static int _get_ldom_sched_cpuset(hwloc_topology_t topology,
hwloc_obj_type_t hwtype, hwloc_obj_type_t req_hwtype,
uint32_t ldom, cpu_set_t *mask)
{
hwloc_obj_t obj;
hwloc_bitmap_t cpuset;
int hwdepth;
cpuset = hwloc_bitmap_alloc();
hwdepth = hwloc_get_type_depth(topology, hwtype);
obj = hwloc_get_obj_by_depth(topology, hwdepth, ldom);
_add_hwloc_cpuset(hwtype, req_hwtype, obj, 0, 0, cpuset);
hwloc_cpuset_to_glibc_sched_affinity(topology, cpuset,
mask, sizeof(cpu_set_t));
hwloc_bitmap_free(cpuset);
return true;
}
int main(void)
{
hwloc_topology_t topology;
#ifdef HWLOC_HAVE_CPU_SET
unsigned depth;
hwloc_bitmap_t hwlocset;
cpu_set_t schedset;
hwloc_obj_t obj;
int err;
#endif /* HWLOC_HAVE_CPU_SET */
hwloc_topology_init(&topology);
hwloc_topology_load(topology);
#ifdef HWLOC_HAVE_CPU_SET
depth = hwloc_topology_get_depth(topology);
hwlocset = hwloc_bitmap_dup(hwloc_topology_get_complete_cpuset(topology));
hwloc_cpuset_to_glibc_sched_affinity(topology, hwlocset, &schedset, sizeof(schedset));
#ifdef HWLOC_HAVE_OLD_SCHED_SETAFFINITY
err = sched_setaffinity(0, sizeof(schedset));
#else
err = sched_setaffinity(0, sizeof(schedset), &schedset);
#endif
assert(!err);
hwloc_bitmap_free(hwlocset);
#ifdef HWLOC_HAVE_OLD_SCHED_SETAFFINITY
err = sched_getaffinity(0, sizeof(schedset));
#else
err = sched_getaffinity(0, sizeof(schedset), &schedset);
#endif
assert(!err);
hwlocset = hwloc_bitmap_alloc();
hwloc_cpuset_from_glibc_sched_affinity(topology, hwlocset, &schedset, sizeof(schedset));
assert(hwloc_bitmap_isincluded(hwlocset, hwloc_topology_get_complete_cpuset(topology)));
hwloc_bitmap_andnot(hwlocset, hwlocset, hwloc_topology_get_online_cpuset(topology));
hwloc_bitmap_andnot(hwlocset, hwlocset, hwloc_topology_get_allowed_cpuset(topology));
assert(hwloc_bitmap_iszero(hwlocset));
hwloc_bitmap_free(hwlocset);
obj = hwloc_get_obj_by_depth(topology, depth-1, hwloc_get_nbobjs_by_depth(topology, depth-1) - 1);
assert(obj);
assert(obj->type == HWLOC_OBJ_PU);
hwlocset = hwloc_bitmap_dup(obj->cpuset);
hwloc_cpuset_to_glibc_sched_affinity(topology, hwlocset, &schedset, sizeof(schedset));
#ifdef HWLOC_HAVE_OLD_SCHED_SETAFFINITY
err = sched_setaffinity(0, sizeof(schedset));
#else
err = sched_setaffinity(0, sizeof(schedset), &schedset);
#endif
assert(!err);
hwloc_bitmap_free(hwlocset);
#ifdef HWLOC_HAVE_OLD_SCHED_SETAFFINITY
err = sched_getaffinity(0, sizeof(schedset));
#else
err = sched_getaffinity(0, sizeof(schedset), &schedset);
#endif
assert(!err);
hwlocset = hwloc_bitmap_alloc();
hwloc_cpuset_from_glibc_sched_affinity(topology, hwlocset, &schedset, sizeof(schedset));
assert(hwloc_bitmap_isequal(hwlocset, obj->cpuset));
hwloc_bitmap_free(hwlocset);
#endif /* HWLOC_HAVE_CPU_SET */
hwloc_topology_destroy(topology);
return 0;
}
/* user to have to play with the cgroup hierarchy to modify it */
