Hi All
I am using the following Linux version for my application:
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[root at localhost ~]# uname -a
Linux localhost.localdom 2.6.18-164.el5 #1 SMP Thu Sep 3 03:28:30 EDT
2009 x86_64 x86_64 x86_64 GNU/Linux
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[root at localhost ~]# cat /etc/*release
CentOS release 5.4 (Final)
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When my application is running on the server i can see only one core
being used heavily while the other cores are not being used much. My
application has a major workload is collecting data from the eth0
interface and then doing a lot of processing with the data in the
database. So i can say that the Disk I/O and Network I/O are the major
contributors towards the workload.
from the /proc/interrupts file i can see the following:
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[root at localhost ~]# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 16084980 0 0 0 IO-APIC-edge timer
1: 141 0 0 0 IO-APIC-edge i8042
6: 5 0 0 0 IO-APIC-edge floppy
7: 0 0 0 0 IO-APIC-edge parport0
8: 0 0 0 0 IO-APIC-edge rtc
9: 0 0 0 0 IO-APIC-level acpi
12: 251 0 0 0 IO-APIC-edge i8042
51: 2410224 0 0 0 IO-APIC-level ioc0
59: 11358257 0 0 0 IO-APIC-level eth0
NMI: 0 0 0 0
LOC: 16086147 16090336 16090320 16089691
ERR: 0
MIS: 0
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From the above output i can see that all the interrupts are hitting the
cpu0 and thats why it is used more than any other core in the system.
Can someone please help me in distributing the interrupts across all the
cores so that all are used which will eventually result in a better
performance of my system.
Appreciate your response in this regard.
Thanks
Jatin
On 7/28/2014 11:16 PM, Jatin Davey wrote:> When my application is running on the server i can see only one core > being used heavily while the other cores are not being used much. My > application has a major workload is collecting data from the eth0 > interface and then doing a lot of processing with the data in the > database. So i can say that the Disk I/O and Network I/O are the major > contributors towards the workload.to use multiple cores, you need multiple processes or threads in your application. question: is this processing happening as fast as the network and disk can supply data? an app processing data from a single network connection and using a single database connection is not going to achieve much concurrency. btw, centos 5.4 is /way/ old, you're missing 5 years of security and bug fixes. 5.10 was released last october. a simple `yum update` will bring all repository packages up to the current fix level. -- john r pierce 37N 122W somewhere on the middle of the left coast
W dniu 2014-07-29 08:16, Jatin Davey pisze:> Hi All > > I am using the following Linux version for my application: > > **************************************** > [root at localhost ~]# uname -a > Linux localhost.localdom 2.6.18-164.el5 #1 SMP Thu Sep 3 03:28:30 EDT > 2009 x86_64 x86_64 x86_64 GNU/Linux > **************************************** > > **************************************** > [root at localhost ~]# cat /etc/*release > CentOS release 5.4 (Final) > **************************************** > > When my application is running on the server i can see only one core > being used heavily while the other cores are not being used much. My > application has a major workload is collecting data from the eth0 > interface and then doing a lot of processing with the data in the > database. So i can say that the Disk I/O and Network I/O are the major > contributors towards the workload. > > from the /proc/interrupts file i can see the following: > > **************************************************** > [root at localhost ~]# cat /proc/interrupts > CPU0 CPU1 CPU2 CPU3 > 0: 16084980 0 0 0 IO-APIC-edge timer > 1: 141 0 0 0 IO-APIC-edge i8042 > 6: 5 0 0 0 IO-APIC-edge floppy > 7: 0 0 0 0 IO-APIC-edge parport0 > 8: 0 0 0 0 IO-APIC-edge rtc > 9: 0 0 0 0 IO-APIC-level acpi > 12: 251 0 0 0 IO-APIC-edge i8042 > 51: 2410224 0 0 0 IO-APIC-level ioc0 > 59: 11358257 0 0 0 IO-APIC-level eth0 > NMI: 0 0 0 0 > LOC: 16086147 16090336 16090320 16089691 > ERR: 0 > MIS: 0 > **************************************************** > > From the above output i can see that all the interrupts are hitting the > cpu0 and thats why it is used more than any other core in the system. > > Can someone please help me in distributing the interrupts across all the > cores so that all are used which will eventually result in a better > performance of my system. > > Appreciate your response in this regard.Hi. Just use service irq balance: irqbalance from base repo of centos 5 IP> Thanks > Jatin > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >