[CentOS] kswapd taking 100% cpu with no swap on system

> 
> Actually i dont have any issue with read and write,If you 
> have experience with Cassandra NoSQL database,Its very read 
> and write intensive.It will approximately  doing 10 Million 
> concurrent   read and writes.AS per Cassandra documentation 
> "Cassandra can write 50GB of data in 0.12 milliseconds, more 
> than 2,500 times faster than MySQL." 

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.

Advertizing, or inadvertizing, has fudged a few numbers here.
*******************************************************************
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**