extern int task_cgroup_cpuset_set_task_affinity(slurmd_job_t *job)
{
int fstatus = SLURM_ERROR;
#ifndef HAVE_HWLOC
error("task/cgroup: plugin not compiled with hwloc support, "
"skipping affinity.");
return fstatus;
#else
uint32_t i;
uint32_t nldoms;
uint32_t nsockets;
uint32_t ncores;
uint32_t npus;
uint32_t nobj;
uint32_t pfirst,plast;
uint32_t taskid = job->envtp->localid;
uint32_t jntasks = job->node_tasks;
uint32_t jnpus = jntasks * job->cpus_per_task;
pid_t pid = job->envtp->task_pid;
cpu_bind_type_t bind_type;
int verbose;
hwloc_topology_t topology;
#if HWLOC_API_VERSION <= 0x00010000
hwloc_cpuset_t cpuset,ct;
#else
hwloc_bitmap_t cpuset,ct;
#endif
hwloc_obj_t obj;
struct hwloc_obj *pobj;
hwloc_obj_type_t hwtype;
hwloc_obj_type_t req_hwtype;
int hwdepth;
size_t tssize;
cpu_set_t ts;
bind_type = job->cpu_bind_type ;
if (conf->task_plugin_param & CPU_BIND_VERBOSE ||
bind_type & CPU_BIND_VERBOSE)
verbose = 1 ;
if (bind_type & CPU_BIND_NONE) {
if (verbose)
info("task/cgroup: task[%u] is requesting no affinity",
taskid);
return 0;
} else if (bind_type & CPU_BIND_TO_THREADS) {
if (verbose)
info("task/cgroup: task[%u] is requesting "
"thread level binding",taskid);
req_hwtype = HWLOC_OBJ_PU;
} else if (bind_type & CPU_BIND_TO_CORES) {
if (verbose)
info("task/cgroup: task[%u] is requesting "
"core level binding",taskid);
req_hwtype = HWLOC_OBJ_CORE;
} else if (bind_type & CPU_BIND_TO_SOCKETS) {
if (verbose)
info("task/cgroup: task[%u] is requesting "
"socket level binding",taskid);
req_hwtype = HWLOC_OBJ_SOCKET;
} else if (bind_type & CPU_BIND_TO_LDOMS) {
if (verbose)
info("task/cgroup: task[%u] is requesting "
"ldom level binding",taskid);
req_hwtype = HWLOC_OBJ_NODE;
} else {
if (verbose)
info("task/cgroup: task[%u] using core level binding"
" by default",taskid);
req_hwtype = HWLOC_OBJ_CORE;
}
/* Allocate and initialize hwloc objects */
hwloc_topology_init(&topology);
#if HWLOC_API_VERSION <= 0x00010000
cpuset = hwloc_cpuset_alloc() ;
#else
cpuset = hwloc_bitmap_alloc() ;
#endif
/*
* Perform the topology detection. It will only get allowed PUs.
* Detect in the same time the granularity to use for binding.
* The granularity can be relaxed from threads to cores if enough
* cores are available as with hyperthread support, ntasks-per-core
* param can let us have access to more threads per core for each
* task
* Revert back to machine granularity if no finer-grained granularity
* matching the request is found. This will result in no affinity
* applied.
* The detected granularity will be used to find where to best place
* the task, then the cpu_bind option will be used to relax the
* affinity constraint and use more PUs. (i.e. use a core granularity
* to dispatch the tasks across the sockets and then provide access
* to each task to the cores of its socket.)
