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‑Xms<size>

Specify the initial heap size, in bytes, of the memory allocation pool.
This value must be a multiple of 1024 greater than 1MB.
Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to indicate gigabytes.

‑Xmx<size>

Specify the maximum heap size, in bytes, of the memory allocation pool.
This value must a multiple of 1024 greater than 2MB.
Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to indicate gigabytes.

‑Xss<size>

Specify the thread stack size.

‑Xrs

Reduces usage of operating-system signals.