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Questions tagged [jstat]

A JavaScript statistical library. Also a Java Virtual Machine Statistics Monitoring Tool.

jStat is a JavaScript statistical library. jstat is also a Java Virtual Machine Statistics Monitoring Tool.

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Sun Java jstat does not work .. sometimes !

I frequently use jstat to obtain GC related statistics. However, there are times when I simply cannot obtain any of the statistics from a JVM. It just says that it cannot find the process id, even though its the correct id. Digging slightly deeper,…
souser
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If jstat is deprecated, what should I use instead?

Suddenly I've found out that jstat is deprecated: The jstat tool displays performance statistics for an instrumented HotSpot Java virtual machine (JVM). The target JVM is identified by its virtual machine identifier, or vmid option described…
shabunc
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How to read the output of "jstat -gcutil ?"

I am running a JBoss server and following output belong to -gcutil tool. I am curious what is this abbreviations. /usr/java/jdk1.7.0_25/bin/jstat -gcutil 47929 S0 S1 E O P YGC YGCT FGC FGCT GCT 0.00 …
nuriselcuk
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Full GC - Sun JVM frequency of run

In JDK 1.6 : I see that full GC has been run but the old generation and perm gen space is not used completely - question is as per my understanding FGC only runs when old gen or perm gen is full - I am not able to understand why it has run even…
Anna
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VisualVM over Putty SSH-tunnel

I'm trying to profile remote java app, actually it is a gameserver. It works normally on my local machine (windows XP x64 with JDK1.7.0_02 x64), but behaves very wierd on the production server (CentOS with JDK1.7.0_03 i586). I've done a lot of…
Anton Boritskiy
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Interpreting jstat output after tuning JVM heap size

Having recently attempted to increase the heap space and ratio of new to old gen size I'm seeing confusing results from jstat -gccapacity which is showing much smaller capacities than I would expect. The JVM (1.5.0_16) is started with -server…
SimonC
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How to get non-heap "code cache" details using jstat

I want to find the non-heap memory code cache details of a remote JVM (JDK 8) running on windows from my windows machine. I can get the details using jconsole. But, what i need is to get the values using jstat command. GUI monitoring tools doesn't…
VISHNU
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Find VMID for running instance

I have a webapp running on tomcat and I want to look at garbage collection during runtime using jstat. I have the command: jstat.exe -gc 1000 How can I find what the vmid is?
Sionnach733
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Where to place jstatd.all.policy

I'd like to grant permissions to my jstatd on linux The corresponding manual reads: To use this policy, copy the text into a file called jstatd.all.policy and run the jstatd server as follows: jstatd…
tsds
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Connecting to Java process running as a Windows service: How does JProfiler does it?

How can I connect a trace tool like JvisualVM - not using JMX - to a Java process running as Windows service? The JVM running as service is strted When i start JvisualVM, it does not 'see' the JVM running as service: there are some unanswered…
nir laor
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Can't launch jstat : Could not reserve enough space for object heap

I have an old Jboss server, with 5go of RAM. My java app is configured like that : ...-server -Xms3200m -Xmx3500m -XX:MaxPermSize=512M... When I try to shutdown, it uses the same JAVA_OPTS as the start, so it fail. So I modify the shutdown.sh…
user2178964
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Commands like jps, jstat, jstack, etc show " not found"

I am running Tomcat 9 on an Ubuntu 20.04 OS using OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode). When I try to gather diagnostics info using jstat, jstack, etc, I see PID not found. jps also cannot identify the Tomcat process id. I have…
Shobhana Sriram
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jstat : Survivor and Eden Space capacity decrease over a period

Does anytime java(8) memory capacity decrease until JVM restart? I am using jstat -gc to dump memory information and here is the snapshot from two days. The second snapshot has less captaity for SC1 and EC compared to the first snapshot. Can…
Mallesh
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T-distribution with confidence level in Javascript

What's the jStat function to calculate the t-distribution with a predefined confidence level? jStat.???(1, 0.99) # == 63.67 jStat.???(10, 0.99) # == 3.17 jStat.???(1, 0.95) # == 12.69 http://uregina.ca/~gingrich/tt.pdf
Sig
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Unable to Connect to a Remote JVM using JStat

From the Jstat Documentation , jstat can be connected to a local as well as remote JVM. The URI can be formed as [protocol:][//]lvmid[@hostname[:port]/servername] I have a JVM running on one of the servers (CentOS) with JMX enabled - xyz 23878 …
Sandeep Dharembra
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