Re: kswapd taking 100% cpu with no swap on system

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]



> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx 
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Ali Ahsan
> Sent: Monday, May 09, 2011 1:52 PM
> To: centos@xxxxxxxxxx
> Subject: Re:  kswapd taking 100% cpu with no swap on system
> 
> On 05/09/2011 10:46 PM, Brunner, Brian T. wrote:
> >
> > 50GB in 0.12 ms is 500TB in 1.2 second.
> > SATA III buses at 6GB/sec need a "parallelness" of (nearly) 
> > 100 channels to soak up that data.
> > How many drives must be written-to in parallel to sustain that write
> > rate is ... Beyond my math skills.
> 
> Its only about Cassandra, not about my system :). SO whats your 
> suggestion about SATA driver ?

My suggestion:
That (first) you check your facts.  
What substantiates a claim of a 50GB/.12ms write-rate?  What
environment?
The claim is (AIUI) utterly misleading.  That (IMHO) gross
over-statement of Cassandra's write capacity makes any study of your
current system a pursuit after feral aquatic fowl.

I believe you were after an explanation as to why your kswapd was
running 100%? Lets stick to that and not drag in Cassandra vs MySQL.


Insert spiffy .sig here:
Life is complex: it has both real and imaginary parts.

//me
 
*******************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom
they are addressed. If you have received this email in error please
notify the system manager. This footnote also confirms that this
email message has been swept for the presence of computer viruses.
www.Hubbell.com - Hubbell Incorporated**

_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos


[Index of Archives]     [CentOS]     [CentOS Announce]     [CentOS Development]     [CentOS ARM Devel]     [CentOS Docs]     [CentOS Virtualization]     [Carrier Grade Linux]     [Linux Media]     [Asterisk]     [DCCP]     [Netdev]     [Xorg]     [Linux USB]
  Powered by Linux