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/*
* Created on Wednesday, July 13 2011 00:50
*/
package com.jogamp.opencl;
import com.jogamp.opencl.llb.CL;
import static com.jogamp.opencl.llb.CL.*;
/**
* A subdevice created through device fission.
* A subdevice can be used like any other device but must be released if no longer needed.
* <p>
* possible usecases for device fission:
* <ul>
* <li> To reserve part of the device for use for high priority / latency-sensitive tasks </li>
* <li> To more directly control the assignment of work to individual compute units </li>
* <li> To subdivide compute devices along some shared hardware feature like a cache </li>
* </ul>
* </p>
* @see CLDevice#createSubDevicesEqually(int)
* @see CLDevice#createSubDevicesByCount(int[])
* @see CLDevice#createSubDeviceByIndex(int[])
* @see CLDevice#createSubDevicesByDomain(com.jogamp.opencl.CLSubDevice.AffinityDomain)
* @author Michael Bien
*/
public class CLSubDevice extends CLDevice implements CLResource {
private volatile boolean released;
private final CLDevice parent;
private CLSubDevice(CLDevice parent, CLContext context, long id) {
super(context, id);
this.parent = parent;
}
private CLSubDevice(CLDevice parent, CLPlatform platform, long id) {
super(platform, id);
this.parent = parent;
}
static CLSubDevice createSubDevice(CLDevice device, long id) {
if(device.context == null) {
return new CLSubDevice(device, device.getPlatform(), id);
}else{
return new CLSubDevice(device, device.getContext(), id);
}
}
/**
* Returns the parent device which may be a CLDevice or another CLSubDevice.
*/
public CLDevice getParent() {
return parent;
}
@Override
public void release() {
if(released) {
throw new RuntimeException("already released");
}
released = true;
CL cl = CLPlatform.getLowLevelCLInterface();
int ret = cl.clReleaseDeviceEXT(ID);
CLException.checkForError(ret, "release failed");
}
@Override
public boolean isReleased() {
return released;
}
@Override
public boolean isSubDevice() {
return true;
}
/**
* Sub device affinity domains.
* @see CLDevice#createSubDevicesByDomain(com.jogamp.opencl.CLSubDevice.AffinityDomain)
*/
public enum AffinityDomain {
L1_CACHE(CL_AFFINITY_DOMAIN_L1_CACHE_EXT),
L2_CACHE(CL_AFFINITY_DOMAIN_L2_CACHE_EXT),
L3_CACHE(CL_AFFINITY_DOMAIN_L3_CACHE_EXT),
L4_CACHE(CL_AFFINITY_DOMAIN_L4_CACHE_EXT),
NUMA(CL_AFFINITY_DOMAIN_NUMA_EXT),
NEXT_FISSIONABLE(CL_AFFINITY_DOMAIN_NEXT_FISSIONABLE_EXT);
/**
* Value of wrapped OpenCL value.
*/
public final int TYPE;
private AffinityDomain(int type) {
this.TYPE = type;
}
/**
* Returns the matching AffinityDomain for the given cl flag.
*/
public static AffinityDomain valueOf(int domain) {
AffinityDomain[] values = AffinityDomain.values();
for (AffinityDomain value : values) {
if(value.TYPE == domain)
return value;
}
return null;
}
}
/**
* Sub device partition styles.
* @see CLDevice#getPartitionTypes()
*/
public enum Partition {
/**
* @see CLDevice#createSubDevicesEqually(int)
*/
EQUALLY(CL_DEVICE_PARTITION_EQUALLY_EXT),
/**
* @see CLDevice#createSubDevicesByCount(int[])
*/
COUNTS(CL_DEVICE_PARTITION_BY_COUNTS_EXT),
/**
* @see CLDevice#createSubDeviceByIndex(int[])
*/
NAMES(CL_DEVICE_PARTITION_BY_NAMES_EXT),
/**
* @see CLDevice#createSubDevicesByDomain(com.jogamp.opencl.CLSubDevice.AffinityDomain)
*/
DOMAIN(CL_DEVICE_PARTITION_BY_AFFINITY_DOMAIN_EXT);
/**
* Value of wrapped OpenCL value.
*/
public final int FLAG;
private Partition(int type) {
this.FLAG = type;
}
/**
* Returns the matching AffinityDomain for the given cl flag.
*/
public static Partition valueOf(int domain) {
Partition[] values = Partition.values();
for (Partition value : values) {
if(value.FLAG == domain)
return value;
}
return null;
}
}
}
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