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GeezerVison is showing github.com — arrayfire-python/arrayfire/device.py at master · arrayfire/arrayfire-python Expand file tree/ Copy pathdevice.pyMore file actions 478 lines (401 loc) · 13.7 KB / Copy pathdevice.pyFile metadata and controls478 lines (401 loc) · 13.7 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 ####################################################### # Copyright (c) 2015, ArrayFire # All rights reserved. # # This file is distributed under 3-clause BSD license. # The complete license agreement can be obtained at: # http://arrayfire.com/licenses/BSD-3-Clause ######################################################## """ Functions to handle the available devices in the backend. """ from .library import * from .util import (safe_call, to_str, get_version) def init(): """ Note ----- This function may need to be called when interoperating with other libraries """ safe_call(backend.get().af_init()) def info(): """ Displays the information about the following: - ArrayFire build and version number. - The number of devices available. - The names of the devices. - The current device being used. """ safe_call(backend.get().af_info()) def device_info(): """ Returns a map with the following fields: - 'device': Name of the current device. - 'backend': The current backend being used. - 'toolkit': The toolkit version for the backend. - 'compute': The compute version of the device. """ c_char_256 = c_char_t * 256 device_name = c_char_256() backend_name = c_char_256() toolkit = c_char_256() compute = c_char_256() safe_call(backend.get().af_device_info(c_pointer(device_name), c_pointer(backend_name), c_pointer(toolkit), c_pointer(compute))) dev_info = {} dev_info['device'] = to_str(device_name) dev_info['backend'] = to_str(backend_name) dev_info['toolkit'] = to_str(toolkit) dev_info['compute'] = to_str(compute) return dev_info def get_device_count(): """ Returns the number of devices available. """ c_num = c_int_t(0) safe_call(backend.get().af_get_device_count(c_pointer(c_num))) return c_num.value def get_device(): """ Returns the id of the current device. """ c_dev = c_int_t(0) safe_call(backend.get().af_get_device(c_pointer(c_dev))) return c_dev.value def set_device(num): """ Change the active device to the specified id. Parameters ----------- num: int. id of the desired device. """ safe_call(backend.get().af_set_device(num)) def info_str(verbose = False): """ Returns information about the following as a string: - ArrayFire version number. - The number of devices available. - The names of the devices. - The current device being used. """ import platform res_str = 'ArrayFire' major, minor, patch = get_version() dev_info = device_info() backend_str = dev_info['backend'] res_str += ' v' + str(major) + '.' + str(minor) + '.' + str(patch) res_str += ' (' + backend_str + ' ' + platform.architecture()[0] + ')\n' num_devices = get_device_count() curr_device_id = get_device() for n in range(num_devices): # To suppress warnings on CPU if (n != curr_device_id): set_device(n) if (n == curr_device_id): res_str += '[%d] ' % n else: res_str += '-%d- ' % n dev_info = device_info() if (backend_str.lower() == 'opencl'): res_str += dev_info['toolkit'] res_str += ': ' + dev_info['device'] if (backend_str.lower() != 'cpu'): res_str += ' (Compute ' + dev_info['compute'] + ')' res_str += '\n' # To suppress warnings on CPU if (curr_device_id != get_device()): set_device(curr_device_id) return res_str def is_dbl_supported(device=None): """ Check if double precision is supported on specified device. Parameters ----------- device: optional: int. default: None. id of the desired device. Returns -------- - True if double precision supported. - False if double precision not supported. """ dev = device if device is not None else get_device() res = c_bool_t(False) safe_call(backend.get().af_get_dbl_support(c_pointer(res), dev)) return res.value def is_half_supported(device=None): """ Check if half precision is supported on specified device. Parameters ----------- device: optional: int. default: None. id of the desired device. Returns -------- - True if half precision supported. - False if half precision not supported. """ dev = device if device is not None else get_device() res = c_bool_t(False) safe_call(backend.get().af_get_half_support(c_pointer(res), dev)) return res.value def sync(device=None): """ Block until all the functions on the device have completed execution. Parameters ----------- device: optional: int. default: None. id of the desired device. """ dev = device if device is not None else get_device() safe_call(backend.get().af_sync(dev)) def __eval(*args): nargs = len(args) if (nargs == 1): safe_call(backend.get().af_eval(args[0].arr)) else: c_void_p_n = c_void_ptr_t * nargs arrs = c_void_p_n() for n in range(nargs): arrs[n] = args[n].arr safe_call(backend.get().af_eval_multiple(c_int_t(nargs), c_pointer(arrs))) return def eval(*args): """ Evaluate one or more inputs together Parameters ----------- args : arguments to be evaluated Note ----- All the input arrays to this function should be of the same size. Examples -------- >>> a = af.constant(1, 3, 3) >>> b = af.constant(2, 3, 3) >>> c = a + b >>> d = a - b >>> af.eval(c, d) # A single kernel is launched here >>> c arrayfire.Array() Type: float [3 3 1 1] 3.0000 3.0000 3.0000 3.0000 3.0000 3.0000 3.0000 3.0000 3.0000 >>> d arrayfire.Array() Type: float [3 3 1 1] -1.0000 -1.0000 -1.0000 -1.0000 -1.0000 -1.0000 -1.0000 -1.0000 -1.0000 """ for arg in args: if not isinstance(arg, Array): raise RuntimeError("All inputs to eval must be of type arrayfire.Array") __eval(*args) def set_manual_eval_flag(flag): """ Tells the backend JIT engine to disable heuristics for determining when to evaluate a JIT tree. Parameters ---------- flag : optional: bool. - Specifies if the heuristic evaluation of the JIT tree needs to be disabled. Note ---- This does not affect the evaluation that occurs when a non JIT function forces the evaluation. """ safe_call(backend.get().af_set_manual_eval_flag(flag)) def get_manual_eval_flag(): """ Query the backend JIT engine to see if the user disabled heuristic evaluation of the JIT tree. Note ---- This does not affect the evaluation that occurs when a non JIT function forces the evaluation. """ res = c_bool_t(False) safe_call(backend.get().af_get_manual_eval_flag(c_pointer(res))) return res.value def device_mem_info(): """ Returns a map with the following fields: - 'alloc': Contains the map of the following - 'buffers' : Total number of buffers allocated by memory manager. - 'bytes' : Total number of bytes allocated by memory manager. - 'lock': Contains the map of the following - 'buffers' : Total number of buffers currently in scope. - 'bytes' : Total number of bytes currently in scope. Note ----- ArrayFire does not free memory when array goes out of scope. The memory is marked for reuse. - The difference between alloc buffers and lock buffers equals the number of free buffers. - The difference between alloc bytes and lock bytes equals the number of free bytes. """ alloc_bytes = c_size_t(0) alloc_buffers = c_size_t(0) lock_bytes = c_size_t(0) lock_buffers = c_size_t(0) safe_call(backend.get().af_device_mem_info(c_pointer(alloc_bytes), c_pointer(alloc_buffers), c_pointer(lock_bytes), c_pointer(lock_buffers))) mem_info = {} mem_info['alloc'] = {'buffers' : alloc_buffers.value, 'bytes' : alloc_bytes.value} mem_info['lock'] = {'buffers' : lock_buffers.value, 'bytes' : lock_bytes.value} return mem_info def print_mem_info(title = "Memory Info", device_id = None): """ Prints the memory used for the specified device. Parameters ---------- title: optional. Default: "Memory Info" - Title to display before printing the memory info. device_id: optional. Default: None - Specifies the device for which the memory info should be displayed. - If None, uses the current device. Examples -------- >>> a = af.randu(5,5) >>> af.print_mem_info() Memory Info --------------------------------------------------------- | POINTER | SIZE | AF LOCK | USER LOCK | --------------------------------------------------------- | 0x706400000 | 1 KB | Yes | No | --------------------------------------------------------- >>> b = af.randu(5,5) >>> af.print_mem_info() Memory Info --------------------------------------------------------- | POINTER | SIZE | AF LOCK | USER LOCK | --------------------------------------------------------- | 0x706400400 | 1 KB | Yes | No | | 0x706400000 | 1 KB | Yes | No | --------------------------------------------------------- >>> a = af.randu(1000,1000) >>> af.print_mem_info() Memory Info --------------------------------------------------------- | POINTER | SIZE | AF LOCK | USER LOCK | --------------------------------------------------------- | 0x706500000 | 3.815 MB | Yes | No | | 0x706400400 | 1 KB | Yes | No | | 0x706400000 | 1 KB | No | No | --------------------------------------------------------- """ device_id = device_id if device_id else get_device() safe_call(backend.get().af_print_mem_info(title.encode('utf-8'), device_id)) def device_gc(): """ Ask the garbage collector to free all unlocked memory """ safe_call(backend.get().af_device_gc()) def get_device_ptr(a): """ Get the raw device pointer of an array Parameters ---------- a: af.Array - A multi dimensional arrayfire array. Returns ------- - internal device pointer held by a Note ----- - The device pointer of `a` is not freed by memory manager until `unlock_device_ptr()` is called. - This function enables the user to interoperate arrayfire with other CUDA/OpenCL/C libraries. """ ptr = c_void_ptr_t(0) safe_call(backend.get().af_get_device_ptr(c_pointer(ptr), a.arr)) return ptr def lock_device_ptr(a): """ This functions is deprecated. Please use lock_array instead. """ import warnings warnings.warn("This function is deprecated. Use lock_array instead.", DeprecationWarning) lock_array(a) def lock_array(a): """ Ask arrayfire to not perform garbage collection on raw data held by an array. Parameters ---------- a: af.Array - A multi dimensional arrayfire array. Note ----- - The device pointer of `a` is not freed by memory manager until `unlock_array()` is called. """ safe_call(backend.get().af_lock_array(a.arr)) def is_locked_array(a): """ Check if the input array is locked by the user. Parameters ---------- a: af.Array - A multi dimensional arrayfire array. Returns ----------- A bool specifying if the input array is locked. """ res = c_bool_t(False) safe_call(backend.get().af_is_locked_array(c_pointer(res), a.arr)) return res.value def unlock_device_ptr(a): """ This functions is deprecated. Please use unlock_array instead. """ import warnings warnings.warn("This function is deprecated. Use unlock_array instead.", DeprecationWarning) unlock_array(a) def unlock_array(a): """ Tell arrayfire to resume garbage collection on raw data held by an array. Parameters ---------- a: af.Array - A multi dimensional arrayfire array. """ safe_call(backend.get().af_unlock_array(a.arr)) def alloc_device(num_bytes): """ Allocate a buffer on the device with specified number of bytes. """ ptr = c_void_ptr_t(0) c_num_bytes = c_dim_t(num_bytes) safe_call(backend.get().af_alloc_device(c_pointer(ptr), c_num_bytes)) return ptr.value def alloc_host(num_bytes): """ Allocate a buffer on the host with specified number of bytes. """ ptr = c_void_ptr_t(0) c_num_bytes = c_dim_t(num_bytes) safe_call(backend.get().af_alloc_host(c_pointer(ptr), c_num_bytes)) return ptr.value def alloc_pinned(num_bytes): """ Allocate a buffer on the host using pinned memory with specified number of bytes. """ ptr = c_void_ptr_t(0) c_num_bytes = c_dim_t(num_bytes) safe_call(backend.get().af_alloc_pinned(c_pointer(ptr), c_num_bytes)) return ptr.value def free_device(ptr): """ Free the device memory allocated by alloc_device """ cptr = c_void_ptr_t(ptr) safe_call(backend.get().af_free_device(cptr)) def free_host(ptr): """ Free the host memory allocated by alloc_host """ cptr = c_void_ptr_t(ptr) safe_call(backend.get().af_free_host(cptr)) def free_pinned(ptr): """ Free the pinned memory allocated by alloc_pinned """ cptr = c_void_ptr_t(ptr) safe_call(backend.get().af_free_pinned(cptr)) from .array import Array |
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