*/
hwloc_topology_load(topology);
npus = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_PU);
ncores = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_CORE);
nsockets = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_SOCKET);
nldoms = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_NODE);
hwtype = HWLOC_OBJ_MACHINE;
nobj = 1;
if (npus >= jnpus || bind_type & CPU_BIND_TO_THREADS) {
hwtype = HWLOC_OBJ_PU;
nobj = npus;
}
if (ncores >= jnpus || bind_type & CPU_BIND_TO_CORES) {
hwtype = HWLOC_OBJ_CORE;
nobj = ncores;
}
if (nsockets >= jntasks &&
bind_type & CPU_BIND_TO_SOCKETS) {
hwtype = HWLOC_OBJ_SOCKET;
nobj = nsockets;
}
/*
* HWLOC returns all the NUMA nodes available regardless of the
* number of underlying sockets available (regardless of the allowed
* resources). So there is no guarantee that each ldom will be populated
* with usable sockets. So add a simple check that at least ensure that
* we have as many sockets as ldoms before moving to ldoms granularity
*/
if (nldoms >= jntasks &&
nsockets >= nldoms &&
bind_type & CPU_BIND_TO_LDOMS) {
hwtype = HWLOC_OBJ_NODE;
nobj = nldoms;
}
/*
* Perform a block binding on the detected object respecting the
* granularity.
* If not enough objects to do the job, revert to no affinity mode
*/
if (hwloc_compare_types(hwtype,HWLOC_OBJ_MACHINE) == 0) {
info("task/cgroup: task[%u] disabling affinity because of %s "
"granularity",taskid,hwloc_obj_type_string(hwtype));
} else if (hwloc_compare_types(hwtype,HWLOC_OBJ_CORE) >= 0 &&
jnpus > nobj) {
info("task/cgroup: task[%u] not enough %s objects, disabling "
"affinity",taskid,hwloc_obj_type_string(hwtype));
} else {
if (verbose) {
info("task/cgroup: task[%u] using %s granularity",
taskid,hwloc_obj_type_string(hwtype));
}
if (hwloc_compare_types(hwtype,HWLOC_OBJ_CORE) >= 0) {
/* cores or threads granularity */
pfirst = taskid * job->cpus_per_task ;
plast = pfirst + job->cpus_per_task - 1;
} else {
/* sockets or ldoms granularity */
pfirst = taskid;
plast = pfirst;
}
hwdepth = hwloc_get_type_depth(topology,hwtype);
for (i = pfirst; i <= plast && i < nobj ; i++) {
obj = hwloc_get_obj_by_depth(topology,hwdepth,(int)i);
/* if requested binding overlap the granularity */
/* use the ancestor cpuset instead of the object one */
if (hwloc_compare_types(hwtype,req_hwtype) > 0) {
/* Get the parent object of req_hwtype or the */
/* one just above if not found (meaning of >0)*/
/* (useful for ldoms binding with !NUMA nodes)*/
pobj = obj->parent;
while (pobj != NULL &&
hwloc_compare_types(pobj->type,
req_hwtype) > 0)
pobj = pobj->parent;
if (pobj != NULL) {
if (verbose)
info("task/cgroup: task[%u] "
"higher level %s found",
taskid,
hwloc_obj_type_string(
pobj->type));
#if HWLOC_API_VERSION <= 0x00010000
ct = hwloc_cpuset_dup(pobj->
allowed_cpuset);
hwloc_cpuset_or(cpuset,cpuset,ct);
hwloc_cpuset_free(ct);
#else
ct = hwloc_bitmap_dup(pobj->
allowed_cpuset);
hwloc_bitmap_or(cpuset,cpuset,ct);
hwloc_bitmap_free(ct);
#endif
} else {
/* should not be executed */
if (verbose)
info("task/cgroup: task[%u] "
"no higher level found",
taskid);
#if HWLOC_API_VERSION <= 0x00010000
ct = hwloc_cpuset_dup(obj->
allowed_cpuset);
hwloc_cpuset_or(cpuset,cpuset,ct);
hwloc_cpuset_free(ct);
#else
ct = hwloc_bitmap_dup(obj->
allowed_cpuset);
hwloc_bitmap_or(cpuset,cpuset,ct);
hwloc_bitmap_free(ct);
#endif
}
