Rmm#

public class Rmm#

This is the binding class for rmm lib.

Field Summary

`readLock`
`writeLock`

Method Summary

`alloc(long size)`	Allocate device memory and return a pointer to device memory, using stream 0.
`alloc(long size, Cuda.Stream stream)`	Allocate device memory and return a pointer to device memory.
`allocCuda(long size, Cuda.Stream stream)`	Allocate device memory using cudaMalloc and return a pointer to device memory.
`allocFromFallbackPinnedPool(long size)`
`allocFromPinnedPool(long poolPtr, long size)`
`cleanupDefaultCudaDevice()`
`clearEventHandler()`	Clears the active RMM event handler if one is set.
`configureDefaultCudfPinnedPoolSize(long size)`	Sets the size of the cuDF default pinned pool.
`freeFromFallbackPinnedPool(long ptr, long size)`
`freeFromPinnedPool(long poolPtr, long ptr, long size)`
`getCurrentDeviceResource()`	Get the RmmDeviceMemoryResource that was last set through the java APIs.
`getMaximumTotalBytesAllocated()`	Returns the maximum amount of RMM memory (Bytes) outstanding during the lifetime of the process.
`getPoolSize()`	Get the most recently set pool size or -1 if RMM has not been initialized or pooling is not enabled.
`getScopedMaximumBytesAllocated()`	Returns the maximum amount of RMM memory (Bytes) outstanding since the last resetScopedMaximumOutstanding call was issued (it is “scoped” because it’s the maximum amount seen since the last reset).
`getTotalBytesAllocated()`	Return the amount of RMM memory allocated in bytes.
`getTracker()`	Get the currently set RmmTrackingResourceAdaptor that is set.
`initDefaultCudaDevice()`
`initialize(int allocationMode, LogConf logConf, long poolSize)`	Initialize memory manager state and storage.
`isInitialized()`	Check if RMM has been initialized already or not.
`isPoolingEnabled()`	Return true if rmm is initialized and pooling has been enabled, else false.
`logTo(File location)`	Create a config that will write alloc/free logs to a file.
`logToStderr()`	Create a config that will write alloc/free logs to stderr.
`logToStdout()`	Create a config that will write alloc/free logs to stdout.
`newPinnedPoolMemoryResource(long initSize, long maxSize)`
`releasePinnedPoolMemoryResource(long poolPtr)`
`resetScopedMaximumBytesAllocated()`	Resets a scoped maximum counter of RMM memory used to keep track of usage between code sections while debugging.
`resetScopedMaximumBytesAllocated(long initialValue)`	Resets a scoped maximum counter of RMM memory used to keep track of usage between code sections while debugging.
`setCudfPinnedPoolMemoryResource(long poolPtr)`
`setCurrentDeviceResource(RmmDeviceMemoryResource newResource, RmmDeviceMemoryResource expectedResource, boolean forceChange)`	Set the current device resource that RMM should use for all allocations and de-allocations.
`setEventHandler(RmmEventHandler handler)`	Sets the event handler to be called on RMM events (e.g.: allocation failure).
`setEventHandler(RmmEventHandler handler, boolean enableDebug)`	Sets the event handler to be called on RMM events (e.g.: allocation failure) and optionally enable debug mode (callbacks on every allocate and deallocate).
`shutdown()`	Shut down any initialized RMM instance.
`shutdown(long forceGCInterval, long maxWaitTime, TimeUnit units)`	Shut down any initialized RMM instance.

Static Fields

public static final Lock readLock#

public static final Lock writeLock#

Static Methods

public static LogConf logTo(File location)#: Create a config that will write alloc/free logs to a file.

public static LogConf logToStdout()#: Create a config that will write alloc/free logs to stdout.

public static LogConf logToStderr()#: Create a config that will write alloc/free logs to stderr.

public static RmmDeviceMemoryResource getCurrentDeviceResource()#

Get the RmmDeviceMemoryResource that was last set through the java APIs.

This will not return the correct value if the resource was not set using the java APIs. It will return a null if the resource was never set through the java APIs.

public static RmmTrackingResourceAdaptor<RmmDeviceMemoryResource> getTracker( )#

Get the currently set RmmTrackingResourceAdaptor that is set.

