Questions tagged [garbage-collecting]
The garbage-collecting tag has no usage guidance.
29
questions
30
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2
answers
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Why does Debian clean php sessions with a cron job instead of using php's built-in garbage collector?
Debian and derivatives (Ubuntu) don't use the php session garbage collector
session.gc_probability = 0
instead they use a cron /etc/cron.d/php5
09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] &...
- 505
7
votes
3
answers
24k
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Tomcat intermittent slowdowns, unresponsive, hangs
I've been trying to track down the cause of intermittent slowdowns of our Tomcat server. We get the slowdowns several times a week, where Tomcat will stop responding or take several minutes to ...
- 73
6
votes
3
answers
10k
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PHP on Windows - ps_files_cleanup_dir error
I am occasionally getting the following error when loading a PHP page:
PHP Notice: session_start(): ps_files_cleanup_dir: opendir(C:\Windows\TEMP) failed: No error (0) in C:\server\default.php on ...
- 163
5
votes
3
answers
7k
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JAVA_OPTS -XX:+PrintGCDetails affect on performance?
Does anyone know if the PrintGCDetails affects java performance much? I've been monitoring our java garbage collecting on a staging server with the same setup as the production server.
I assumed ...
- 512
4
votes
1
answer
821
views
How to disable automatic garbage collection on an SSD?
Solid State Drives (SSD) have a garbage collection functionality which makes space from deleted files available. It is triggered
automatically by the drive
via a TRIM command sent by the OS
Is there ...
- 3,607
3
votes
1
answer
809
views
Monitor the Garbage Collector of an SSD
The SSD controller triggers the garbage collection routines on a specific ship or block when a certain threshold of either invalid pages or written pages is met, based on the GC policy (my guess is ...
- 273
1
vote
1
answer
4k
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GC taking big pause and ParNew (promotion failed)
One of our java application is taking big pause while doing GC, it seems because of "ParNew (promotion failed)" it takes time.
Java version:
$ java -version
java version "1.6.0_21"
Java(TM) SE ...
- 691
1
vote
1
answer
900
views
Possible Linux page table issue/huge load average with large heap JVM that results in significant sys time in GC logs
Our service runs on AWS on m5.12xlarge nodes (48 cores, 192 G RAM) on Ubuntu 16.04. We use Java 8. For our service we allocate about 150G as max heap size. We have no swap on the node. The nature of ...
- 11
1
vote
2
answers
525
views
PHP script causes server shutdown
I have a centos server with 4Gb RAM. I'm doing a PHP console batch process that may take some hours... however it doesn't finish as the server shutdown after 1 or 2 hours from lauching the process... ...
- 11
1
vote
1
answer
3k
views
High CPU utilisation w3wp.exe - GC issue?
I've inherited a website that uses a lot of session state. We've recently experienced continuous high CPU ~95-100% for prolonged period of times.
When debugging using DebugDiag, it shows that there ...
- 121
1
vote
3
answers
4k
views
Why are Full GCs not running on my gcInterval I set?
ColdFusion 10 Update 10
Windows Server 2008 R2
Java 1.7.0_21
I am trying to figure Full GCs to run every 10 minutes. I have used the gcInterval JVM arg in the past on earlier versions of ColdFusion ...
- 180
1
vote
2
answers
2k
views
Periodic unresponsiveness in tomcat
I am experiencing periodic unresponsiveness in tomcat in our production environment. I cannot reproduce this in a test environment, and nothing appears in the logs prior to or during the event. ...
- 13
1
vote
1
answer
213
views
is it safe for the Apache to be the owner of the session directory (php)
Since I have upgraded to php 5.3 I have issues with the session GC.
Seems he can't access the directory which is owned by root, Although I see sessions are being created there.
Is it safe to change ...
1
vote
0
answers
390
views
What could cause Ruby's free heap slots to rapidly increase?
I'm diagnosing why our Rails servers seem to leak memory.
In looking at New Relic today, I noticed that "Free heap slots" of our Ruby VMs seems to jump from almost nothing up to the baseline level of ...
- 131
1
vote
1
answer
5k
views
JVM crash with segmentation fault
We have a cluster of tomcat servers, just upgraded to debian7/openjdk7/tomcat7 (all from stock debian). Now we had two JVM crash on different machines. Both servers having identical hardware and are ...