} else {
#if HWLOC_API_VERSION <= 0x00010000
ct = hwloc_cpuset_dup(obj->allowed_cpuset);
hwloc_cpuset_or(cpuset,cpuset,ct);
hwloc_cpuset_free(ct);
#else
ct = hwloc_bitmap_dup(obj->allowed_cpuset);
hwloc_bitmap_or(cpuset,cpuset,ct);
hwloc_bitmap_free(ct);
#endif
}
}
char *str;
#if HWLOC_API_VERSION <= 0x00010000
hwloc_cpuset_asprintf(&str,cpuset);
#else
hwloc_bitmap_asprintf(&str,cpuset);
#endif
tssize = sizeof(cpu_set_t);
if (hwloc_cpuset_to_glibc_sched_affinity(topology,cpuset,
&ts,tssize) == 0) {
fstatus = SLURM_SUCCESS;
if (sched_setaffinity(pid,tssize,&ts)) {
error("task/cgroup: task[%u] unable to set "
"taskset '%s'",taskid,str);
fstatus = SLURM_ERROR;
} else if (verbose) {
info("task/cgroup: task[%u] taskset '%s' is set"
,taskid,str);
}
} else {
error("task/cgroup: task[%u] unable to build "
"taskset '%s'",taskid,str);
fstatus = SLURM_ERROR;
}
free(str);
}
/* Destroy hwloc objects */
#if HWLOC_API_VERSION <= 0x00010000
hwloc_cpuset_free(cpuset);
#else
hwloc_bitmap_free(cpuset);
#endif
hwloc_topology_destroy(topology);
return fstatus;
#endif
}
/* user to have to play with the cgroup hierarchy to modify it */
extern int task_cgroup_cpuset_set_task_affinity(slurmd_job_t *job)
{
int fstatus = SLURM_ERROR;
#ifndef HAVE_HWLOC
error("task/cgroup: plugin not compiled with hwloc support, "
"skipping affinity.");
return fstatus;
#else
hwloc_obj_type_t socket_or_node;
uint32_t nldoms;
uint32_t nsockets;
uint32_t ncores;
uint32_t npus;
uint32_t nobj;
uint32_t taskid = job->envtp->localid;
uint32_t jntasks = job->node_tasks;
uint32_t jnpus = jntasks * job->cpus_per_task;
pid_t pid = job->envtp->task_pid;
cpu_bind_type_t bind_type;
int bind_verbose = 0;
hwloc_topology_t topology;
hwloc_bitmap_t cpuset;
hwloc_obj_type_t hwtype;
hwloc_obj_type_t req_hwtype;
size_t tssize;
cpu_set_t ts;
bind_type = job->cpu_bind_type ;
if (conf->task_plugin_param & CPU_BIND_VERBOSE ||
bind_type & CPU_BIND_VERBOSE)
bind_verbose = 1 ;
/* Allocate and initialize hwloc objects */
hwloc_topology_init(&topology);
cpuset = hwloc_bitmap_alloc();
hwloc_topology_load(topology);
if ( hwloc_get_type_depth(topology, HWLOC_OBJ_NODE) >
hwloc_get_type_depth(topology, HWLOC_OBJ_SOCKET) ) {
/* One socket contains multiple NUMA-nodes
* like AMD Opteron 6000 series etc.
* In such case, use NUMA-node instead of socket. */
socket_or_node = HWLOC_OBJ_NODE;
} else {
socket_or_node = HWLOC_OBJ_SOCKET;
}
if (bind_type & CPU_BIND_NONE) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting no affinity",
taskid);
return 0;
} else if (bind_type & CPU_BIND_TO_THREADS) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"thread level binding",taskid);
req_hwtype = HWLOC_OBJ_PU;
} else if (bind_type & CPU_BIND_TO_CORES) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"core level binding",taskid);
req_hwtype = HWLOC_OBJ_CORE;
} else if (bind_type & CPU_BIND_TO_SOCKETS) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"socket level binding",taskid);
req_hwtype = socket_or_node;
} else if (bind_type & CPU_BIND_TO_LDOMS) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"ldom level binding",taskid);
req_hwtype = HWLOC_OBJ_NODE;
} else {
if (bind_verbose)
info("task/cgroup: task[%u] using core level binding"
" by default",taskid);
req_hwtype = HWLOC_OBJ_CORE;
}
/*
* Perform the topology detection. It will only get allowed PUs.
