Hardware Locality (hwloc) 2.9.2

distances.h
1/*
2 * Copyright © 2010-2023 Inria. All rights reserved.
3 * See COPYING in top-level directory.
4 */
5
10#ifndef HWLOC_DISTANCES_H
11#define HWLOC_DISTANCES_H
12
13#ifndef HWLOC_H
14#error Please include the main hwloc.h instead
15#endif
16
17
18#ifdef __cplusplus
19 extern "C" {
20#elif 0
21}
22#endif
23
24
53 struct hwloc_distances_s {
54 unsigned nbobjs;
55 hwloc_obj_t *objs;
60 unsigned long kind;
61 hwloc_uint64_t *values;
66};
67
79 enum hwloc_distances_kind_e {
83 HWLOC_DISTANCES_KIND_FROM_OS = (1UL<<0),
87 HWLOC_DISTANCES_KIND_FROM_USER = (1UL<<1),
88
95 HWLOC_DISTANCES_KIND_MEANS_LATENCY = (1UL<<2),
102 HWLOC_DISTANCES_KIND_MEANS_BANDWIDTH = (1UL<<3),
103
109 HWLOC_DISTANCES_KIND_HETEROGENEOUS_TYPES = (1UL<<4)
110};
111
137HWLOC_DECLSPEC int
138 hwloc_distances_get(hwloc_topology_t topology,
139 unsigned *nr, struct hwloc_distances_s **distances,
140 unsigned long kind, unsigned long flags);
141
148HWLOC_DECLSPEC int
149 hwloc_distances_get_by_depth(hwloc_topology_t topology, int depth,
150 unsigned *nr, struct hwloc_distances_s **distances,
151 unsigned long kind, unsigned long flags);
152
159HWLOC_DECLSPEC int
160 hwloc_distances_get_by_type(hwloc_topology_t topology, hwloc_obj_type_t type,
161 unsigned *nr, struct hwloc_distances_s **distances,
162 unsigned long kind, unsigned long flags);
163
174HWLOC_DECLSPEC int
175 hwloc_distances_get_by_name(hwloc_topology_t topology, const char *name,
176 unsigned *nr, struct hwloc_distances_s **distances,
177 unsigned long flags);
178
189HWLOC_DECLSPEC const char *
190 hwloc_distances_get_name(hwloc_topology_t topology, struct hwloc_distances_s *distances);
191
196HWLOC_DECLSPEC void
197 hwloc_distances_release(hwloc_topology_t topology, struct hwloc_distances_s *distances);
198
200 enum hwloc_distances_transform_e {
214 HWLOC_DISTANCES_TRANSFORM_REMOVE_NULL = 0,
215
228 HWLOC_DISTANCES_TRANSFORM_LINKS = 1,
229
237 HWLOC_DISTANCES_TRANSFORM_MERGE_SWITCH_PORTS = 2,
238
244 HWLOC_DISTANCES_TRANSFORM_TRANSITIVE_CLOSURE = 3
245};
246
275HWLOC_DECLSPEC int hwloc_distances_transform(hwloc_topology_t topology, struct hwloc_distances_s *distances,
276 enum hwloc_distances_transform_e transform,
277 void *transform_attr,
278 unsigned long flags);
279
293 static __hwloc_inline int
294 hwloc_distances_obj_index(struct hwloc_distances_s *distances, hwloc_obj_t obj)
295{
296 unsigned i;
297 for(i=0; i<distances->nbobjs; i++)
298 if (distances->objs[i] == obj)
299 return (int)i;
300 return -1;
301}
302
311 static __hwloc_inline int
312 hwloc_distances_obj_pair_values(struct hwloc_distances_s *distances,
313 hwloc_obj_t obj1, hwloc_obj_t obj2,
314 hwloc_uint64_t *value1to2, hwloc_uint64_t *value2to1)
315{
316 int i1 = hwloc_distances_obj_index(distances, obj1);
317 int i2 = hwloc_distances_obj_index(distances, obj2);
318 if (i1 < 0 || i2 < 0)
319 return -1;
320 *value1to2 = distances->values[i1 * distances->nbobjs + i2];
321 *value2to1 = distances->values[i2 * distances->nbobjs + i1];
322 return 0;
323}
324
348 typedef void * hwloc_distances_add_handle_t;
349
370HWLOC_DECLSPEC hwloc_distances_add_handle_t
371 hwloc_distances_add_create(hwloc_topology_t topology,
372 const char *name, unsigned long kind,
373 unsigned long flags);
374
397HWLOC_DECLSPEC int hwloc_distances_add_values(hwloc_topology_t topology,
398 hwloc_distances_add_handle_t handle,
399 unsigned nbobjs, hwloc_obj_t *objs,
400 hwloc_uint64_t *values,
401 unsigned long flags);
402
404 enum hwloc_distances_add_flag_e {
409 HWLOC_DISTANCES_ADD_FLAG_GROUP = (1UL<<0),
415 HWLOC_DISTANCES_ADD_FLAG_GROUP_INACCURATE = (1UL<<1)
416};
417
434HWLOC_DECLSPEC int hwloc_distances_add_commit(hwloc_topology_t topology,
435 hwloc_distances_add_handle_t handle,
436 unsigned long flags);
437
456HWLOC_DECLSPEC int hwloc_distances_remove(hwloc_topology_t topology);
457
464HWLOC_DECLSPEC int hwloc_distances_remove_by_depth(hwloc_topology_t topology, int depth);
465
472 static __hwloc_inline int
473 hwloc_distances_remove_by_type(hwloc_topology_t topology, hwloc_obj_type_t type)
474{
475 int depth = hwloc_get_type_depth(topology, type);
476 if (depth == HWLOC_TYPE_DEPTH_UNKNOWN || depth == HWLOC_TYPE_DEPTH_MULTIPLE)
477 return 0;
478 return hwloc_distances_remove_by_depth(topology, depth);
479}
480
487HWLOC_DECLSPEC int hwloc_distances_release_remove(hwloc_topology_t topology, struct hwloc_distances_s *distances);
488
492#ifdef __cplusplus
493} /* extern "C" */
494#endif
495
496
497#endif /* HWLOC_DISTANCES_H */
hwloc_obj_type_t
hwloc_obj_type_t
Type of topology object.
