Constraints

This section provides a detailed information about all the supported constraints by the COMPSs runtime for Java, Python and C/C++ languages. The constraints are defined as key-value pairs, where the key is the name of the constraint. Table 14 details the available constraints names for Java, Python and C/C++, its value type, its default value and a brief description.

Table 14 Arguments of the *@constraint* decorator
Java	Python	C / C++	Value type	Default value	Description
computingUnits	computing_units	ComputingUnits	$<$ string $>$	“1”	Required number of computing units
processorName	processor_name	ProcessorName	$<$ string $>$	“[unassigned]”	Required processor name
processorSpeed	processor_speed	ProcessorSpeed	$<$ string $>$	“[unassigned]”	Required processor speed
processorArchitecture	processor_architecture	ProcessorArchitecture	$<$ string $>$	“[unassigned]”	Required processor architecture
processorType	processor_type	ProcessorType	$<$ string $>$	“[unassigned]”	Required processor type
processorPropertyName	processor_property_name	ProcessorPropertyName	$<$ string $>$	“[unassigned]”	Required processor property
processorPropertyValue	processor_property_value	ProcessorPropertyValue	$<$ string $>$	“[unassigned]”	Required processor property value
processorInternalMemorySize	processor_internal_memory_size	ProcessorInternalMemorySize	$<$ string $>$	“[unassigned]”	Required internal device memory
processors	processors		List $<$ @Processor $>$	“{}”	Required processors (check Table 15 for Processor details)
memorySize	memory_size	MemorySize	$<$ string $>$	“[unassigned]”	Required memory size in GBs
memoryType	memory_type	MemoryType	$<$ string $>$	“[unassigned]”	Required memory type (SRAM, DRAM, etc.)
storageSize	storage_size	StorageSize	$<$ string $>$	“[unassigned]”	Required storage size in GBs
storageType	storage_type	StorageType	$<$ string $>$	“[unassigned]”	Required storage type (HDD, SSD, etc.)
operatingSystemType	operating_system_type	OperatingSystemType	$<$ string $>$	“[unassigned]”	Required operating system type (Windows, MacOS, Linux, etc.)
operatingSystemDistribution	operating_system_distribution	OperatingSystemDistribution	$<$ string $>$	“[unassigned]”	Required operating system distribution (XP, Sierra, openSUSE, etc.)
operatingSystemVersion	operating_system_version	OperatingSystemVersion	$<$ string $>$	“[unassigned]”	Required operating system version
wallClockLimit	wall_clock_limit	WallClockLimit	$<$ string $>$	“[unassigned]”	Maximum wall clock time
hostQueues	host_queues	HostQueues	$<$ string $>$	“[unassigned]”	Required queues
appSoftware	app_software	AppSoftware	$<$ string $>$	“[unassigned]”	Required applications that must be available within the remote node for the task

All constraints are defined with a simple value except the HostQueue and AppSoftware constraints, which allow multiple values.

The processors constraint allows the users to define multiple processors for a task execution. This constraint is specified as a list of @Processor annotations that must be defined as shown in Table 15

Table 15 Arguments of the *@Processor* decorator
Annotation	Value type	Default value	Description
processorType	$<$ string $>$	“CPU”	Required processor type (e.g. CPU or GPU)
computingUnits	$<$ string $>$	“1”	Required number of computing units
name	$<$ string $>$	“[unassigned]”	Required processor name
speed	$<$ string $>$	“[unassigned]”	Required processor speed
architecture	$<$ string $>$	“[unassigned]”	Required processor architecture
propertyName	$<$ string $>$	“[unassigned]”	Required processor property
propertyValue	$<$ string $>$	“[unassigned]”	Required processor property value
internalMemorySize	$<$ string $>$	“[unassigned]”	Required internal device memory