* Detect in the same time the granularity to use for binding.
* The granularity can be relaxed from threads to cores if enough
* cores are available as with hyperthread support, ntasks-per-core
* param can let us have access to more threads per core for each
* task
* Revert back to machine granularity if no finer-grained granularity
* matching the request is found. This will result in no affinity
* applied.
* The detected granularity will be used to find where to best place
* the task, then the cpu_bind option will be used to relax the
* affinity constraint and use more PUs. (i.e. use a core granularity
* to dispatch the tasks across the sockets and then provide access
* to each task to the cores of its socket.)
*/
npus = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_PU);
ncores = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_CORE);
nsockets = (uint32_t) hwloc_get_nbobjs_by_type(topology,
socket_or_node);
nldoms = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_NODE);
hwtype = HWLOC_OBJ_MACHINE;
nobj = 1;
if (npus >= jnpus || bind_type & CPU_BIND_TO_THREADS) {
hwtype = HWLOC_OBJ_PU;
nobj = npus;
}
if (ncores >= jnpus || bind_type & CPU_BIND_TO_CORES) {
hwtype = HWLOC_OBJ_CORE;
nobj = ncores;
}
if (nsockets >= jntasks &&
bind_type & CPU_BIND_TO_SOCKETS) {
hwtype = socket_or_node;
nobj = nsockets;
}
/*
* HWLOC returns all the NUMA nodes available regardless of the
* number of underlying sockets available (regardless of the allowed
* resources). So there is no guarantee that each ldom will be populated
* with usable sockets. So add a simple check that at least ensure that
* we have as many sockets as ldoms before moving to ldoms granularity
*/
if (nldoms >= jntasks &&
nsockets >= nldoms &&
bind_type & CPU_BIND_TO_LDOMS) {
hwtype = HWLOC_OBJ_NODE;
nobj = nldoms;
}
/*
* Bind the detected object to the taskid, respecting the
* granularity, using the designated or default distribution
* method (block or cyclic).
* If not enough objects to do the job, revert to no affinity mode
*/
if (hwloc_compare_types(hwtype,HWLOC_OBJ_MACHINE) == 0) {
info("task/cgroup: task[%u] disabling affinity because of %s "
"granularity",taskid,hwloc_obj_type_string(hwtype));
} else if (hwloc_compare_types(hwtype,HWLOC_OBJ_CORE) >= 0 &&
jnpus > nobj) {
info("task/cgroup: task[%u] not enough %s objects, disabling "
"affinity",taskid,hwloc_obj_type_string(hwtype));
} else {
char *str;
if (bind_verbose) {
info("task/cgroup: task[%u] using %s granularity",
taskid,hwloc_obj_type_string(hwtype));
}
/* There are two "distributions," controlled by the
* -m option of srun and friends. The first is the
* distribution of tasks to nodes. The second is the
* distribution of allocated cpus to tasks for
* binding. This code is handling the second
* distribution. Here's how the values get set, based
* on the value of -m
*
* SLURM_DIST_CYCLIC = srun -m cyclic
* SLURM_DIST_BLOCK = srun -m block
* SLURM_DIST_CYCLIC_CYCLIC = srun -m cyclic:cyclic
* SLURM_DIST_BLOCK_CYCLIC = srun -m block:cyclic
*
* In the first two cases, the user only specified the
* first distribution. The second distribution
* defaults to cyclic. In the second two cases, the
* user explicitly requested a second distribution of
* cyclic. So all these four cases correspond to a
* second distribution of cyclic. So we want to call
* _task_cgroup_cpuset_dist_cyclic.
*
* If the user explicitly specifies a second
* distribution of block, or if
* CR_CORE_DEFAULT_DIST_BLOCK is configured and the
* user does not explicitly specify a second
* distribution of cyclic, the second distribution is
* block, and we need to call
* _task_cgroup_cpuset_dist_block. In these cases,
* task_dist would be set to SLURM_DIST_CYCLIC_BLOCK
* or SLURM_DIST_BLOCK_BLOCK.
