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0
votes
0answers
52 views

Dual core CPUs stall with Docker on Ubuntu Linux

I have seen performance degradation after half an hour to one hour with machines running Celery (Django/Python), or Storm under Docker containers with Ubuntu base on Dual-core CPUs on AWS. I see ...
1
vote
1answer
140 views

difference between taskset and cpuset

I'm trying to reduce the latency of my linux network application. I've learned that there are two tools for "binding" a program to particular CPU core: taskset and cpuset. Which one should I prefer? ...
0
votes
2answers
276 views

Get processes running on a specific CPU core

mpstat -P ALL shows high %wa time on a single core from an 8 core CPU and I'm trying to figure out what's writing to disk. So how can I figure out what is running on that CPU core?
0
votes
1answer
115 views

Taskset not working properly in OpenVZ container

In a Debian OpenVZ container, I'm trying to use taskset to pin a process to a core, but it doesn't work: root@foo:/# taskset -c -p 0 1754 pid 1754's current affinity list: 0-7 pid 1754's new affinity ...
4
votes
6answers
481 views

When is it time to add more cores to your virtual server? [closed]

I have a Linux (RHEL 5.8) server with Java 7 and Tomcat 7. The performance is poor, and I am pretty sure it's the DB queries that are slow. We have 2 cores right now, and load average never exceeds ...
1
vote
0answers
298 views

Does installing more CPUs (Intel) than indicated by “Max CPU Configuration” prevent all cores from being used?

I am looking at a server that has 4 physical processors, the Intel documentation indicates they are 6 core processors but this WMI query WMIC CPU Get NumberOfCores, NumberOfLogicalProcessors ...
1
vote
4answers
194 views

Why is it so hard to get servers with Lot of Ram, but few cores?

SQL server has a very high per core license cost, but for a lot of workloads benefits more from lots of RAM. his is now even more of the case with in-memory tables. Even if a server with 4 cores ...
0
votes
4answers
109 views

Does using all cores reduce efficiency?

I have a program (well, php script) which does some pretty heavy text searching - it loads a 2mb and 40mb file and searches through them to find where each word that appears in the first is present in ...
0
votes
1answer
121 views

Windows Server 2012 - CPU utilization

I have Windows Server 2012 machine which has 32 cores. In Task Manager, it shows 32 cores and 64 logical processors, because of hyperthreading. My CPU utilization is in the screenshot below: Can ...
-1
votes
1answer
139 views

How strongly does the number of processors influence on the performance? [closed]

I use Windows Server 2008 R2 with Hyper-V. I can increase the number of processors in Hyper-V settings (http://www.youtube.com/watch?v=NQCMT-O6bMM). How strongly it will increase the performance? ...
-1
votes
1answer
130 views

Can I improve speed in Hyper-V?

I use Windows Server 2008 R2 (it is host) with Hyper-V and a guest running Ubuntu 12.04 LTC. It is my settings: RAM 32768 Cores (virtual processes) 4. (I need 12) I also use virtual hard drive ...
1
vote
1answer
80 views

Acceptable linux load - count HT cores?

So the conventional notion of "acceptable load" on a *nix based box is "1.00 minus some overhead (10% give or take) per core". So if we have a 4 core machine, a load of 3.50 would be acceptable. ...
0
votes
2answers
1k views

VMware - Can a 1 vCPU VM use more than 1 physical core at the same time?

Assume I have a physical ESX host with ONE quad-core processor and hyper-threading disabled. This means it has a total of 4 physical cores or pCPUs. I create a single VM on this VMware host. I assign ...
1
vote
1answer
135 views

KVM host only using one core out of 8

This KVM host is only running one VM/guest right now, and it is running with -smp 1. Top shows only the first core being active. Is that expected when using -smp1? The guest OS is Windows XP. The ...
0
votes
0answers
132 views

Xen Kernel - Only One Core Showing

So I have a dedicated server running the Xen kernel but for some reason it only shows one core instead of 4? Does that mean that my VPS that is running is only getting access to the 1 core or do they ...
0
votes
3answers
392 views

2 x Dual Core vs 1 x Quad Core Performance

A license restriction limits us to 2 x dual core servers, or one 1 x quad core server. Should we see better performance running 2 x Dual Core servers or 1 x Quad Core? Dual Core processors are ...
1
vote
1answer
712 views