- 1,431
0
votes
1
answer
1k
views
WebLogic server seems to freeze after CMS Garbage Collection run
We're using Java Hotspot 1.6 with a 10.3.6 WebLogic Cluster with 2 nodes running OSB 11.1.1.7 behind a physical load balancer:
java version "1.6.0_91"
Java(TM) SE Runtime Environment (build 1.6.0_91-...
- 21
0
votes
1
answer
599
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JVM garbage collection: What is the difference between "survivor 1" and "survivor 2"?
In Oracle's Java Virtual Machine's Garbage Collector, what are the respective roles of "survivor 1" and "survivor 2" ?
Are the objects always moving like: Eden → Survivor 1 → Survivor 2
Or can an ...
- 1,334
0
votes
1
answer
1k
views
Why is the max heap much smaller than the value I set in Xmx (with -XX:+UseParallelGC -XX:+UseParallelOldGC)
I am running a SolrCloud on k8s with the following setting:
Heap params:
-server -Xms280m -Xmx312m
Other params:
-XX:+UseParallelGC -XX:+UseParallelOldGC -XX:+UseAdaptiveSizePolicy -XX:...
0
votes
1
answer
447
views
Monitoring Java garbage collector and memory status
I'm running some Rails applications on Jboss with JRuby.
Sometimes the Java garbage collector can't free memory and the jvm consume all the available memory.
I'm trying to create a custom metric ...
- 649
0
votes
1
answer
3k
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Tomcat CPU and GC going crazy [closed]
Having some major issues with our Tomcat 7 installation. It used to run fine for over a year, but now the CPU is mainly at 400% - 700% (8 core machine) and in the logs I see tones of these:
2015-04-...
- 111
0
votes
1
answer
1k
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When the JVM is doing a complete GC, is it expected to see a large number of page fault/sec?
It is Window 2003 server.
We are running some performance test, and what we see is:
1. In first 5 hours, the page fault/sec is very small, like 10 or 20
In the last 1 hour, the page fault jumps to ...
- 147
0
votes
3
answers
2k
views
Frequent occurence of FULL GC
There is a frequent occurence of FULL GC in our system.
We are using Java application running on Tomcat server. Our application is running using internal load balancer setup.
We are seeing lot of ...
- 1
0
votes
0
answers
126
views
PowerShell ForEach-Object Parallel RAM Memory Keeps Growing
Using PS 7.3.4
The code works fine without errors.
Issue - the RAM consumed by the script keeps growing. How do I release the RAM? How do I see what is consuming the RAM? Any suggestions will be ...
- 493
0
votes
1
answer
496
views
PHP5 to PHP7 unexpected increase in memory usage inside container
Last week we updated several wordpress sites which are running Alpine Linux as containers inside a host (Ubuntu 20.04) through LXD.
A summary of the update is as follows:
Alpine Linux v3.8 -> 3.14
...
- 469
0
votes
1
answer
1k
views
tomcat8: 'free(): corrupted unsorted chunks'
We upgraded from Ubuntu 16LTS to Ubuntu 18LTS a couple of days ago and since then have had Apache Tomcat crash completely twice (once per day, about 25 hrs apart). The java process stops running.
One ...
- 101
0
votes
0
answers
228
views
Tomcat 7 server experiencing a sudden (order of magnitude) increase of the Young GC frequency after upgrade of Ubuntu and OpenJDK
What is the issue?
After upgrading instances to Ubuntu 16.04 LTS and OpenJDK 8 the GC frequency can, after hours of normal operation, suddenly increase by orders of magnitude ending up using less ...
0
votes
1
answer
55
views
Discrepancy in java Garabage Collection between jconsole and log files
I'm having an odd problem: my garbage collection log file (as defined by -Xloggc) will show n number of garbage collections have taken place, but jconsole will show n+6 garbage collections have taken ...
- 153
-1
votes
1
answer
80
views
Empty LAMP Sessions [closed]
I have a LAMP server. Users log in and authenticate against the MySQL database. After successful authentication, session_start() is called. At no point is regenerate_session_id() called. I'm ...
- 1
-1
votes
1
answer
3k
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High CPU being caused by garbage collection in w3wp.exe [closed]
I am having a problem with High CPU happening on my my website in IIS8. This happens randomly and not very often but it does happen especially when the load is heavy on the site. The only way to ...
- 283