*
* You can see the equivalent code for the
* task/affinity plugin in
* src/plugins/task/affinity/dist_tasks.c, around line 384.
*/
switch (job->task_dist) {
case SLURM_DIST_CYCLIC:
case SLURM_DIST_BLOCK:
case SLURM_DIST_CYCLIC_CYCLIC:
case SLURM_DIST_BLOCK_CYCLIC:
_task_cgroup_cpuset_dist_cyclic(
topology, hwtype, req_hwtype,
job, bind_verbose, cpuset);
break;
default:
_task_cgroup_cpuset_dist_block(
topology, hwtype, req_hwtype,
nobj, job, bind_verbose, cpuset);
}
hwloc_bitmap_asprintf(&str, cpuset);
tssize = sizeof(cpu_set_t);
if (hwloc_cpuset_to_glibc_sched_affinity(topology,cpuset,
&ts,tssize) == 0) {
fstatus = SLURM_SUCCESS;
if (sched_setaffinity(pid,tssize,&ts)) {
error("task/cgroup: task[%u] unable to set "
"taskset '%s'",taskid,str);
fstatus = SLURM_ERROR;
} else if (bind_verbose) {
info("task/cgroup: task[%u] taskset '%s' is set"
,taskid,str);
}
} else {
error("task/cgroup: task[%u] unable to build "
"taskset '%s'",taskid,str);
fstatus = SLURM_ERROR;
}
free(str);
}
/* Destroy hwloc objects */
hwloc_bitmap_free(cpuset);
hwloc_topology_destroy(topology);
return fstatus;
#endif
}
/* user to have to play with the cgroup hierarchy to modify it */
extern int task_cgroup_cpuset_set_task_affinity(stepd_step_rec_t *job)
{
int fstatus = SLURM_ERROR;
#ifndef HAVE_HWLOC
error("task/cgroup: plugin not compiled with hwloc support, "
"skipping affinity.");
return fstatus;
#else
char mstr[1 + CPU_SETSIZE / 4];
cpu_bind_type_t bind_type;
cpu_set_t ts;
hwloc_obj_t obj;
hwloc_obj_type_t socket_or_node;
hwloc_topology_t topology;
hwloc_bitmap_t cpuset;
hwloc_obj_type_t hwtype;
hwloc_obj_type_t req_hwtype;
int bind_verbose = 0;
int rc = SLURM_SUCCESS, match;
pid_t pid = job->envtp->task_pid;
size_t tssize;
uint32_t nldoms;
uint32_t nsockets;
uint32_t ncores;
uint32_t npus;
uint32_t nobj;
uint32_t taskid = job->envtp->localid;
uint32_t jntasks = job->node_tasks;
uint32_t jnpus;
/* Allocate and initialize hwloc objects */
hwloc_topology_init(&topology);
hwloc_topology_load(topology);
cpuset = hwloc_bitmap_alloc();
int spec_threads = 0;
if (job->batch) {
jnpus = job->cpus;
job->cpus_per_task = job->cpus;
} else
jnpus = jntasks * job->cpus_per_task;
bind_type = job->cpu_bind_type;
if ((conf->task_plugin_param & CPU_BIND_VERBOSE) ||
(bind_type & CPU_BIND_VERBOSE))
bind_verbose = 1 ;
if ( hwloc_get_type_depth(topology, HWLOC_OBJ_NODE) >
hwloc_get_type_depth(topology, HWLOC_OBJ_SOCKET) ) {
/* One socket contains multiple NUMA-nodes
* like AMD Opteron 6000 series etc.