MySQL MyISAM multi-core optimization

I've noticed that our app does not respond to requests when a demanding request is in execution. Running top seems to identify the source of the problem: top - 13:54:25 up 1 day, 13:43, 2 users, ...
-1
votes
2answers
72 views

Multi-CPU server with CPUs of differing core counts

Is it possible to have a multi-CPU server where the CPUs do not necessarily have the same number of core counts? For example, a group of 4 at dual core and a group of four at quad core? This ...
-1
votes
1answer
30 views

Tracking down high CPU core utilisation

I have a system with 24 cores and for some reason only the first core is at 100% utilisation while the others are in the range of 20-25%. I would like to get all processes that are running on the ...
0
votes
0answers
31 views

How to troubleshoot the performance difference between two multicore systems?

We have two servers that are very similar configurations, but when running the same custom in-house application, the performance numbers are substantially different. Here are the server specs ...
1
vote
3answers
4k views

Execute curl requests in parallel in bash

What is the best way to execute 5 curl requests in parallel from a bash script? I can't run them in serial for performance reasons.
2
votes
2answers
2k views

Is there a limitations to the number of cores on Windows 7 64 operating system?

Is there a limitation to the number of cores a Windows 7 64 bit operating system can support? I am planning to use that as render server. Rendering software is truly multi-threaded. I am getting a 32 ...
0
votes
3answers
293 views

Linux: One cpu core is always in 0 use

Today I notice a very strange thing. One cpu core is always in 0 use . Is it a bug? Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi,100.0%si, 0.0%st Cpu1 : 37.7%us, 44.4%sy, 0.0%ni, ...
1
vote
1answer
481 views

Quad Core but Single Core on task manager

ACPI Multiprocessor -> Check 4 Processor shown on Device Manager -> Check 4 Processor shown on Task Manager -> Nope OS -> Windows 2003 Enterprise 32Bit Should I see four processers on the Task ...
1
vote
1answer
602 views

AIX CPU Utilization behavior

We are facing a strange (for us) situation regarding the CPU utilization management. We have an lpar with 2 up to 4 online cores. While the application workload peaks, CPU usage is 100% (70% user + ...
0
votes
0answers
274 views

Why does CentOS Linux use cpu/core #1 so much more in a 4-core system?

I've been watching top and htop for awhile on a very active server and I am wondering why linux does not automatically use cpu affinity better? CPU #1 (actually core #1 of 4) is used much more ...
4
votes
1answer
878 views

Difference between Processors and CPU core

can any one please clarify the difference between actual no of processors and CPU cores. in my case i am having Intel Xeon® Processor E5620 as per intels product page: its having # of Cores 4 # of ...
1
vote
0answers
275 views

making use of multiple cores with autobench/httperf

I would like to benchmark a powerfull webcluster with autobench. The problem is that autobench (which uses httperf) can only use one core, thus limiting the amount of load that a client can put on the ...
0
votes
4answers
751 views

Web- and DB-Server: High clock rate and less cores vs. less clock rate and many cores

I am currently looking into setting up a new infrastructure for a hosting project of mine. Basically it will be managed hosting with a strong focus on Django-based apps. All will be Linux-based of ...
1
vote
1answer
203 views

How to change naming of core dumps in unix-like operating systems?

I want to change naming of core dumps for a separate process and its childs or, if it is impossible, for all processes of a separate user. NOTE: I know that it is possible to change the naming for ...
6
votes
4answers
867 views

Will a database server perform better running on 2 CPUs with 16 cores or 4 CPUs with 8 cores?

What I have: an online financial application (ASP.NET, C#) at peak we have 5K+ simultaneous users backend is running on Oracle 11g (active server + stand-by using Active Data Guard). At peak - 4K-5K ...
2
votes
4answers
432 views

Should I expect a great increase in Oracle performance in terms of handling multiple requests switching from single to dual core?

We have an Oracle database of roughly 100 GB that runs on top of a Windows Server 2k3R2 VM in ESX in a 1 socket, 1 core configuration. Whenever it has to handle a major query it seems to get "pegged" ...
1
vote
1answer
1k views

Nginx worker_processes and multi core cpu's - Do Hyper-threading cores count?