Definition: hwloc.h:197
hwloc_topology_t
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:716
hwloc_get_type_depth
int hwloc_get_type_depth(hwloc_topology_t topology, hwloc_obj_type_t type)
Returns the depth of objects of type type.
HWLOC_TYPE_DEPTH_UNKNOWN
@ HWLOC_TYPE_DEPTH_UNKNOWN
No object of given type exists in the topology.
Definition: hwloc.h:853
HWLOC_TYPE_DEPTH_MULTIPLE
@ HWLOC_TYPE_DEPTH_MULTIPLE
Objects of given type exist at different depth in the topology (only for Groups).
Definition: hwloc.h:854
hwloc_distances_release
void hwloc_distances_release(hwloc_topology_t topology, struct hwloc_distances_s *distances)
Release a distance matrix structure previously returned by hwloc_distances_get().
hwloc_distances_transform_e
hwloc_distances_transform_e
Transformations of distances structures.
Definition: distances.h:200
hwloc_distances_get_by_depth
int hwloc_distances_get_by_depth(hwloc_topology_t topology, int depth, unsigned *nr, struct hwloc_distances_s **distances, unsigned long kind, unsigned long flags)
Retrieve distance matrices for object at a specific depth in the topology.
hwloc_distances_get
int hwloc_distances_get(hwloc_topology_t topology, unsigned *nr, struct hwloc_distances_s **distances, unsigned long kind, unsigned long flags)
Retrieve distance matrices.
hwloc_distances_get_by_name
int hwloc_distances_get_by_name(hwloc_topology_t topology, const char *name, unsigned *nr, struct hwloc_distances_s **distances, unsigned long flags)
Retrieve a distance matrix with the given name.
hwloc_distances_get_by_type
int hwloc_distances_get_by_type(hwloc_topology_t topology, hwloc_obj_type_t type, unsigned *nr, struct hwloc_distances_s **distances, unsigned long kind, unsigned long flags)
Retrieve distance matrices for object of a specific type.
hwloc_distances_kind_e
hwloc_distances_kind_e
Kinds of distance matrices.
Definition: distances.h:79
hwloc_distances_transform
int hwloc_distances_transform(hwloc_topology_t topology, struct hwloc_distances_s *distances, enum hwloc_distances_transform_e transform, void *transform_attr, unsigned long flags)
Apply a transformation to a distances structure.
hwloc_distances_get_name
const char * hwloc_distances_get_name(hwloc_topology_t topology, struct hwloc_distances_s *distances)
Get a description of what a distances structure contains.
HWLOC_DISTANCES_TRANSFORM_TRANSITIVE_CLOSURE
@ HWLOC_DISTANCES_TRANSFORM_TRANSITIVE_CLOSURE
Apply a transitive closure to the matrix to connect objects across switches. This currently only appl...
Definition: distances.h:244
HWLOC_DISTANCES_TRANSFORM_MERGE_SWITCH_PORTS
@ HWLOC_DISTANCES_TRANSFORM_MERGE_SWITCH_PORTS
Merge switches with multiple ports into a single object. This currently only applies to NVSwitches wh...
Definition: distances.h:237
HWLOC_DISTANCES_TRANSFORM_LINKS
@ HWLOC_DISTANCES_TRANSFORM_LINKS
Replace bandwidth values with a number of links.
