On Sat, Oct 08, 2022 at 05:17:09PM +0200, Tobias Pape wrote:
> 
> > On 8. Oct 2022, at 16:37, David T. Lewis <lewis at mail.msen.com> wrote:
> > 
> > On Fri, Oct 07, 2022 at 06:00:21PM -0500, Chris Muller wrote:
> >> I'm 98% certain the issue is the new memory monitor running
> >> 
> >>   OSProcess outputOf: 'cat /proc/meminfo'
> >> 
> >> every 5 seconds.  It automatically disables on any Error.  Unfortunately,
> >> #outputOf: appears to have a slow resource leak that causes a slow grind to
> >> a halt -- never signaling any Errors, and never crashing.  My attempt to
> >> make the server more resilient has ironically resulted in it being more
> >> fragile.
> >> 
> >> So, I think I'm going to try going back to my old method which uses
> >> #command:
> >> 
> >>     OSProcess command: 'cat /proc/meminfo -> meminfo.out'
> >> 
> >> and then parsing meminfo.out.  I'm hopeful #command: will not have the same
> >> issue.
> >> 
> > 
> > Hi Chris,
> > 
> > That's a lot of OSProcess/CommandShell invocations, over 17 thousand
> > per day. Each one is setting up three pipe connections (six file
> > descriptors), and each requires the unix signal handler to clean up
> > the exited child and close open pipe handles. I would not be too
> > surprised if intermittent problems were to accumulate over time at
> > that rate (missed unix signals under heavy load? I don't know).
> > 
> > If the file descriptor leak is associated with OSProcess, you will see
> > pipe entries accumulating in /proc/<pid>/fd. If the leak is coming from
> > SqueakSource stuff, you will see socket handles. Let's keep an eye on
> > it and see which it is. I think your intuition is right but we may as
> > well confirm it.
> 
> Also why not simply reading the file? Like with filestream???
> 
> Best regards
> 	-Tobias
>

Good question. It does not seem to work as expected, apparently
because primitiveFileSize answers 0 for this kind of file.

But here is a workaround that seems to get the job done:

| fs |
[[fs := FileStream readOnlyFileNamed: '/proc/meminfo'.
fs next: 100000]
	on: Error do: ['']]
		ensure: [ fs ifNotNil: [fs close]].

Dave