|
Diego,
What were you doing in QShell that didn't perform well when hostname
was a mess? I've seen this too, but it was under specific situations
where a program connected to the local system via Java classes.
You might think "it's the local system, why would networking even
apply" -- it applies because it's necessary to connect to network
servers to do things like call native programs, run SQL, etc. Java
(and probably other things as well) tries to determine the appropriate
IP address to connect to by asking what the local hostname is, then
doing an IP address lookup on that name. If that name isn't in the
hosts table, then it'll try a DNS server. If the DNS server is slow,
this can add a huge overhead. Likewise, if there are multiple DNS
servers and one is timing out, it can add a huge overhead. IBM has
run into this many times, so one of the first things they look for is
to make sure your local host name is in the hosts file so this doesn't
happen.
But, what Mark is doing doesn't use those network servers. He's
running native C code that directly runs on the local system.
On 6/20/2017 9:30 AM, Diego Kesselman wrote:
Skott,
I've experienced slow response in QSHELL when hostname is a mess.
Mark,
Do you have any DNS configuration ? (CFGTCP -> Option 12) If so, are
you using *LOCAL or *REMOTE ?
Do you have an entry on host tables for FQDN (hostname + domain name)
and hostname ?
Regards
Diego Kesselman
El 20/06/17 a las 09:15, Scott Klement escribió:
Mark,
I must admit, I don't see what Diego's suggestion has to do with
what you are doing... his suggestion is more related to Java
programs being able to detect and connect to the local system --
which is known to perform slowly if you don't have the local host
name in your hosts table. But, has nothing to do with your shell
script.
But, I'm really shocked at the result... 15 seconds to run
'hostname'?! Seriously? This is just a simple program that
retrieve's the system's hostname from memory and prints it.
Shouldn't even take 1 second on a slow system.
Something is very wrong.
-SK
On 6/19/2017 9:53 PM, mlazarus wrote:
Diego,
hostname took about 15 seconds. java -version took about 50
seconds.
-mark
As an Amazon Associate we earn from qualifying purchases.
This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].
Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.
midrange.com
