Why the extremely large default value MaxDirectMemorySize=1048576g at start-up?

[BK BK]

Hi Everyone,

I have a question, in 2 parts. It concerns the start-up file Terracotta\server\bin\start-tc-server.bat.

1) Is the unit "g" for MaxDirectMemorySize in Gigabyte?

2) If so, why is it so enormous (1048576g)?

You will find the code involved below.

Thanks.

Stay safe. Stay well.

================= Code excerpt =============

for %%C in ("\bin\java -d64 -server -XX:MaxDirectMemorySize=1048576g" "\bin\java -server -XX:MaxDirectMemorySize=1048576g" "\bin\java -d64 -client  -XX:MaxDirectMemorySize=1048576g" "\bin\java -client -XX:MaxDirectMemorySize=1048576g" "\bin\java -XX:MaxDirectMemorySize=1048576g") do (

  set JAVA_COMMAND=%JAVA_HOME%%%~C

  %JAVA_HOME%%%~C -version > NUL 2>&1

  if not errorlevel 1 (

    goto found_command

  )

)

[BK BK]

By the way, my version is 4.3.6

[chris.w...@gmail.com]

MaxDirectMemorySize is just a limit on how much direct memory the JVM can allocate. Since Terracotta users have vastly different resource needs the start script simply sets the MaxDirectMemorySize high enough that it isn't a limiting factor in any deployment. Specifically this setting has no bearing on how much memory the JVM actually allocates.

Chris

[BK BK]

Hi Chris, 

Thanks for your reply.

Nevertheless, my question remains unanswered: "Is the unit "g" for MaxDirectMemorySize in Gigabyte? If so, why is it so enormous (1048576g)?"

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