4
votes
6answers
355 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
1answer
65 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
0answers
110 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 ...
-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
3answers
256 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
168 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 ...
0
votes
1answer
200 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 ...
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
4answers
568 views

Free alternative to NI Real-Time Hypervisor?

Is there an free alternative to National Instruments' NI Real-Time Hypervisor? National Instruments provides both a Windows and Linux versions.
0
votes
2answers
606 views

How many cores are available in this case?

We're managing 2 production server. One is RHEL4 and other one is CentOS5. In order to find the load average, I need to determine how many cores the server has got. I used the command $ grep cores ...
2
votes
1answer
221 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 ...
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 ...
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 ...
1
vote
1answer
159 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 ...
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 ...
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 ...