ai.rapids.cudf

Class Rmm

java.lang.Object

ai.rapids.cudf.Rmm

public class Rmm
extends Object

This is the binding class for rmm lib.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Rmm.LogConf What to send RMM alloc and free logs to.

Constructor Summary

Constructors

Constructor and Description
Rmm()

Method Summary

Modifier and Type	Method and Description
static DeviceMemoryBuffer	alloc(long size) Allocate device memory and return a pointer to device memory, using stream 0.
static DeviceMemoryBuffer	alloc(long size, Cuda.Stream stream) Allocate device memory and return a pointer to device memory.
static CudaMemoryBuffer	allocCuda(long size, Cuda.Stream stream) Allocate device memory using `cudaMalloc` and return a pointer to device memory.
static void	clearEventHandler() Clears the active RMM event handler if one is set.
static long	getMaximumTotalBytesAllocated() Returns the maximum amount of RMM memory (Bytes) outstanding during the lifetime of the process.
static long	getPoolSize() Get the most recently set pool size or -1 if RMM has not been initialized or pooling is not enabled.
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).
static long	getTotalBytesAllocated() Return the amount of RMM memory allocated in bytes.
static void	initialize(int allocationMode, Rmm.LogConf logConf, long poolSize) Initialize memory manager state and storage.
static boolean	isInitialized() Check if RMM has been initialized already or not.
static boolean	isPoolingEnabled() Return true if rmm is initialized and pooling has been enabled, else false.
static Rmm.LogConf	logTo(File location) Create a config that will write alloc/free logs to a file.
static Rmm.LogConf	logToStderr() Create a config that will write alloc/free logs to stderr.
static Rmm.LogConf	logToStdout() Create a config that will write alloc/free logs to stdout.
static void	resetScopedMaximumBytesAllocated() Resets a scoped maximum counter of RMM memory used to keep track of usage between code sections while debugging.
static void	resetScopedMaximumBytesAllocated(long initialValue) Resets a scoped maximum counter of RMM memory used to keep track of usage between code sections while debugging.
static void	setEventHandler(RmmEventHandler handler) Sets the event handler to be called on RMM events (e.g.: allocation failure).
static void	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) NOTE: Only enable debug mode when necessary, as code will run much slower!
static void	shutdown() Shut down any initialized RMM instance.
static void	shutdown(long forceGCInterval, long maxWaitTime, TimeUnit units) Shut down any initialized RMM instance.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Rmm

public Rmm()

Method Detail

logTo

public static Rmm.LogConf logTo(File location)

Create a config that will write alloc/free logs to a file.

logToStdout

public static Rmm.LogConf logToStdout()

Create a config that will write alloc/free logs to stdout.

logToStderr

public static Rmm.LogConf logToStderr()

Create a config that will write alloc/free logs to stderr.

initialize

public static void initialize(int allocationMode,
                              Rmm.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 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

RmmException

getPoolSize

public static long getPoolSize()

Get the most recently set pool size or -1 if RMM has not been initialized or pooling is not enabled.

isPoolingEnabled

public static boolean isPoolingEnabled()

Return true if rmm is initialized and pooling has been enabled, else false.

isInitialized

public static boolean isInitialized()
                             throws RmmException

Check if RMM has been initialized already or not.

Throws:

RmmException

getTotalBytesAllocated

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.

getMaximumTotalBytesAllocated

public static long getMaximumTotalBytesAllocated()

Returns the maximum amount of RMM memory (Bytes) outstanding during the lifetime of the process.

resetScopedMaximumBytesAllocated

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

resetScopedMaximumBytesAllocated

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.

getScopedMaximumBytesAllocated

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

setEventHandler

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

setEventHandler

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

clearEventHandler

public static void clearEventHandler()
                              throws RmmException

Clears the active RMM event handler if one is set.

Throws:

RmmException

shutdown

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.

shutdown

public static void shutdown(long forceGCInterval,
                            long maxWaitTime,
                            TimeUnit units)
                     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.

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.

alloc

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

alloc

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

allocCuda

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