topic Re: Process suspended: RWAST in Operating System - OpenVMS

Process suspended: RWAST

Mike Stoddart — Fri, 08 Sep 2006 09:38:50 GMT

We have a situation where a process' AST count is edging towards zero and its DIO count is zero.

PROCESS:

- AST = 201, DIO = 5
- AST = 200, DIO = 4
- AST = 199, DIO = 3
- AST = 198, DIO = 2
- AST = 197, DIO = 1
- AST = 197, DIO = 0 *** Process suspended: RWAST

Presumably this means the ASTs are still active, yet we continue to queue new ones. Is there any means of determining more information on the active ASTs, such as the procedure's address the AST will invoke?

Thanks

Re: Process suspended: RWAST

Ian Miller. — Fri, 08 Sep 2006 10:18:51 GMT

From your descriptiption it appears the process is waiting in RWAST because it has run out of direct I/O quota and is awaiting for the active direct I/O's to complete.

You can look at the active I/O for the process in SDA
by starting with
$ ANAL/SYS
SDA> SHOW PROC/CHAN
and seeing which devices are active.

Re: Process suspended: RWAST

Andy Bustamante — Fri, 08 Sep 2006 10:53:52 GMT

What version of OpenVMS are you running?

There was an issue in 7.2-1 that sounds similiar to this behavior. In my case the problem behavior showed up on one system after the day's peak. The release notes for the ECO hit my e-mail described the problem while I was still gathering information.

Andy

Re: Process suspended: RWAST

Mike Stoddart — Fri, 08 Sep 2006 10:59:08 GMT

We're using 7.3-1. Is there a link for this problem? I'm not yet convinced that it's NOT a problem in our code. :)

Re: Process suspended: RWAST

Mike Stoddart — Fri, 08 Sep 2006 12:04:18 GMT

Looks like it is a problem in our software. Assume the obvious first - if the number of available ASTs is reducing, then not all of the ones you queue are firing! ;)