This might return null if RMM has nto been initialized.

public static RmmDeviceMemoryResource setCurrentDeviceResource( RmmDeviceMemoryResource newResource, RmmDeviceMemoryResource expectedResource, boolean forceChange )#

Set the current device resource that RMM should use for all allocations and de-allocations.

This should only be done if you feel comfortable that the current device resource has no pending allocations. Note that the caller of this is responsible for closing the current RmmDeviceMemoryResource that is returned by this. Assuming that it was not used to create the newResource. Please use the shutdown API to clear the resource as it does best effort clean up before shutting it down. If newResource is not null this will initialize the CUDA context for the calling thread if it is not already set. The caller is responsible for setting the desired CUDA device prior to this call if a specific device is already set.

NOTE: All cudf methods will set the chosen CUDA device in the CUDA context of the calling thread after this returns and newResource was not null.

If newResource is null this will unset the default CUDA device and mark RMM as not initialized.

Be aware that for many of these APIs to work the RmmDeviceMemoryResource will need an RmmTrackingResourceAdaptor. If one is not found and newResource is not null it will be added to newResource.

Also be very careful with how you set this up. It is possible to set up an RmmDeviceMemoryResource that is just bad, like multiple pools or pools on top of an RmmAsyncMemoryResource, that does pooling already. Unless you know what you are doing it is best to just use the initialize API instead.

Parameters:

newResource – the new resource to set. If it is null an RmmCudaMemoryResource will be used, and RMM will be set as not initialized.
expectedResource – the resource that we expect to be set. This is to let us avoid race conditions with multiple things trying to set this at once. It should never happen, but just to be careful.
forceChange – if true then the expectedResource check is not done.

public static void initialize( int allocationMode, LogConf logConf, long poolSize ) throws RmmException #

Initialize memory manager state and storage.

This will always initialize the CUDA context for the calling thread if it is not already set. The caller is responsible for setting the desired CUDA device prior to this call if a specific device is already set.

NOTE: All cudf methods will set the chosen CUDA device in the CUDA context of the calling thread after this returns.

Parameters:

allocationMode – Allocation strategy to use. Bit set using RmmAllocationMode.CUDA_DEFAULT, RmmAllocationMode.POOL, RmmAllocationMode.ARENA, RmmAllocationMode.CUDA_ASYNC, RmmAllocationMode.CUDA_ASYNC_FABRIC and RmmAllocationMode.CUDA_MANAGED_MEMORY
logConf – How to do logging or null if you don’t want to
poolSize – The initial pool size in bytes

Throws:

IllegalStateException – if RMM has already been initialized

public static boolean configureDefaultCudfPinnedPoolSize(long size)#

Sets the size of the cuDF default pinned pool.

Note

This has to be called before cuDF functions are executed.

Parameters:: size – initial and maximum size for the cuDF default pinned pool. Pass size=0 to disable the default pool.
Returns:: true if we were able to setup the default resource, false if there was a resource already set.

public static long getPoolSize()#: Get the most recently set pool size or -1 if RMM has not been initialized or pooling is not enabled.

public static boolean isPoolingEnabled()#: Return true if rmm is initialized and pooling has been enabled, else false.

public static boolean isInitialized() throws RmmException #: Check if RMM has been initialized already or not.

public static long getTotalBytesAllocated()#

Return the amount of RMM memory allocated in bytes.

Note that the result may be less than the actual amount of allocated memory if underlying RMM allocator decides to return more memory than what was requested. However, the result will always be a lower bound on the amount allocated.

public static long getMaximumTotalBytesAllocated()#: Returns the maximum amount of RMM memory (Bytes) outstanding during the lifetime of the process.

public static void resetScopedMaximumBytesAllocated(long initialValue)#

Resets a scoped maximum counter of RMM memory used to keep track of usage between code sections while debugging.

Parameters:: initialValue – an initial value (in Bytes) to use for this scoped counter

public static void resetScopedMaximumBytesAllocated()#

Resets a scoped maximum counter of RMM memory used to keep track of usage between code sections while debugging.

