Hello. It was unclear to me where to send this because the latest version
of c3 isn't on the c3 web site, but rather, we found it over in the oscar
project. I included the C3 contacts and the oscar-devel list in this
email.
c3-5.0.1-1.src.rpm from oscar's page has a problem when there is a lot of
output. Basically, a write pipe blocks because the process that does to
the reading is in waitpid and not actively reading from the pipe.
This creates a deadlock.
In this patch, I moved the waitpid stuff after the pipe reads in the
area that caused the problem. I've attached a patch.
To duplicate the problem, run the script chunk below with a command similar
to the following (same problem with more than one node; just kept it to
one node for simplicity).
cexec -p rack_1:15-15 /tmp/runme 2500
The script:
#! /bin/bash
cnt=1
while [ $cnt -le $1 ]; do
echo "output line $cnt"
#echo $cnt
let cnt++
done
--
Erik Jacobson - Linux System Software - SGI - Eagan, Minnesota
diff -Narup c3-5.0.1.sgi-ORIG/src/cexec c3-5.0.1.sgi/src/cexec
--- c3-5.0.1.sgi-ORIG/src/cexec 2010-05-10 13:27:54.678174733 -0500
+++ c3-5.0.1.sgi/src/cexec 2010-05-12 15:10:59.988627176 -0500
@@ -488,10 +488,6 @@ try:
if( code != 0 ): returncode = code
os._exit(returncode)
pid_list_outer.append( pid )
- for pid in pid_list_outer: # wait for all processes spawned to finish
- pid, code = os.waitpid(pid,0)
- code = code>>8
- if( code != 0 ): returncode = code
if not dryrun:
output = ""
@@ -515,9 +511,13 @@ try:
continue
except IndexError:
print "No computer returned any output."
-
-
-
+
+ for pid in pid_list_outer: # wait for all processes spawned to finish
+ pid, code = os.waitpid(pid,0)
+ code = code>>8
+ if( code != 0 ): returncode = code
+
+
except KeyboardInterrupt:
print "Keyboard interrupt\n"
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