Do you have dual CPU's or a single CPU on this machine? Your top output shows
I have a dual Xeon system that works great when hyperthreading is enabled (top
output shows 4 virtual CPUs) but when a new kernel loaded them without their
"sibling", meaning no hyperthreading (top output shows two CPUs), performance
was severely degraded. So I "downgraded" to an earlier kernel that would load
them as 4 virtual CPUs, and the machine runs fine.
Also, if this machine is a NFS server, try unmounting all the NFS clients and
see if there is still a problem.
Random freezes could also point to a bad or overheated CPU.
On Wed, 11 May 2005, Gabe Langbaue wrote:
>Okay, the whole story goes like this...we had an old sun system that ran
>these scripts. When I started taking care of it in September, it was
>obvious that this system was too old and decrepit to continue. Luckily, I
>was able to convince the powers that be that a new system was needed. The
>new system came in December, and we transfered all scripts and updated
>GEMPAK and LDM to the new versions. The system worked fine from about
>Christmas until maybe a month ago. Around this time I added a couple
>scripts (model differences). When the crashes started occuring, my
>immediate thought was an error with one of the new scripts. Therefore, I
>disabled all of them, to no avail. I then looked and found a java script
>that had stopped working and thought that was the problem. I disbaled it
>and found no change in performance.
>It appears to me that the crashes occur randomly. At different times of
>the day and after very different uptimes. Sometimes we're up for a week,
>sometimes (like yesterday) 3 crashes in a single day. Therefore, I
>conclude that if it is a single script, it's one that runs at least
>hourly. I've made a list of all of these scripts and am now disabling
>them one by one to see if I get any results.