as a single server? For example, with such a cluster we can run a 32-thread CPU-bound process on 8 quad-core machines. Are ...
0
votes
1answer
256 views

Limit a process's relative (not absolute) processor consumption in Linux

What is the standard way in Linux to enforce a system policy to limit the relative CPU use of a single process? That is, on a quad-core machine, I never want a process to use more than 2 CPUs at once, ...
1
vote
4answers
2k views

What causes Context Switching on Windows?

On Linux context switching can occur because an application makes a system call, or because the scheduler swaps processes out of the CPU for another process. On Windows what are the possible causes ...
0
votes
1answer
124 views

Is an IIS-Spawned Process CPU-Limited?

Seems more appropriate here than at StackOverflow; we'll see if it gets closed. Let's say I have an IIS App Pool set to cap at 25%. But the pool runs a webservice which spawns a process. Is that ...
0
votes
3answers
4k views

Max # of threads per CPU

I'm currently using Visual Studio Test Suite load tester to simulate a load against on of our web apps on a different server. (No, I'm not testing against production). I believe it is creating a ...
8
votes
2answers
5k views

Is it possible to limit a Linux process so that it can only run on a particular core on a particular machine?

Let's say I have a quad-core box and four identical processes, each with ten threads. Is it possible, in Linux, to say that Process A is only allowed to run on CPU 0, Process B is only allowed to run ...
0
votes
2answers
2k views

CPU Utilization of a multithreaded process

Background: I have a whole mess of systems running the 2.6.20 and 2.6.22 kernel in what started as a Fedora Core 2 install several years ago. These systems have 8 cpus, as reported by cat ...