Re: [mat-dev] java.io.FileNotFoundException: /mat-work/nikhil/MAT1.11/ma

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Re: [mat-dev] java.io.FileNotFoundException: /mat-work/nikhil/MAT1.11/mat/../../sacbay-m-big77GB.inbound.index3096.log (Too many open files)

From: Andrew Johnson <andrew_johnson@xxxxxxxxxx>
Date: Wed, 7 Jul 2021 12:39:17 +0100
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Memory Analyzer does create a lot of files at the re-indexing stage as it helps to build the inbound index. These are deleted once that stage is over, so you don't normally notice them.

You need to increase the limit on the number of open files for your process. Something like
ulimit -S -n 4096
would increase the soft limit for the process - if 4096 is too small for MAT with this dump you will still get the error. There is a hard limit of the number of open files:
ulimit -H -n
and an ordinary user can't increase the soft limit beyond the hard limit. If you need more then you need root access or a system administrator to increase the limits for your userid
The administrator might need to change something like the following.

/etc/security/limits.conf
* - nofile 16384

Once that is done you might need to log in again and run
ulimit -S -n 16384

Andrew Johnson

From: "Nikhil Dongre" <nikhil.vilas@xxxxxxxxx>
To: "Memory Analyzer Dev list" <mat-dev@xxxxxxxxxxx>
Date: 07/07/2021 06:51
Subject: Re: [mat-dev] java.io.FileNotFoundException: /mat-work/nikhil/MAT1.11/mat/../../sacbay-m-big77GB.inbound.index3096.log (Too many open files)
Sent by: "mat-dev" <mat-dev-bounces@xxxxxxxxxxx>

Here are some more details
Please find the command ulimit -a output below :

[opc@ci-iad-mat-lab-01 mat]$ ulimit -a

core file size (blocks, -c) 0

data seg size (kbytes, -d) unlimited

scheduling priority (-e) 0

file size (blocks, -f) unlimited

pending signals (-i) 239754

max locked memory (kbytes, -l) 64

max memory size (kbytes, -m) unlimited

open files (-n) 1024

pipe size (512 bytes, -p) 8

POSIX message queues (bytes, -q) 819200

real-time priority (-r) 0

stack size (kbytes, -s) 8192

cpu time (seconds, -t) unlimited

max user processes (-u) 4096

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

[opc@ci-iad-mat-lab-01 mat]$

Hprof file size is : 77GB

MAT version : 1.11

And its failing after this step "Re-indexing outbound index"

[Task: Parsing /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.hprof

[

Subtask: Scanning /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.hprof

[....................

[INFO] Wrote threads call stacks to /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.threads

[....................

[INFO] Heap /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.hprof contains 1,168,946,725 objects

[....................

Subtask: Extracting objects from /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.hprof

[................................................................................Task: Removing unreachable objects

[

Subtask: Searching for unreachable objects

[

Subtask: Marking reachable objects

Subtask: Re-indexing objects

[INFO] Removed 72,901,319 unreachable objects using 6,692,864,976 bytes

[..

Subtask: Re-indexing classes

[...

Subtask: Writing /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.idx.index

[....

Subtask: Writing /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.o2c.index

[.....

Subtask: Writing /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.a2s.index

[......

Subtask: Re-indexing outbound index

[......]

eclipse.buildId=unknown

java.version=1.8.0_292

java.vendor=Red Hat, Inc.

BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US

Framework arguments: -application org.eclipse.mat.api.parse -DhprofStrictnessWarning=true ../../sacbay-m-big77GB.hprof org.eclipse.mat.api:suspects org.eclipse.mat.api:top_components org.eclipse.mat.api:overview

Command-line arguments: -os linux -ws gtk -arch x86_64 -consolelog -application org.eclipse.mat.api.parse -DhprofStrictnessWarning=true ../../sacbay-m-big77GB.hprof org.eclipse.mat.api:suspects org.eclipse.mat.api:top_components org.eclipse.mat.api:overview