This resets the counter to 0 Bytes.

public static long getScopedMaximumBytesAllocated()#

Returns the maximum amount of RMM memory (Bytes) outstanding since the last resetScopedMaximumOutstanding call was issued (it is “scoped” because it’s the maximum amount seen since the last reset).

If the memory used is net negative (for example if only frees happened since reset, and we reset to 0), then result will be 0.

If resetScopedMaximumBytesAllocated is never called, the scope is the whole program and is equivalent to getMaximumTotalBytesAllocated.

Returns:: the scoped maximum bytes allocated

public static void setEventHandler( RmmEventHandler handler ) throws RmmException #

Sets the event handler to be called on RMM events (e.g.: allocation failure).

Parameters:: handler – event handler to invoke on RMM events or null to clear an existing handler
Throws:: RmmException – if an active handler is already set

public static void setEventHandler( RmmEventHandler handler, boolean enableDebug ) throws RmmException #

Sets the event handler to be called on RMM events (e.g.: allocation failure) and optionally enable debug mode (callbacks on every allocate and deallocate).

NOTE: Only enable debug mode when necessary, as code will run much slower!

Parameters:

handler – event handler to invoke on RMM events or null to clear an existing handler
enableDebug – if true enable debug callbacks in RmmEventHandler (onAllocated, onDeallocated)

Throws:

RmmException – if an active handler is already set

public static void clearEventHandler() throws RmmException #: Clears the active RMM event handler if one is set.

public static void initDefaultCudaDevice()#

public static void cleanupDefaultCudaDevice()#

public static void shutdown() throws RmmException #

Shut down any initialized RMM instance.

This should be used very rarely. It does not need to be used when shutting down your process because CUDA will handle releasing all of the resources when your process exits. This really should only be used if you want to turn off the memory pool for some reasons. As such we make an effort to be sure no resources have been leaked before shutting down. This may involve forcing a JVM GC to collect any leaked java objects that still point to CUDA memory. By default this will do a gc every 2 seconds and wait for up to 4 seconds before throwing an RmmException if not all of the resources are freed.

Throws:: RmmException – on any error. This includes if there are outstanding allocations that could not be collected.

public static void shutdown( long forceGCInterval, long maxWaitTime, TimeUnit units ) throws RmmException #

Shut down any initialized RMM instance.

Parameters:

forceGCInterval – how frequently should we force a JVM GC. This is just a recommendation to the JVM to do a gc.
maxWaitTime – the maximum amount of time to wait for all objects to be collected before throwing an exception.
units – the units for forceGcInterval and maxWaitTime.

Throws:

RmmException – on any error. This includes if there are outstanding allocations that could not be collected before maxWaitTime.

public static DeviceMemoryBuffer alloc(long size)#

Allocate device memory and return a pointer to device memory, using stream 0.

Parameters:: size – The size in bytes of the allocated memory region
Returns:: Returned pointer to the allocated memory

public static DeviceMemoryBuffer alloc(long size, Cuda.Stream stream)#

Allocate device memory and return a pointer to device memory.

Parameters:

size – The size in bytes of the allocated memory region
stream – The stream in which to synchronize this command.

Returns:

Returned pointer to the allocated memory

public static CudaMemoryBuffer allocCuda( long size, Cuda.Stream stream )#

Allocate device memory using cudaMalloc and return a pointer to device memory.

Parameters:

size – The size in bytes of the allocated memory region
stream – The stream in which to synchronize this command.

Returns:

Returned pointer to the allocated memory

public static long newPinnedPoolMemoryResource( long initSize, long maxSize )#

public static long setCudfPinnedPoolMemoryResource(long poolPtr)#

public static void releasePinnedPoolMemoryResource(long poolPtr)#

public static long allocFromPinnedPool(long poolPtr, long size)#

public static void freeFromPinnedPool( long poolPtr, long ptr, long size )#

public static long allocFromFallbackPinnedPool(long size)#

public static void freeFromFallbackPinnedPool(long ptr, long size)#

public static class LogConf#: What to send RMM alloc and free logs to.