* In such case, use NUMA-node instead of socket. */
socket_or_node = HWLOC_OBJ_NODE;
} else {
socket_or_node = HWLOC_OBJ_SOCKET;
}
if (bind_type & CPU_BIND_NONE) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting no affinity",
taskid);
return 0;
} else if (bind_type & CPU_BIND_TO_THREADS) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"thread level binding",taskid);
req_hwtype = HWLOC_OBJ_PU;
} else if (bind_type & CPU_BIND_TO_CORES) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"core level binding",taskid);
req_hwtype = HWLOC_OBJ_CORE;
} else if (bind_type & CPU_BIND_TO_SOCKETS) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"socket level binding",taskid);
req_hwtype = socket_or_node;
} else if (bind_type & CPU_BIND_TO_LDOMS) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"ldom level binding",taskid);
req_hwtype = HWLOC_OBJ_NODE;
} else if (bind_type & CPU_BIND_TO_BOARDS) {
if (bind_verbose)
info("task/cgroup: task[%u] is requesting "
"board level binding",taskid);
req_hwtype = HWLOC_OBJ_GROUP;
} else if (bind_type & bind_mode_ldom) {
req_hwtype = HWLOC_OBJ_NODE;
} else {
if (bind_verbose)
info("task/cgroup: task[%u] using core level binding"
" by default",taskid);
req_hwtype = HWLOC_OBJ_CORE;
}
/*
* Perform the topology detection. It will only get allowed PUs.
* Detect in the same time the granularity to use for binding.
* The granularity can be relaxed from threads to cores if enough
* cores are available as with hyperthread support, ntasks-per-core
* param can let us have access to more threads per core for each
* task
* Revert back to machine granularity if no finer-grained granularity
* matching the request is found. This will result in no affinity
* applied.
* The detected granularity will be used to find where to best place
* the task, then the cpu_bind option will be used to relax the
* affinity constraint and use more PUs. (i.e. use a core granularity
* to dispatch the tasks across the sockets and then provide access
* to each task to the cores of its socket.)
*/
npus = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_PU);
ncores = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_CORE);
nsockets = (uint32_t) hwloc_get_nbobjs_by_type(topology,
socket_or_node);
nldoms = (uint32_t) hwloc_get_nbobjs_by_type(topology,
HWLOC_OBJ_NODE);
//info("PU:%d CORE:%d SOCK:%d LDOM:%d", npus, ncores, nsockets, nldoms);
hwtype = HWLOC_OBJ_MACHINE;
nobj = 1;
if ((job->job_core_spec != (uint16_t) NO_VAL) &&
(job->job_core_spec & CORE_SPEC_THREAD) &&
(job->job_core_spec != CORE_SPEC_THREAD)) {
spec_threads = job->job_core_spec & (~CORE_SPEC_THREAD);
}
if (npus >= (jnpus + spec_threads) || bind_type & CPU_BIND_TO_THREADS) {
hwtype = HWLOC_OBJ_PU;
nobj = npus;
}
if (ncores >= jnpus || bind_type & CPU_BIND_TO_CORES) {
hwtype = HWLOC_OBJ_CORE;
nobj = ncores;
}
if (nsockets >= jntasks &&
bind_type & CPU_BIND_TO_SOCKETS) {
hwtype = socket_or_node;
nobj = nsockets;
}
/*
* HWLOC returns all the NUMA nodes available regardless of the
* number of underlying sockets available (regardless of the allowed
* resources). So there is no guarantee that each ldom will be populated
* with usable sockets. So add a simple check that at least ensure that
* we have as many sockets as ldoms before moving to ldoms granularity
*/
if (nldoms >= jntasks &&
nsockets >= nldoms &&
bind_type & (CPU_BIND_TO_LDOMS | bind_mode_ldom)) {
hwtype = HWLOC_OBJ_NODE;
nobj = nldoms;
}
/*
* If not enough objects to do the job, revert to no affinity mode
*/