!ENTRY org.eclipse.osgi 4 0 2021-07-07 05:32:46.312

!MESSAGE Application error

!STACK 1

org.eclipse.mat.SnapshotException: Error opening heap dump 'sacbay-m-big77GB.hprof'. Check the error log for further details.

at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.parse(SnapshotFactoryImpl.java:331)

at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.openSnapshot(SnapshotFactoryImpl.java:167)

at org.eclipse.mat.snapshot.SnapshotFactory.openSnapshot(SnapshotFactory.java:147)

at org.eclipse.mat.internal.apps.ParseSnapshotApp.parse(ParseSnapshotApp.java:138)

at org.eclipse.mat.internal.apps.ParseSnapshotApp.start(ParseSnapshotApp.java:110)

at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)

at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)

at org.eclipse.equinox.launcher.Main.run(Main.java:1447)

at org.eclipse.equinox.launcher.Main.main(Main.java:1420)

Caused by: java.io.FileNotFoundException: /mat-work/nikhil/MAT1.11_Normal/mat/../../sacbay-m-big77GB.inbound.index3096.log (Too many open files)

at java.io.FileOutputStream.open0(Native Method)

at java.io.FileOutputStream.open(FileOutputStream.java:270)

at java.io.FileOutputStream.<init>(FileOutputStream.java:213)

at java.io.FileOutputStream.<init>(FileOutputStream.java:162)

at org.eclipse.mat.parser.index.IndexWriter$InboundWriter.log(IndexWriter.java:1237)

at org.eclipse.mat.parser.internal.GarbageCleaner.clean(GarbageCleaner.java:360)

at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.parse(SnapshotFactoryImpl.java:282)

... 17 more

On Wed, Jul 7, 2021 at 9:03 AM Nikhil Dongre <nikhil.vilas@xxxxxxxxx> wrote:
Hi Kevin,

Thanks for the quick response.

Please find the command output below :

[opc@ci-iad-mat-lab-01 mat]$ ulimit -a

core file size (blocks, -c) 0

data seg size (kbytes, -d) unlimited

scheduling priority (-e) 0

file size (blocks, -f) unlimited

pending signals (-i) 239754

max locked memory (kbytes, -l) 64

max memory size (kbytes, -m) unlimited

open files (-n) 1024

pipe size (512 bytes, -p) 8

POSIX message queues (bytes, -q) 819200

real-time priority (-r) 0

stack size (kbytes, -s) 8192

cpu time (seconds, -t) unlimited

max user processes (-u) 4096

virtual memory (kbytes, -v) unlimited

file locks (-x) unlimited

[opc@ci-iad-mat-lab-01 mat]$

Regards

Nikhil Dongre

On Wed, Jul 7, 2021 at 8:52 AM Kevin Grigorenko <kevin.grigorenko@xxxxxxxxxx> wrote:
The error "Too many open files" may occur because your file ulimit is too small, system-wide limits have been exceeded, or there is a bug in MAT creating too many file descriptors (in decreasing order of probability). Please start a terminal and send the output of the following command:

$ ulimit -a

--
Kevin Grigorenko
IBM App Platform SWAT

From: "Nikhil Dongre" <nikhil.vilas@xxxxxxxxx>
To: mat-dev@xxxxxxxxxxx
Date: 07/06/2021 06:01 PM
Subject: [EXTERNAL] [mat-dev] java.io.FileNotFoundException: /mat-work/nikhil/MAT1.11/mat/../../sacbay-m-big77GB.inbound.index3096.log (Too many open files)
Sent by: "mat-dev" <mat-dev-bounces@xxxxxxxxxxx>

Hi Team, When i tried to process process gz hprof file i got this exception org.eclipse.mat.SnapshotException: Error opening heap dump 'sacbay-m-big77GB.hprof.gz'. Check the error log for further details. at org.eclipse.mat.parser.internal.SnapshotFactoryImpl.parse(SnapshotFactoryImpl.java:331)
Hi Team,

When i tried to process process gz hprof file i got this exception

org.eclipse.mat.SnapshotException: Error opening heap dump 'sacbay-m-big77GB.hprof.gz'. Check the error log for further details.