Quite often, when reading about the recommended worker_processes for nginx it is stated that this should be set to the numbers of cores the server hosting nginx has. We were wondering if we should ...
-4
votes
1answer
130 views

Hyperthreading can only create two threads? [closed]

HyperThreading can only create two cores/threads ? More can not be created by design or is there any other limitation ?
0
votes
1answer
206 views

On Multiple Processors sytem, System load is high while most of CPUS are idle

See the following output of "top". Any idea? top - 17:33:25 up 7 days, 28 min, 4 users, load average: 12.04, 8.35, 6.30 Tasks: 477 total, 2 running, 474 sleeping, 0 stopped, 1 zombie Cpu0 ...
2
votes
1answer
396 views

CPU Throttling on Opteron 6272 in Windows

I'm in the process of attempting to benchmark a multithreaded application on my new HP Proliant Server which has an 2x Opteron 6272 and 64gb of ram. When I run the application on a desktop machine (a ...
-4
votes
2answers
188 views

Windows 2003 Server and Core2Duo processor features [closed]

I use my computer for development (ASP.NET 4.0/MS SQL Server 2008). I want to install Windows 2003 Server. But I want to know does Windows 2003 Server recognizes and utilizes full features of Core2Duo ...
1
vote
2answers
1k views

VMware ESXi Virtual Machine configuration for hyperthreading

I have a Xeon E3-1230 processor, which has 4 physical cores, but has hyperthreading so an operating system running on it sees 8 logical cores. I installed VMware ESXi and am creating virtual machines ...
1
vote
2answers
98 views

Assigning cores to VM in vSphere

Complete vSphere newbie here... Background: So, I have a 12 core machine with 24 VMs on it. Currently, all the processing power is shared between these VMs equally. The question: Can I configure ...
1
vote
1answer
57 views

Deactivating Cores option in SQL Server 2008

What is actually the difference between deactivating 2 of the cores as in this screenshot and having a dual core machine I guess is not the same as having a dual core machine, right? Do you know ...
1
vote
2answers
1k views

Will all cores be used on an i7 when running SQL Server 2008 R2 Standard

I have a server with an Intel Core i7 processor (4 cores). If I view processor activity in Task Manager I see that there are 8 cores. I believe that this is because of hyperthreading (please correct ...
1
vote
3answers
365 views

How can I run command and select core to be used

I have a command to run (in this case is a php5 script) and I would like to know if there is something to run this command and select the core to be runed. What I want to do is to run 1 command per ...
0
votes
4answers
1k views

How to force a process to run on a particular cpu?

I know that taskset can be used to force a process to run on a particular cpu. How can I force tomcat to run on a particular CPU? I then want to run apache bench on a seperate CPU. Update I ...
-3
votes
3answers
384 views

Why do I need six cores in a cpu for a server? [closed]

I was getting specs for dell server and one cpu is an Intel Xeon with 6 cores, another 4 cores. What am I getting with this? Do I need six cores? What does that give me? I don't know what ...
0
votes
1answer
546 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 ...
1
vote
2answers
622 views

Hyperthreading on multicore processors - is it of any use? [closed]

I know hyperthreading from the time long ago where the processors used to have only a single core. The technology was really usefull then. Right now, Intel is still offering hyperthreading with 6-core ...
3
votes
2answers
147 views

Performance implications of CPU/cores ratio

With the recent widespread adoption of multi-core CPUs, a question comes to mind: how does CPU/cores ratio relate to performance? Which of these is better, how and why? 1 8-core CPU 2 4-core CPUs 4 ...
3
votes
5answers
975 views

How can I move a process to a core or dedicate a process to a processor?

I have an Intel E5620 processor. I have used cat /proc/[pid]/stat to determine what processor the process was last run on (39th field). How can I ensure that a process is dedicated to a processor (I ...
1
vote
3answers
5k views

Setting up Apache to use multiple cores

Recently I have purchased a 6 core server which is running Ubuntu 10.04 and Apache. How do you set up apache to use all 6 cores and what is the best practice to do this? Is it possible and if it is ...
7
votes
1answer
5k views

MySQL and Multi-Core processors

I'm running MySQL on win2008 server on a multi-core xeon processor. It looks like it only uses a single core. Is there something I need to configure to make it use all cores ? The server is ...