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OFF: no DIT optimization.
Client JIT or first level DIT: this is the equivalent of the DIT optimization available in older versions.
Server JIT or second level DIT: this is a more aggressive optimization. It optimizes SPARC instructions at runtime based on an MRU policy (Most Recently Used).
Server JIT is only not available in Charon-SSP/4U(+)4M. Client and server JIT are implemented in two separate images that will be configured automatically by Charon-SSP Manager depending on the configuration.
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Virtual machine client JIT configuration fields | |
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| Field | Description |
Virtualization Mode | Emulation selects the Charon-SSP/4U emulator, Intel VT-x/EPT informs the manager that the hardware prerequisites for running Charon-SSP/4U+ or Charon-SSP/4V+ are met. <what about 4V?> This option is inactive on Charon-SSP/4M or if Charon-SSP/4U+ is not installed. Attempting to run Charon-SSP/4U+ on insufficient hardware will cause the instance to exit with an error message. For example, Check if your AWS instance runs on dedicated hardware if you encounter such errors. |
DIT Optimization | This option controls the Dynamic Instruction Translation (DIT). DIT is a just in time compilation technology to dynamically optimize the SPARC instruction execution on x86-64 platforms. It can be set to OFF, Client JIT, or Server JIT (Charon-4U/4V only). The remainder of this table describes the Client JIT parameters. |
DIT page size | This option controls the size of the translation buffer holding the translated binary code that results from the DIT optimization. It can be increased to a maximum of 2048KB. This parameter should only be changed if the log file indicates that the DIT optimization was disabled because the translation buffer size was too small. This option is available on Charon-SSP/4U(+) and Charon-SSP/4V only. |
FP boost ratio | Defines the level of floating-point optimization. The parameter can be set to a value from 0 to 100. The default is 0 (= no boost). This option is available on Charon-SSP/4U(+) and Charon-SSP/4V only. |
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Virtual machine server JIT configuration fields | |
|---|---|
| Field | Description |
Virtualization Mode | Emulation selects the Charon-SSP/4U emulator, Intel VT-x/EPT informs the manager that the hardware prerequisites for running Charon-SSP/4U+ or Charon-SSP/4V+ are met. <what about 4V?> This option is inactive on Charon-SSP/4M or if Charon-SSP/4U+ is not installed. Attempting to run Charon-SSP/4U+ on insufficient hardware will cause the instance to exit with an error message. For example, Check if your AWS instance runs on dedicated hardware if you encounter such errors. |
DIT Optimization | This option controls the Dynamic Instruction Translation (DIT). DIT is a just in time compilation technology to dynamically optimize the SPARC instruction execution on x86-64 platforms. It can be set to OFF, Client JIT, or Server JIT (Charon-SSP/4U only). The remainder of this table describes the Server JIT parameters (only available on Charon-SSP/4U and 4V). |
DIT page size | This option controls the size of the translation buffer holding the translated binary code that results from the DIT optimization. It can be increased to a maximum of 2048KB. This parameter should only be changed if the log file indicates that the DIT optimization was disabled because the translation buffer size was too small |
DIT code cache | Size of cache between 1024MB and 8192MB in steps of 1024MB. |
FP boost ratio | Defines the level of floating-point optimization. The parameter can be set to a value from 0 to 100. The default is 0 (= no boost). |
INT boost ratio | Defines the level of integer operation optimization. The parameter can be set to a value from 0 to 100. The default is 100 (= maximum boost). The higher the value the more resources are required. Hence high values are likely to provide most benefit if the guest system applications run for a long time. |
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