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Parameter

cache_size

TypeValue
Value

(warning) This parameter may affect Charon performance. Do not change this parameter until advised by Stromasys

"cache_size" defines the amount of memory in megabytes allocated to the ACE cache.

Default value is 1GB (1024 MB).

Example:

set ace cache_size = 2048

This parameter may be changed for performance optimization in case of some guest OS specific tasks (see the section below).

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Parameter

num_translators

TypeValue
Value

(warning) This parameter may affect Charon performance. Do not change this parameter until advised by Stromasys

"num_translators" defines the number of ACE translators.

Default value in most situations is number of I/O CPUs dedicated to CHARON (defined by "n_of_io_cpus" parameter) minus 1, but in some specific situations it may be set to some other value for better performance.

Example:

set ace num_translators = 4
(warning) Do not change this parameter without clear understanding the purpose.


host_options

Parameter

host_options

TypeText String
Value

(warning) This parameter may affect Charon performance. Do not change this parameter until advised by Stromasys.

"host_options" defines options of ACE (DIT) translator and code-generator. Those options affect Charon perfromanceperformance

Default settings are set to optimize perfromance performance for most geust guest OS (VMS and Tru64) usage profiles. However there are some profiles (for example OpenVMS compilation tasks) where the default settings do not provide optimal perfromanceperformance.

The following switches are available to user:

1. --fixed-variant=[X]

The value X can be one of three options: [-1, 0, 1]. This value defines the desired translation variant. Set -1 for dynamic (default) or 0 or 1 for the fixed number implemented by the translator.

2. --x64-optimize or --x64-nooptimize 

This switch enables translartion optimizations (the default is to optimize).

Example

switch enables translation optimizations (the default is to optimize).

(warning) Default parameters have been changed in Charon version 4.9 compared to previous versions (4.8 and below). If Charon system demonstrates lower performance after upgrade to version 4.9, please test the system with host_options switched to default 4.8 settings:

set ace host_options = "--fixed-variant=0 --x64-nooptimize"

performance degradation may reach about 50% of the version 4.8. In this case the "host_options" switches must be set to the values shown in the example above. Note that in this case the parameter "num_translators" must be set to the number of I/O CPUs dedicated to CHARON (see the "n_of_io_cpus" parameter). Also note that changing parameter "cache_size" can be an alternative solution too (see the section below).(warning) Do not change this parameter without clear understanding the purpose.

Enabling the old style performance optimization

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In this case the following solutions can be applied:

Enlarging ACE

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cache size

Try this solution first. It is recommended to enlarge the ACE cash cache size at least in 2 times as it is shown in the following example:

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RAM  

The CHARON-AXP memory subsystem is permanently loaded and has the logical name "ram".

size

Parametersize
TypeNumeric
ValueSize of the emulated memory in MB.

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HP AlphaStation 200 - 400

set session hw_model=set rom system_name=set ace cpu_architecture=set rom dsrdb[0]=
AlphaServer_400AlphaStation 200 4/100EV41156
AlphaServer_400AlphaStation 200 4/133EV41088
AlphaServer_400AlphaStation 205 4/133EV41250
AlphaServer_400AlphaStation 255 4/133EV41257
AlphaServer_400AlphaStation 200 4/166EV41087
AlphaServer_400AlphaStation 205 4/166EV41251
AlphaServer_400AlphaStation 255 4/166EV41258
AlphaServer_400AlphaStation 400 4/166EV41086
AlphaServer_400AlphaStation 205 4/200EV41252
AlphaServer_400AlphaStation 255 4/200EV41259
AlphaServer_400AlphaStation 200 4/233EV451151
AlphaServer_400AlphaStation 205 4/233EV451253
AlphaServer_400AlphaStation 255 4/233EV451260
AlphaServer_400AlphaStation 400 4/233EV451152
AlphaServer_400AlphaStation 205 4/266EV451254
AlphaServer_400AlphaStation 255 4/266EV451261
AlphaServer_400AlphaServer 300 4/266EV451593
AlphaServer_400AlphaStation 400 4/266EV451153
AlphaServer_400AlphaStation 400 4/266EV451154
AlphaServer_400AlphaStation 200 4/300EV451157
AlphaServer_400AlphaStation 205 4/300EV451255
AlphaServer_400AlphaStation 255 4/300EV451262
AlphaServer_400AlphaStation 400 4/300EV451160
AlphaServer_400AlphaStation 205 4/333EV451256
AlphaServer_400AlphaStation 255 4/333EV451263

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set session hw_model=set rom system_name=set ace cpu_architecture=set rom dsrdb[0]=set rom dsrdb[1]=set rom dsrdb[4]=
AlphaServer_GS80AlphaServer GS80 67/728EV671967

AlphaServer_GS80AlphaServer GS1280EV672038503050

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Setting System Marketing Model (SMM)

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