Definition: distances.h:228
HWLOC_DISTANCES_TRANSFORM_REMOVE_NULL
@ HWLOC_DISTANCES_TRANSFORM_REMOVE_NULL
Remove NULL objects from the distances structure.
Definition: distances.h:214
HWLOC_DISTANCES_KIND_FROM_USER
@ HWLOC_DISTANCES_KIND_FROM_USER
These distances were provided by the user.
Definition: distances.h:87
HWLOC_DISTANCES_KIND_MEANS_BANDWIDTH
@ HWLOC_DISTANCES_KIND_MEANS_BANDWIDTH
Distance values are similar to bandwidths between objects. Values are higher for closer objects,...
Definition: distances.h:102
HWLOC_DISTANCES_KIND_FROM_OS
@ HWLOC_DISTANCES_KIND_FROM_OS
These distances were obtained from the operating system or hardware.
Definition: distances.h:83
HWLOC_DISTANCES_KIND_HETEROGENEOUS_TYPES
@ HWLOC_DISTANCES_KIND_HETEROGENEOUS_TYPES
This distances structure covers objects of different types. This may apply to the "NVLinkBandwidth" s...
Definition: distances.h:109
HWLOC_DISTANCES_KIND_MEANS_LATENCY
@ HWLOC_DISTANCES_KIND_MEANS_LATENCY
Distance values are similar to latencies between objects. Values are smaller for closer objects,...
Definition: distances.h:95
hwloc_distances_obj_pair_values
static int hwloc_distances_obj_pair_values(struct hwloc_distances_s *distances, hwloc_obj_t obj1, hwloc_obj_t obj2, hwloc_uint64_t *value1to2, hwloc_uint64_t *value2to1)
Find the values between two objects in a distance matrices.
Definition: distances.h:312
hwloc_distances_obj_index
static int hwloc_distances_obj_index(struct hwloc_distances_s *distances, hwloc_obj_t obj)
Find the index of an object in a distances structure.
Definition: distances.h:294
hwloc_distances_add_commit
int hwloc_distances_add_commit(hwloc_topology_t topology, hwloc_distances_add_handle_t handle, unsigned long flags)
Commit a new distances structure.
hwloc_distances_add_flag_e
hwloc_distances_add_flag_e
Flags for adding a new distances to a topology.
Definition: distances.h:404
hwloc_distances_add_handle_t
void * hwloc_distances_add_handle_t
Handle to a new distances structure during its addition to the topology.
Definition: distances.h:348
hwloc_distances_add_create
hwloc_distances_add_handle_t hwloc_distances_add_create(hwloc_topology_t topology, const char *name, unsigned long kind, unsigned long flags)
Create a new empty distances structure.
hwloc_distances_add_values
int hwloc_distances_add_values(hwloc_topology_t topology, hwloc_distances_add_handle_t handle, unsigned nbobjs, hwloc_obj_t *objs, hwloc_uint64_t *values, unsigned long flags)
Specify the objects and values in a new empty distances structure.
HWLOC_DISTANCES_ADD_FLAG_GROUP_INACCURATE
@ HWLOC_DISTANCES_ADD_FLAG_GROUP_INACCURATE
If grouping, consider the distance values as inaccurate and relax the comparisons during the grouping...
Definition: distances.h:415
HWLOC_DISTANCES_ADD_FLAG_GROUP
@ HWLOC_DISTANCES_ADD_FLAG_GROUP
Try to group objects based on the newly provided distance information. This is ignored for distances ...
Definition: distances.h:409
hwloc_distances_release_remove
int hwloc_distances_release_remove(hwloc_topology_t topology, struct hwloc_distances_s *distances)
Release and remove the given distance matrice from the topology.
hwloc_distances_remove_by_type
static int hwloc_distances_remove_by_type(hwloc_topology_t topology, hwloc_obj_type_t type)
Remove distance matrices for objects of a specific type in the topology.
Definition: distances.h:473
hwloc_distances_remove_by_depth
int hwloc_distances_remove_by_depth(hwloc_topology_t topology, int depth)
Remove distance matrices for objects at a specific depth in the topology.
hwloc_distances_remove
int hwloc_distances_remove(hwloc_topology_t topology)
Remove all distance matrices from a topology.
hwloc_obj
Structure of a topology object.
Definition: hwloc.h:420
hwloc_distances_s
Matrix of distances between a set of objects.
Definition: distances.h:53
hwloc_distances_s::nbobjs
unsigned nbobjs
Number of objects described by the distance matrix.
Definition: distances.h:54
hwloc_distances_s::values
hwloc_uint64_t * values
Matrix of distances between objects, stored as a one-dimension array.
Definition: distances.h:61
hwloc_distances_s::kind
unsigned long kind
OR'ed set of hwloc_distances_kind_e.
Definition: distances.h:60
hwloc_distances_s::objs
hwloc_obj_t * objs
Array of objects described by the distance matrix. These objects are not in any particular order,...
Definition: distances.h:55