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April 28, 2005
Fedora Core 3 and Java Web Start
The main point is that although Java 1.5 works very well on Fedora Core 3, the Java Web Start doesn't work at all.
I found this issue known and documented as bugs 6195591 and 6188963.
I found the solution from the diary of rmathew. Basically, the bug is fixed in the JDK 5.0 Update 3.
I've upgraded my java installation and everything looks good again.
Posted by Devlin at 10:56 PM | Comments (0)
April 27, 2005
Network Performance Variability between VMs
Nathan has done several network benchmarks with Windows 2003 Servers. Instead of looking at the average, I wanted to see if the performance between each virtual machine was consistent, or if some were being starved.
I've taken the data from Nathan's spreadsheet. It's divided into tests based on how many virtual machines were included. I wanted to see how similar the performance was for each virtual machine, or more correctly, how spread out the values were from each other. Standard Deviation to my aid. The graph below is of network operations per second.
Kind of interesting. The lower the standard deviation, the more similar performance between VMs. Between 13 and 17 VMs the data suggests that all the VMs got about the same performance. With less virtual machines, like the data from 3 to 9 Vms, show that performance differed substantially from one machine to another.
I will have to investigate further to put these "differences" into context, like, with a standard deviation of 0.6, how spread out or different are they really? How much can this affect performance over more time? Additional things to look at would be to try and determine if certain virtual machines consistently ran faster than others, or if they are perhaps distributed randomly.
Posted by Devlin at 05:22 PM | Comments (0)