Re: [SLE] empty the swap partition? slow internet
From: John Sowden (jsowden_at_americansentry.net)
To: email@example.com Date: Sun, 24 Apr 2005 15:56:08 -0700
On Sunday 24 April 2005 15:31, Randall R Schulz wrote:
> Carlos, John,
> On Sunday 24 April 2005 05:36, Carlos E. R. wrote:
> > The Saturday 2005-04-23 at 20:35 -0700, John Sowden wrote:
> > > I am running a 48MB 133Mhz machine with Suse 8.0
> > > It has worked fine on the net until today. The spped slowed down
> > > often to less than 100 bytes per second, and the hard drive
> > > thrashed for hours.
> > >
> > > Questions:
> > > Should the swap partition be empty upon cold boot? If so what is
> > > the command to test it to see how full it is, and to empty it, and
> > > in which boot file should it go?
> > There is no such thing, and no need either. Your problem must be
> > something else.
> > > It took me 8 hours to look at about 30 web pages of a ecommerce
> > > site. I never was able to make my purchases. Sometimes, it would
> > > take 15 minutes to bring a page up. more ram is an easy answer,
> > > but this is an old machine, and 48MB is overkill for other work.
> > > what has changed?
> > My guess is that those pages are using java, and java needs a lot of
> > memory. As you don't have it, it swaps a lot. I had the same problem
> > three years back, and had to upgrade the computer, no other way:
> > memory for old computers is prohibitive.
> As a blanket statement, "Java [software] needs a lot of memory" is not
> particularly accurate.
> As a Java programmer who has worked on some programs that _do_ use a lot
> of memory (by their nature, whether implemented in Java or something
> conventionally thought of as more parsimonious), I've noticed that when
> the program's demand for memory approaches the limit imposed by the
> Java Virtual Machine at the time it was launched, performance degrades
> very badly. This happens because the JVM must perform more and more
> garbage collection. This will not lead to swapping unless the Java heap
> limit is set large enough to cause the OS in which it's running to
> page. The default JVM heap limit won't do that on any system that's not
> already on the brink of thrashing.
> However, I now look back and see that John says "48 MB is overkill."
> From that perspective, Carlos is right. You'll have trouble running
> non-trivial Java code with so little RAM. In fact, I don't see how
> you're running a GUI environment of any sort in so little RAM.
> Generally speaking, the solution to such a problem with Java software is
> to increase the JVM maximum heap size by specifying the -Xmx<size>
> option, but I don't know how to do that for applets running within a
> John, which browser and which JVM release are you using?
> > Carlos Robinson
> Randall Schulz
First, thanks for all the feedback.
I am running the Konq that came with Suse 8.0.
I do not know which JVM I am running, but I did not install it,
so I assume it is the one that came with Suse 8.0.
If you tell me how, I will check that (and learn how at the same time!)
re: 48MB is overkill _for other work_, I was referring to MS-DOS 7.0 that I
use on the other computers in our office, and this one (boots DOS/Linux), as
well as my 128MB 1.3GHz Suse 8.2 machine (also boots DOS/Linux). I run our
mission critical and business stuff on DOS, although I am in the process of
re-writing all spreadsheets to open office.
re: this thrashing issue, it seems to happen after I have been on the net for
several hours, not when the machine is first turne on. Also I went back to
the electronics supplier site (mpjs.com) after shutting off the machine. It
degraded after about 15 minutes.
--- John Sowden American Sentry Systems. Inc. 1221 Andersen Drive San Rafael, CA 94901 U.L. Listed Central Station Alarm Service Serving the San Francisco Bay Area Since 1967 firstname.lastname@example.org http://www.americansentry.net -- Check the headers for your unsubscription address For additional commands send e-mail to email@example.com Also check the archives at http://lists.suse.com Please read the FAQs: firstname.lastname@example.org