Michal Hlavinka wrote:
> one our user has found ksh scripts are failing when system is under heavy
> load.
This sounds like an issue I had in the past. Under heavy disk usage
(nightly backups, kernel compile, or "find / -user 1234 ..."), ksh93
sessions would *sometimes*, not always, die with an "Alarm Clock"
message:
.............cut here.........
ksh93$ ## ksh93 prompt
Alarm Clock ## ksh93 times out and logs me out?
$ ## /usr/bin/sh prompt (Heirloom-sh)
.............cut here.........
At first I thought it was related to the ksh TMOUT variable. I tried
"TMOUT=0; export TMOUT" and then "unset TMOUT" in my $HOME/.kshrc but
the problem persisted. I also tried using ksh93 as my login shell
instead of heirloom-sh (Bourne port from OpenSolaris) then running
ksh93 after login. Problem persisted.
I was trying to gather more information before reporting the issue.
Although it happened frequently it did not happen consistently.
I upgraded to Version JM 93t+ 2009-05-01 when it was available and
the problem went away.
Issues occurred on Debian 4.0/x86 system with all the latest updates.
Affected versions:
------------------
ksh93t 2008-11-04
linux binary from AST and built from source on the Debian 4.0 system
ksh93$ echo ${.sh.version}
Version M 93t 2008-11-04
Debian 4.0 Intel x86 stock ksh93:
debian$ echo ${.sh.version}
Version M 1993-12-28 r
Slackware 12.2 Intel x86 stock ksh93:
slackware$ echo ${.sh.version}
Version M 1993-12-28 s+
I copied the Slackware binary to the Debian system. I know this
isn't the best thing to do but at the time I was just trying to get
a stable ksh93 and the library dependencies were the same.
Unaffected:
-----------
ksh.2009-05-05.linux.i386 binary from AST web site
ksh93$ echo ${.sh.version}
Version JM 93t+ 2009-05-01
Since the binary ksh93t is working, I haven't bothered to build
from source again. Some day I will.
Probably an unrelated issue: I also experienced a hang in ksh93
(affected versions listed above) when running some pipelines, eg.:
"env | sort" or "env | grep TMOUT". While this was a consistent
problem, I seem to remember seeing something in the change log about
this being fixed. For the record, the problem does not exist in
Version JM 93t+ 2009-05-01.
I want to say thanks to all the AST folks. ksh93 is great and
I've moved to it as my default shell instead of bash.
Keep up the good work!
--
scot
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