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Mat Linux Command Line Usage with Discard Feature [message #1842128]

Wed, 09 June 2021 18:54

Louis Johnson

Messages: 2
Registered: June 2021

Junior Member

Hello, all! I am trying to parse a relatively large heap dump file ~100G. Due to the long size limit, we will need to use the discard feature. We are trying the feature with command line with no luck so far. Here is the MemoryAnalyzer.ini setting we have

###
-startup
plugins/org.eclipse.equinox.launcher_1.5.700.v20200207-2156.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.gtk.linux.x86_64_1.1.1100.v20190907-0426
-discard_enable=true
-discard_ratio=100
-discard_pattern="java\\."
-vmargs
-Xmx220g
-XX:+UseStringDeduplication
###

Do we miss anything here? Thank you!

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Re: Mat Linux Command Line Usage with Discard Feature [message #1842216 is a reply to message #1842128]

Sat, 12 June 2021 08:27

Andrew Johnson

Messages: 205
Registered: July 2009

Senior Member

That looks roughly right.
I hadn't considered having the options in the ini file rather than as arguments to ParseHeapDump.sh but I think it might work. [For Windows then as the executable in ParseHeapDump.bat is

eclipsec.exe

the ini file would need to be

eclipsec.ini

.]

If it is working then in you should see a message (on the command line or in the error log) like:

[WARNING] Discarded 95,860 objects taking 3,308,160 bytes because of discard ratio 100% with pattern java.*

I think the trouble may be in the

-discard_pattern="java\\."

There's no wildcard

.*

at the end so that won't match anything.
The double quotes might not be removed, so for the ini file I would remove the double quotes. I'm not sure how command line processing of backslash works so perhaps using