Performance

[Ugo Bellavance]

Ender SEVINC wrote:
> Hi,
> we have such a problem with our server performance.
> Let me first introduce our server;we have a HP
> Proliant ML370 host machine with double CPU, each of
> which is Xeon 3.0 GHz. with 1 MB. L3 cache.
> But unfortunately, we cannot get the performance of
> parallel processing to the degree we want. Each Xeon
> CPU is seen as 2 CPUs, because of being Xeon and HT
> technology, and totally 4 CPUs are seen while the
> server is running by the OS. 
> But the point is that those 4 CPUs are running
> sequentially, not parallely. As a result, while
> running an application esp. needing CPU,  on the
> server, we cannot use the total CPU power upto 100% or
> close. In other words, there is little or zero
> performance gradation while running the application on
> our server when compared to a normal PC. We use RHL
> 9.0 and the kernel is 2.4.20-20.9. 
> I think that the kernel does not let to use system
> resources totally. Perhaps another RHL 9.0 kernel
> might not only let to use system resources fully but
> also runs our applicatiom without a problem. I
> remember that with RHL 7.3 version, there was not such
> a problem. All CPUs were working parallely with it,
> 7.3 and we get the full CPU power. But now our CPU
> utilization is about 25-30%. We have to use RHL 9.0
> from now on, and would be better to run the CPUs
> parallelly. 
> My question is that have you ever encountered such a
> problem, and do you have any idea to overcome such a
> situation?
> Do you have any supposal, if any, i like to hear.
> Sincerely.

Are your application using threads?  I thinkt this is necessary to
benefit from HT.

You're using a SMP kernel right?