Note a race condition in MPI_Init has been fixed yesterday in
the master.
can you please update your OpenMPI and try again ?
hopefully the hang will disappear.
Can you reproduce the crash with a simpler (and ideally
deterministic) version of your program.
the crash occurs in hashcode, and this makes little sense to me.
can you also update your jdk ?
Cheers,
Gilles
On Wednesday, July 6, 2016, Gundram Leifert
<gundram.leif...@uni-rostock.de> wrote:
Hello Jason,
thanks for your response! I thing it is another problem. I
try to send 100MB bytes. So there are not many tries
(between 10 and 30). I realized that the execution of this
code can result 3 different errors:
1. most often the posted error message occures.
2. in <10% the cases i have a live lock. I can see 3
java-processes, one with 200% and two with 100% processor
utilization. After ~15 minutes without new system outputs
this error occurs.
[thread 47499823949568 also had an error]
# A fatal error has been detected by the Java Runtime
Environment:
#
# Internal Error (safepoint.cpp:317), pid=24256,
tid=47500347131648
# guarantee(PageArmed == 0) failed: invariant
#
# JRE version: 7.0_25-b15
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.25-b01
mixed mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled.
To enable core dumping, try "ulimit -c unlimited" before
starting Java again
#
# An error report file with more information is saved as:
# /home/gl069/ompi/bin/executor/hs_err_pid24256.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#
[titan01:24256] *** Process received signal ***
[titan01:24256] Signal: Aborted (6)
[titan01:24256] Signal code: (-6)
[titan01:24256] [ 0]
/usr/lib64/libpthread.so.0(+0xf100)[0x2b336a324100]
[titan01:24256] [ 1]
/usr/lib64/libc.so.6(gsignal+0x37)[0x2b336a9815f7]
[titan01:24256] [ 2]
/usr/lib64/libc.so.6(abort+0x148)[0x2b336a982ce8]
[titan01:24256] [ 3]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x742ac5)[0x2b336b44fac5]
[titan01:24256] [ 4]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x8a2137)[0x2b336b5af137]
[titan01:24256] [ 5]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x407262)[0x2b336b114262]
[titan01:24256] [ 6]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x7c6c34)[0x2b336b4d3c34]
[titan01:24256] [ 7]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x8a9c17)[0x2b336b5b6c17]
[titan01:24256] [ 8]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x8aa2c0)[0x2b336b5b72c0]
[titan01:24256] [ 9]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x744270)[0x2b336b451270]
[titan01:24256] [10]
/usr/lib64/libpthread.so.0(+0x7dc5)[0x2b336a31cdc5]
[titan01:24256] [11]
/usr/lib64/libc.so.6(clone+0x6d)[0x2b336aa4228d]
[titan01:24256] *** End of error message ***
-------------------------------------------------------
Primary job terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been
aborted.
-------------------------------------------------------
--------------------------------------------------------------------------
mpirun noticed that process rank 0 with PID 0 on node
titan01 exited on signal 6 (Aborted).
--------------------------------------------------------------------------
3. in <10% the cases i have a dead lock while MPI.init. This
stays for more than 15 minutes without returning with an
error message...
Can I enable some debug-flags to see what happens on C /
OpenMPI side?
Thanks in advance for your help!
Gundram Leifert
On 07/05/2016 06:05 PM, Jason Maldonis wrote:
After reading your thread looks like it may be related to
an issue I had a few weeks ago (I'm a novice though). Maybe
my thread will be of help:
https://www.open-mpi.org/community/lists/users/2016/06/29425.php
When you say "After a specific number of repetitions the
process either hangs up or returns with a SIGSEGV." does
you mean that a single call hangs, or that at some point
during the for loop a call hangs? If you mean the latter,
then it might relate to my issue. Otherwise my thread
probably won't be helpful.
Jason Maldonis
Research Assistant of Professor Paul Voyles
Materials Science Grad Student
University of Wisconsin, Madison
1509 University Ave, Rm M142
Madison, WI 53706
maldo...@wisc.edu
608-295-5532
On Tue, Jul 5, 2016 at 9:58 AM, Gundram Leifert
<gundram.leif...@uni-rostock.de> wrote:
Hello,
I try to send many byte-arrays via broadcast. After a
specific number of repetitions the process either hangs
up or returns with a SIGSEGV. Does any one can help me
solving the problem:
########## The code:
import java.util.Random;
import mpi.*;
public class TestSendBigFiles {
public static void log(String msg) {
try {
System.err.println(String.format("%2d/%2d:%s",
MPI.COMM_WORLD.getRank(), MPI.COMM_WORLD.getSize(), msg));
} catch (MPIException ex) {
System.err.println(String.format("%2s/%2s:%s", "?",
"?", msg));
}
}
private static int hashcode(byte[] bytearray) {
if (bytearray == null) {
return 0;
}
int hash = 39;
for (int i = 0; i < bytearray.length; i++) {
byte b = bytearray[i];
hash = hash * 7 + (int) b;
}
return hash;
}
public static void main(String args[]) throws
MPIException {