if (hwloc_compare_types(hwtype, HWLOC_OBJ_MACHINE) == 0) {
info("task/cgroup: task[%u] disabling affinity because of %s "
"granularity",taskid, hwloc_obj_type_string(hwtype));
} else if ((hwloc_compare_types(hwtype, HWLOC_OBJ_CORE) >= 0) &&
(nobj < jnpus)) {
info("task/cgroup: task[%u] not enough %s objects (%d < %d), "
"disabling affinity",
taskid, hwloc_obj_type_string(hwtype), nobj, jnpus);
} else if (bind_type & bind_mode) {
/* Explicit binding mode specified by the user
* Bind the taskid in accordance with the specified mode
*/
obj = hwloc_get_obj_by_type(topology, HWLOC_OBJ_MACHINE, 0);
match = hwloc_bitmap_isequal(obj->complete_cpuset,
obj->allowed_cpuset);
if ((job->job_core_spec == (uint16_t) NO_VAL) && !match) {
info("task/cgroup: entire node must be allocated, "
"disabling affinity, task[%u]", taskid);
fprintf(stderr, "Requested cpu_bind option requires "
"entire node to be allocated; disabling "
"affinity\n");
} else {
if (bind_verbose) {
info("task/cgroup: task[%u] is requesting "
"explicit binding mode", taskid);
}
_get_sched_cpuset(topology, hwtype, req_hwtype, &ts,
job);
tssize = sizeof(cpu_set_t);
fstatus = SLURM_SUCCESS;
if (job->job_core_spec != (uint16_t) NO_VAL)
_validate_mask(taskid, obj, &ts);
if ((rc = sched_setaffinity(pid, tssize, &ts))) {
error("task/cgroup: task[%u] unable to set "
"mask 0x%s", taskid,
cpuset_to_str(&ts, mstr));
error("sched_setaffinity rc = %d", rc);
fstatus = SLURM_ERROR;
} else if (bind_verbose) {
info("task/cgroup: task[%u] mask 0x%s",
taskid, cpuset_to_str(&ts, mstr));
}
_slurm_chkaffinity(&ts, job, rc);
}
} else {
/* Bind the detected object to the taskid, respecting the
* granularity, using the designated or default distribution
* method (block or cyclic). */
char *str;
if (bind_verbose) {
info("task/cgroup: task[%u] using %s granularity dist %u",
taskid, hwloc_obj_type_string(hwtype),
job->task_dist);
}
/* See srun man page for detailed information on --distribution
* option.
*
* You can see the equivalent code for the
* task/affinity plugin in
* src/plugins/task/affinity/dist_tasks.c, around line 368
*/
switch (job->task_dist & SLURM_DIST_NODESOCKMASK) {
case SLURM_DIST_BLOCK_BLOCK:
case SLURM_DIST_CYCLIC_BLOCK:
case SLURM_DIST_PLANE:
/* tasks are distributed in blocks within a plane */
_task_cgroup_cpuset_dist_block(topology,
hwtype, req_hwtype,
nobj, job, bind_verbose, cpuset);
break;
case SLURM_DIST_ARBITRARY:
case SLURM_DIST_BLOCK:
case SLURM_DIST_CYCLIC:
case SLURM_DIST_UNKNOWN:
if (slurm_get_select_type_param()
& CR_CORE_DEFAULT_DIST_BLOCK) {
_task_cgroup_cpuset_dist_block(topology,
hwtype, req_hwtype,
nobj, job, bind_verbose, cpuset);
break;
}
/* We want to fall through here if we aren't doing a
default dist block.
*/
default:
_task_cgroup_cpuset_dist_cyclic(topology,
hwtype, req_hwtype,
job, bind_verbose, cpuset);
break;
}
hwloc_bitmap_asprintf(&str, cpuset);
tssize = sizeof(cpu_set_t);
if (hwloc_cpuset_to_glibc_sched_affinity(topology, cpuset,
&ts, tssize) == 0) {
fstatus = SLURM_SUCCESS;
if ((rc = sched_setaffinity(pid, tssize, &ts))) {
error("task/cgroup: task[%u] unable to set "
"taskset '%s'", taskid, str);
fstatus = SLURM_ERROR;
} else if (bind_verbose) {
info("task/cgroup: task[%u] set taskset '%s'",
taskid, str);
}
_slurm_chkaffinity(&ts, job, rc);
} else {
error("task/cgroup: task[%u] unable to build "
"taskset '%s'",taskid,str);
fstatus = SLURM_ERROR;
}
free(str);
}
/* Destroy hwloc objects */
hwloc_bitmap_free(cpuset);
hwloc_topology_destroy(topology);
return fstatus;
#endif
}
