Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [multi-core]

133 questions
6
votes
5 answers

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 database sessions Oracle is installed on Linux…
Alex
  • 61
  • 1
  • 2
6
votes
2 answers

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 count the number of HT cores for this as well? Or do…
anonymous-one
  • 958
  • 4
  • 26
  • 43
6
votes
4 answers

need high performance /bin/sort; any suggestions?

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, but I want something less IO intensive. I'm looking to sort…
Daniel
  • 175
  • 1
  • 6
5
votes
1 answer

AWS EC2 instance hyperthreading

I am currently doing some performance testing of web-apps that we have moved to AWS. One of the things we have noticed is that vCPU performance doesn't seem to be nearly as good as we'd expected. In fact, on a highly utilize single vCPU machine we…
zmcmahon
  • 211
  • 3
  • 7
5
votes
1 answer

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 Threads 8 and cat /proc/cpuinfo…
keeth
  • 53
  • 3
5
votes
3 answers

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 each core to use the multiple cores of my…
enedebe
  • 1,006
  • 3
  • 11
  • 17
4
votes
2 answers

Scan the full filesystem in parallel with clamscan

I run a clamav scan weekly on my servers. There is one server with a raid6 cluster of 30TB of disk space where the scan take more than 24h to run. So I wonder how can I run clamscan on the whole filesystem, taking advantage of the several cores the…
azmeuk
  • 165
  • 1
  • 14
4
votes
2 answers

NUMA CPU numbering in Linux

I have access to two NUMA servers. One of them is Dell R720 and has these CPUs: $ cat /proc/cpuinfo |grep Xeon|sort|uniq -c 24 model name : Intel(R) Xeon(R) CPU E5-2630L v2 @ 2.40GHz The other is a HPE DL360 Gen8 and has these CPUs: $ cat…
juhist
  • 272
  • 1
  • 3
  • 10
4
votes
6 answers

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

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 1.5, the second core usage is often 0%. They want…
usedTobeaMember
  • 616
  • 15
  • 25
4
votes
9 answers

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

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 running Fedora 9 x32. This machine has 4 Gig of RAM and…
Eddie
  • 11,332
  • 8
  • 36
  • 48
4
votes
2 answers

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-core CPUs I already know the licensing…
Massimo
  • 68,714
  • 56
  • 196
  • 319
4
votes
3 answers

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 possible does it have something to do with the…
Grimlockz
  • 315
  • 1
  • 2
  • 11
4
votes
1 answer

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 express are running, which processor does each…
user193655
  • 253
  • 1
  • 5
  • 17
4
votes
2 answers

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 will see 2 cores. How do I do this in xen? I…
Amandasaurus
  • 30,211
  • 62
  • 184
  • 246
3
votes
0 answers

How many celery and gunicorn workers on the same server?

I have one server that runs a Django application served by gunicorn and a Celery task queue. Gunicorn docs suggest (2 x $num_cores) + 1 as the default number of workers. Celery docs show that the number of Celery workers defaults to 1 x…
YPCrumble
  • 175
  • 6
1
2
3
…
8 9