Repository navigation
Expand file tree
/
Copy pathdevice.py
More file actions
413 lines (343 loc) · 11.3 KB
/
Copy pathdevice.py
File metadata and controls
413 lines (343 loc) · 11.3 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
#######################################################
# 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 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 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