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16
votes
3answers
5k views

Two Dual Core vs. One Quad Core

For an Intel based system keeping the number of cores constant how much difference would there be between two dual core processors and one quad core processor? We run Oracle OLTP databases on two ...
8
votes
2answers
12k views

Disable CPU cores in bios?

Is it possible to disable CPU (Intel) cores in BIOS, and if yes what HP/DELL (others?) 1U/2U servers would allow this? It is becoming difficult to find new server hardware with dual core CPUs, most ...
7
votes
1answer
4k 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 ...
6
votes
4answers
1k views

need high performance /bin/sort; any suggestions?

Greetings, I'm looking for a high performance /bin/sort drop in replacement. I know there is pbzip2 for using multiple cores, but is there a similar product for /bin/sort? I've found distsort.sh, ...
6
votes
4answers
662 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 ...
5
votes
7answers
39k views

Sun Solaris - Find out number of processors and cores

Our SPARC server is running Sun Solaris 10; I would like to find out the actual number of processors and the number of cores for each processor. The output of psrinfo and prtdiag is ambiguous: ...
4
votes
9answers
2k views

For Intel Core 2 Duo, should I upgrade my x32 with x64 Linux? [closed]

I understand that the Core 2 Duo is a 64-bit processor, while Core Duo is a 32-bit processor. Let me know if my understanding is wrong. My Linux server, with the Core 2 Duo E8400, is currently ...
4
votes
4answers
7k views

Why does my Windows 7 VM running under Linux' KVM not use all the virtual processors?

All I've had a problem on my server since I migrated one of my VM's from Windows 2008 Server to Windows 7 (ultimate): though I've assigned four cores to the VM and it even seems to see them, it seems ...
4
votes
4answers
8k views

Virtualized CPU cores vs. threads

We've got a KVM host system on Ubuntu 9.10 with a newer Quad-core Xeon CPU with hyperthreading. As detailed on Intel's product page, the processor has 4 cores but 8 threads. /proc/cpuinfo and htop ...
4
votes
6answers
371 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 ...
4
votes
2answers
1k views

Xen - Make one guest OS have 2 cpus?

I have inherited a Xen setup. The dom0 and domU's are all linux. dom0 has 8 cores (or CPUs, I'm not sure). We want to run more stuff on one domU. I want to make it a multicore CPU, ie so that the domU ...
4
votes
1answer
727 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 ...
3
votes
5answers
852 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 ...
3
votes
2answers
193 views

Can IIS create threads from GPU cores?

Can IIS be set up to take advantage of new massively multi-core GPU's to provide additional thread for maximum concurrency? My thought is that with technology like the AMD Fusion would it be possible ...
3
votes
1answer
1k views

Many instances of sql express use all the same cpu?

Sql Server Express has the following major hardware limitations that has a consequence on performance: 1 CPU 1GB of memory My question is: if on a multicore machine many instances of sql server ...
3
votes
4answers
606 views

Can Windows be configured to only use a single hardware thread?

Is is possible to configure Windows to only use a single hardware-thread. Every machine for the last couple of years seems to be at least dual-core, but some timing bugs are only reproducible when ...
3
votes
2answers
2k views

top in batch mode, need CPU% for every core

I know that after running top, I can press '1' and get a list of the CPUs with their utilization percentages. I suspect I can do this in batch mode too with the -b option, but I don't know how, and I ...
3
votes
2answers
134 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 ...
2
votes
4answers
2k views

rsync with multi-core server should go faster than it goes. Am I wrong?

I'm launching a rsync simple command between two servers. Both servers have two eth interfaces on bonding. When I send a big file from one server to the other with rsync I reach 130M/s transfer ...
2
votes
3answers
7k views

More RAM or More Cores for a MySQL Database Server?

Here's the scenario, which I'd love your expert advice on: I've got about 2GB of database currently, maybe double that in a year. I want the optimum server performance for the dedicated DB server I'm ...
2
votes
2answers
596 views

How to find out if my debian server setup is a dual core or not?

I have access to root and would like to find out. Thanks
2
votes
2answers
5k views

How to determine actual virtual CPU configuration of ESX image?

