Is it possible that this application that you are using is a single
threaded application? I run into this all the time, it can't take
advantage of the server you have it in and you'd be far better off
upping your RAM on the WTS server and turning it into a VDI host. None
of the apps listed are very good candidates for WTS and they all scream
for VDI. Doesn't Visual Studio alone want a GB of RAM?
The Sun Ray side isn't doing any of the heavy lifting so I'd seriously
doubt that's were the trouble lies. Nor does this sound like anything
with the network, but if you think you might be dropping packets check
out utcapture. There are a million guides out there for solaris perf
tuning (again, I doubt your problems are here). Start with prstat, and
go from there. Man netstat, iostat, sar, grab a Solaris version of Top
even.
Seth Galitzer wrote:
I've got 24 Sunray 2FS DTUs hanging off a single SRSS server (whitebox,
2x Xeon 2.6GHz CPU, 6GB RAM, Solaris 10). By default, they connect to a
Windows Terminal Server (SunFire X4600, 4x Opteron 8218 2.6GHz CPU, 16GB
RAM, Windows Server 2003) via srwc. The DTUs are on a completely
separate subnet from the rest of my network. The SRSS host has a single
interface that is on this subnet that is used for all DTU communication.
The SRSS host also has a direct cable link (crossover cable) to the WTS
host. Both the SRSS host interfaces and the WTS interface are all 1Gbps.
This setup is used in a classroom lab setting. During class, there can
be anywhere from 10-20 students using the lab at the same time. We are
a computer science program, so students use development platform
applications, such as Eclipse, Visual Studio, and Rational System
Architect (formerly Rational Rose), among others. In my second year of
running this system, we seem to be having significant performance
problems with a large number of users trying to load applications
simultaneously. eg, if a class comes in and they all login and try to
load eclipse, the system will grind to a halt and become completely
unresponsive until the app is loaded for everybody. This can take up to
30 min before the DTUs are usable.
I've been monitoring resource usage on the WTS host using Sysinternals
Process Explorer
(http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx). As far
as I can tell when the system gets bogged down like this, I am not
seeing any CPU. memory, or I/O wait causing the latency. The CPU
utilization jumps around between 20-60%, and I only see usage spikes on
2 of the 8 CPU cores. RAM utilization stays absolutely stable, right
around 4GB of my 16 available. File I/O is barely noticeable.
So the next thing I'd like to look at is the resource consumption of the
SRSS host. Can anybody point me at some good tools for this? I'd also
like to monitor the network usage and see if there's a bottleneck there.
Again, if there are any tools for this, or specific SRSS-related tools,
please let me know.
If anybody has any good load-balancing tips for my situation, I'd love
to hear them. I'm running SRSS 4.1 and srwc 2.1, I have not yet updated
to the latest release. I love my SunRays, but if this continues to be a
problem, I'll have to scrap them and go back to maintaining 24 PCs
again. I want to avoid this at all cost.
Thanks.
Seth
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