Archive for January, 2007
VMware Memory Usage
Thursday, January 25th, 2007Recently this question came accost my desk: VMware MUI (Management User Interface) tells me that a systems memory usage is less then what is allocated. How can this be when in the host OS it is using all the ram?
VMware has a few tricks up its sleave and I want to touch on two of them at the moment.
Memory trimming
VMware checks which part of the guest OS virtual memory is not used and allocates it back to the host OS. This permits to have more concurrent virtual machines running but everytime the guest OS asks back for its memory it suffers a performance degradation.
So, if you have enough free RAM for all planned concurrent VMs, be sure to disable memory trimming for guest OSes.
Page sharing
VMware uses a page sharing technique to allow guest memory pages with identical contents to be stored as a single copy-on-write page. Page sharing decreases host memory usage, but consumes system resources, potentially including I/O bandwidth.
You may want to avoid this overhead for guests for which host memory is plentiful and I/O latency is important.
All sites keep evolving
Monday, January 8th, 2007This web site has evolved a lot over the years, the last change was when I install WordPress and made my little place on the internet a blog. Now the next big thing!
I have decided it was time for this site to have its own domain name. My home page has moved and can now be found at http://www.chasingnuts.com please update any bookmarks you may have.
The name has to do with a recent nick name I acquired. Someone started calling me a squirrel. Then this person was asked what I did they would respond with a comment about me chasing or hunting down some nuts. It is true; I am pretty high energy and a busy body. Also, I do love hunting down answers to questions among other things.
In the future I plan to start posting more frequently about the nuts I find around the internet so if you have a preference let me know, macadamia or peanuts.