log("start main");
MPI.Init(args);
try {
log("initialized done");
byte[] saveMem = new byte[100000000];
MPI.COMM_WORLD.barrier();
Random r = new Random();
r.nextBytes(saveMem);
if (MPI.COMM_WORLD.getRank() == 0) {
for (int i = 0; i < 1000; i++) {
saveMem[r.nextInt(saveMem.length)]++;
log("i = " + i);
int[] lengthData = new
int[]{saveMem.length};
log("object hash = " +
hashcode(saveMem));
log("length = " + lengthData[0]);
MPI.COMM_WORLD.bcast(lengthData, 1, MPI.INT
<http://MPI.INT>, 0);
log("bcast length done (length = "
+ lengthData[0] + ")");
MPI.COMM_WORLD.barrier();
MPI.COMM_WORLD.bcast(saveMem, lengthData[0], MPI.BYTE, 0);
log("bcast data done");
MPI.COMM_WORLD.barrier();
}
MPI.COMM_WORLD.bcast(new int[]{0}, 1,
MPI.INT <http://MPI.INT>, 0);
} else {
while (true) {
int[] lengthData = new int[1];
MPI.COMM_WORLD.bcast(lengthData, 1, MPI.INT
<http://MPI.INT>, 0);
log("bcast length done (length = "
+ lengthData[0] + ")");
if (lengthData[0] == 0) {
break;
}
MPI.COMM_WORLD.barrier();
saveMem = new byte[lengthData[0]];
MPI.COMM_WORLD.bcast(saveMem, saveMem.length, MPI.BYTE, 0);
log("bcast data done");
MPI.COMM_WORLD.barrier();
log("object hash = " +
hashcode(saveMem));
}
}
MPI.COMM_WORLD.barrier();
} catch (MPIException ex) {
System.out.println("caugth error." + ex);
log(ex.getMessage());
} catch (RuntimeException ex) {
System.out.println("caugth error." + ex);
log(ex.getMessage());
} finally {
MPI.Finalize();
}
}
}
############ The Error (if it does not just hang up):
#
# A fatal error has been detected by the Java Runtime
Environment:
#
# SIGSEGV (0xb) at pc=0x00002b7e9c86e3a1, pid=1172,
tid=47822674495232
#
#
# A fatal error has been detected by the Java Runtime
Environment:
# JRE version: 7.0_25-b15
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.25-b01
mixed mode linux-amd64 compressed oops)
# Problematic frame:
# #
# SIGSEGV (0xb) at pc=0x00002af69c0693a1, pid=1173,
tid=47238546896640
#
# JRE version: 7.0_25-b15
J
de.uros.citlab.executor.test.TestSendBigFiles.hashcode([B)I
#
# Failed to write core dump. Core dumps have been
disabled. To enable core dumping, try "ulimit -c
unlimited" before starting Java again
#
# Java VM: Java HotSpot(TM) 64-Bit Server VM (23.25-b01
mixed mode linux-amd64 compressed oops)
# Problematic frame:
# J
de.uros.citlab.executor.test.TestSendBigFiles.hashcode([B)I
#
# Failed to write core dump. Core dumps have been
disabled. To enable core dumping, try "ulimit -c
unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/gl069/ompi/bin/executor/hs_err_pid1172.log
# An error report file with more information is saved as:
# /home/gl069/ompi/bin/executor/hs_err_pid1173.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#
[titan01:01172] *** Process received signal ***
[titan01:01172] Signal: Aborted (6)
[titan01:01172] Signal code: (-6)
[titan01:01173] *** Process received signal ***
[titan01:01173] Signal: Aborted (6)
[titan01:01173] Signal code: (-6)
[titan01:01172] [ 0]
/usr/lib64/libpthread.so.0(+0xf100)[0x2b7e9596a100]
[titan01:01172] [ 1]
/usr/lib64/libc.so.6(gsignal+0x37)[0x2b7e95fc75f7]
[titan01:01172] [ 2]
/usr/lib64/libc.so.6(abort+0x148)[0x2b7e95fc8ce8]
[titan01:01172] [ 3]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x742ac5)[0x2b7e96a95ac5]
[titan01:01172] [ 4]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x8a2137)[0x2b7e96bf5137]
[titan01:01172] [ 5]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(JVM_handle_linux_signal+0x140)[0x2b7e96a995e0]
[titan01:01172] [ 6] [titan01:01173] [ 0]
/usr/lib64/libpthread.so.0(+0xf100)[0x2af694ded100]
[titan01:01173] [ 1]
/usr/lib64/libc.so.6(+0x35670)[0x2b7e95fc7670]
[titan01:01172] [ 7] [0x2b7e9c86e3a1]
[titan01:01172] *** End of error message ***
/usr/lib64/libc.so.6(gsignal+0x37)[0x2af69544a5f7]
[titan01:01173] [ 2]
/usr/lib64/libc.so.6(abort+0x148)[0x2af69544bce8]
[titan01:01173] [ 3]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x742ac5)[0x2af695f18ac5]
[titan01:01173] [ 4]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(+0x8a2137)[0x2af696078137]
[titan01:01173] [ 5]
/home/gl069/bin/jdk1.7.0_25/jre/lib/amd64/server/libjvm.so(JVM_handle_linux_signal+0x140)[0x2af695f1c5e0]
[titan01:01173] [ 6]
/usr/lib64/libc.so.6(+0x35670)[0x2af69544a670]
[titan01:01173] [ 7] [0x2af69c0693a1]
[titan01:01173] *** End of error message ***
-------------------------------------------------------
Primary job terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has
been aborted.
-------------------------------------------------------
--------------------------------------------------------------------------
mpirun noticed that process rank 1 with PID 0 on node
titan01 exited on signal 6 (Aborted).
########CONFIGURATION:
I used the ompi master sources from github:
commit 267821f0dd405b5f4370017a287d9a49f92e734a
Author: Gilles Gouaillardet <gil...@rist.or.jp>
Date: Tue Jul 5 13:47:50 2016 +0900
./configure --enable-mpi-java
--with-jdk-dir=/home/gl069/bin/jdk1.7.0_25
--disable-dlopen --disable-mca-dso
Thanks a lot for your help!
Gundram
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