Simultaneous DLLHost splitting 50% cpu each ... ?

We have an IIS 5.0 / W2K application, and we'are suffering very low
performance ... we're not talking about hundreds of users connected, but one
single user could bring to it's knees the whole server ...

We're only suffering this application ... we didn't develop it, and the
providers seem to have no idea of what is going on here. We have very
limited knowledge of it's internals ... and the original developer seems to
have dissapeared !

This application is ASP using COM+ .dll's, and when is running, we can count
as much as 30 DLLHost process running at the same time. The machine has
plenty of RAM (2 Gb ... we don't see any shorttage here), and each DLLHost
consumes about 15 to 50 Mb of memory ... so fa so good ...

But some actions trigered by the user of the application make that -
generally - TWO of this DLLHost processes began to cope with ALL cpu
resources of the machine, splitting about 50% cpu each ... and this can last
for about one minute or so, during which time the machine performance is
very, very bad.

So, in my ignorance, it seems to me than in those cases, the problem is that
some function hosted in DLLHost-1 is making calls - thousands perhaps -, to
some other function hosted in DLLHost-2, and as the calls have to cross
process boundaries, then most of the time is wasted in the COM+ system
marshaling the data ... ¿ I'm saying some stupid thing ? I'm very lost with
this issue.

¿ Any one of you can bring me some light ?

Thanks

Probably a bad script in the pages.

Try running IISState against the DLLHost(s) when they are causing the
problem:

iisstate -p <pid of dllhost> <enter>

If you need help w/the log, post it to the group.


Pat

"Lluis O" <llob.correobasurano RemoveThis @menta.net> wrote in message
news:eiFx8$Z9DHA.1052@TK2MSFTNGP12.phx.gbl...
 > We have an IIS 5.0 / W2K application, and we'are suffering very low
 > performance ... we're not talking about hundreds of users connected, but
one
 > single user could bring to it's knees the whole server ...
 >
 > We're only suffering this application ... we didn't develop it, and the
 > providers seem to have no idea of what is going on here. We have very
 > limited knowledge of it's internals ... and the original developer seems
to
 > have dissapeared !
 >
 > This application is ASP using COM+ .dll's, and when is running, we can
count
 > as much as 30 DLLHost process running at the same time. The machine has
 > plenty of RAM (2 Gb ... we don't see any shorttage here), and each DLLHost
 > consumes about 15 to 50 Mb of memory ... so fa so good ...
 >
 > But some actions trigered by the user of the application make that -
 > generally - TWO of this DLLHost processes began to cope with ALL cpu
 > resources of the machine, splitting about 50% cpu each ... and this can
last
 > for about one minute or so, during which time the machine performance is
 > very, very bad.
 >
 > So, in my ignorance, it seems to me than in those cases, the problem is
that
 > some function hosted in DLLHost-1 is making calls - thousands perhaps -,
to
 > some other function hosted in DLLHost-2, and as the calls have to cross
 > process boundaries, then most of the time is wasted in the COM+ system
 > marshaling the data ... ¿ I'm saying some stupid thing ? I'm very lost
with
 > this issue.
 >
 > ¿ Any one of you can bring me some light ?
 >
 > Thanks
 >
 ><!-- ~MESSAGE_AFTER~ -->