We have severe performance issues on an ESX client, but from where I am I cannot directly view the server configuration, yet I want to find out whether they set it up correctly. Running CPU-Z shows ...
2
votes
4answers
351 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" ...
2
votes
1answer
379 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 ...
2
votes
1answer
200 views

Q9650 vs. i7-870 for Server

One of our dedicated machines we use for hosting in London has exceeded the CPU usage, so I contacted the datacenter last week for a quote on an upgrade. We are hosting game servers, and most of these ...
2
votes
1answer
347 views

Are Core 2 Quad CPUs interchangeable with Core 2 Duo?

I have some aging Core 2 Duo systems in need of an upgrade. The motherboard combinations are varied so I'm wondering, in a broad sense, are the Core 2 Duo procs interchangeable for Core 2 Quads or do ...
2
votes
2answers
969 views

Running a VM on a hyperthreaded CPU

Is it better to run a VM on a dual core hyperthreaded machine as a four core or as a two core VM. The hyperthreaded 'virtual' cores are not as fast as the real cores. Does this effect the VM?
2
votes
2answers
932 views

Can I turn off a faulty core temporarily on my CPU?

I have the following CPU: AMD Phenom 9600 Agena 2.3GHz 4 x 512KB L2 Cache 2MB L3 Cache Series Phenom X4 Model HD960ZWCGDBOX Socket AM2+ 95W Quad-Core Processor I'm getting BSODs and an event ...
2
votes
1answer
86 views

VPS Hosting - Mhz vs Core

Not sure if this has been asked, can't find any existing questions. Link me if they exist :) When looking for a VPS, some hosting providers offer X amount of Mhz, while other hosts offer X amount of ...
2
votes
1answer
200 views

PostgreSQL: sweet spot for core count

I have a few questions re. PostgreSQL. What is the sweet spot so far as number of CPU cores goes? Does anyone know when parallel queries will be implemented? WRT #2, I've seen benchmarks where ...
2
votes
1answer
224 views

Format Filename for Process Core Files per Session

Is there a way to change the core filename format per session instead of for the entire machine? On Linux the only way I can find is using sysctl as root: sudo /sbin/sysctl -w ...
2
votes
1answer
811 views

Can Windows 2008 64bit make use of a 6 core cpu?

There's a version of AMD Phenom CPU which is 6 cores. Would Windows 2008 64 bit & SQL Server 2008 64 bit make use of all the cores? Any special settings of the OS or sql server needed to benefit ...
2
votes
1answer
423 views

IIS 7.5 application pool CPU configuration

I have a web application that when runs on windows 2008 r2 data center edition and when the server is configured with a single core processor consumes 13 mb ram, when configured to run on dual core ...
1
vote
2answers
852 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 ...
1
vote
2answers
247 views

Are blade server cores pooled?

Windows server software versions, vary in how many CPU sockets that they support. So if you have a normal server with 4 CPU sockets. If each CPU is a quad core (belive there is talk of 6 or 12 core) ...
1
vote
4answers
158 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 ...
1
vote
3answers
333 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 ...
1
vote
3answers
4k 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 ...
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
1answer
67 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. ...
1
vote
3answers
2k 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.
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
3answers
275 views

2 - 2ghz quad core processors or 2 - 3.0ghz dual core processors

I'm trying to decide which spare server I should use to build a backup file/print server. These are both Dell PE2950 machines that haven't been used in about a year or so. One has 2 2.0 ghz quad ...
1
vote
1answer
169 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 ...
1
vote
1answer
214 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 ...
1
vote
2answers
1k views

How to make the most of JBOSS in multicore environments

I'm deploying jboss in a multicore system, where I'll have from 12 to 20 cores, and when I run the jboss server, I only see 1 process running, and I feel like it won't use more than one core... Is ...
1
vote
2answers
401 views

Two Xeon Processors with Different Clock Speeds on the Same Motherboard: Possible?

If I have a 2.0gHz Woodcrest 5130 Xeon and a 1.6gHz Woodcrest 5110 Xeon, can I put them both on the same motherboard? The machine in question is a PowerEdge 2950.
1
vote
2answers
602 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 ...
1
vote
1answer
161 views

Should a core be “reserved” for the OS in a multi-core (SMP) Linux system?

If I plan to run eight applications on an eight core machine and expect all applications to utilise 100% cpu, will the OS "get enough time" for its own tasks or should I instead run seven applications ...
1
vote
1answer
94 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 ...