org.apache.sysml.runtime.instructions.gpu.context

Class GPUContextPool

java.lang.Object

org.apache.sysml.runtime.instructions.gpu.context.GPUContextPool

public class GPUContextPool
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static String	AVAILABLE_GPUS GPUs to use, can specify -1 to use all, comma separated list of GPU numbers, a specific GPU or a range
protected static org.apache.commons.logging.Log	LOG

Constructor Summary

Constructors

Constructor and Description
GPUContextPool()

Method Summary

Modifier and Type	Method and Description
static void	freeAllGPUContexts() Unreserves all GPUContexts
static int	getAvailableCount() Get the number of free GPUContexts
static int	getDeviceCount() Number of available devices on this machine
static long	initialGPUMemBudget() Gets the initial GPU memory budget.
static void	initializeGPU() Static initialization of the number of devices Also sets behaviour for J{Cuda, Cudnn, Cublas, Cusparse} in case of error Initializes the CUDA driver All these need be done once, and not per GPU
static ArrayList<Integer>	parseListString(String str, int max) Parses a string into a list.
static List<GPUContext>	reserveAllGPUContexts() Reserves and gets an initialized list of GPUContexts

Methods inherited from class java.lang.Object

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

Field Detail

LOG

protected static final org.apache.commons.logging.Log LOG

AVAILABLE_GPUS

public static String AVAILABLE_GPUS

GPUs to use, can specify -1 to use all, comma separated list of GPU numbers, a specific GPU or a range

Constructor Detail

GPUContextPool

public GPUContextPool()

Method Detail

initializeGPU

public static void initializeGPU()

Static initialization of the number of devices Also sets behaviour for J{Cuda, Cudnn, Cublas, Cusparse} in case of error Initializes the CUDA driver All these need be done once, and not per GPU

parseListString

public static ArrayList<Integer> parseListString(String str,
                                                 int max)

Parses a string into a list. The string can be of these forms: 1. "-1" : all integers from range 0 to max - [0,1,2,3....max] 2. "2,3,0" : comma separated list of integers - [0,2,3] 3. "4" : a specific integer - [4] 4. "0-4" : a range of integers - [0,1,2,3,4] In ranges and comma separated lists, all values must be positive. Anything else is invalid.

Parameters:

str - input string

max - maximum range of integers

Returns:

the list of integers in the parsed string

reserveAllGPUContexts

public static List<GPUContext> reserveAllGPUContexts()

Reserves and gets an initialized list of GPUContexts

Returns:

null if no GPUContexts in pool, otherwise a valid list of GPUContext

getAvailableCount

public static int getAvailableCount()

Get the number of free GPUContexts

Returns:

number of free GPUContexts

getDeviceCount

public static int getDeviceCount()

Number of available devices on this machine

Returns:

number of available GPUs on this machine

freeAllGPUContexts

public static void freeAllGPUContexts()

Unreserves all GPUContexts

initialGPUMemBudget

public static long initialGPUMemBudget()
                                throws RuntimeException

Gets the initial GPU memory budget. This is the minimum of the available memories across all the GPUs on the machine(s)

Returns:

minimum available memory

Throws:

RuntimeException - if error initializing the GPUs