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-rw-r--r--erts/doc/src/erl.xml27
-rw-r--r--erts/emulator/beam/erl_cpu_topology.c36
-rw-r--r--erts/emulator/beam/erl_cpu_topology.h2
-rw-r--r--erts/emulator/beam/erl_init.c14
-rw-r--r--erts/etc/common/erlexec.c1
5 files changed, 62 insertions, 18 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index 99f2466d79..5352fad143 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -710,7 +710,24 @@
<taglist>
<tag><marker id="+sbt"><c>+sbt BindType</c></marker></tag>
<item>
- <p>Set scheduler bind type. Currently valid <c>BindType</c>s:
+ <p>Set scheduler bind type.</p>
+ <p>Schedulers can also be bound using the
+ <seealso marker="#+stbt">+stbt</seealso> flag. The only difference
+ between these two flags is how the following errors are handled:</p>
+ <list>
+ <item>Binding of schedulers is not supported on the specific
+ platform.</item>
+ <item>No available CPU topology. That is the runtime system
+ was not able to automatically detected the CPU topology, and
+ no <seealso marker="#+sct">user defined CPU topology</seealso>
+ was set.</item>
+ </list>
+ <p>If any of these errors occur when <c>+sbt</c> has been passed,
+ the runtime system will print an error message, and refuse to
+ start. If any of these errors occur when <c>+stbt</c> has been
+ passed, the runtime system will silently ignore the error, and
+ start up using unbound schedulers.</p>
+ <p>Currently valid <c>BindType</c>s:
</p>
<taglist>
<tag><c>u</c></tag>
@@ -960,6 +977,14 @@
<p>For more information, see
<seealso marker="erlang#system_info_cpu_topology">erlang:system_info(cpu_topology)</seealso>.</p>
</item>
+ <tag><marker id="+stbt"><c>+stbt BindType</c></marker></tag>
+ <item>
+ <p>Try to set scheduler bind type. The same as the
+ <seealso marker="#+sbt">+sbt</seealso> flag with the exception of
+ how some errors are handled. For more information, see the
+ documentation of the <seealso marker="#+sbt">+sbt</seealso> flag.
+ </p>
+ </item>
<tag><marker id="+sws"><c>+sws default|legacy|proposal</c></marker></tag>
<item>
<p>Set scheduler wakeup strategy. Default is <c>legacy</c> (has been
diff --git a/erts/emulator/beam/erl_cpu_topology.c b/erts/emulator/beam/erl_cpu_topology.c
index 3f90f34736..93ef09a677 100644
--- a/erts/emulator/beam/erl_cpu_topology.c
+++ b/erts/emulator/beam/erl_cpu_topology.c
@@ -620,30 +620,38 @@ write_schedulers_bind_change(erts_cpu_topology_t *cpudata, int size)
int
erts_init_scheduler_bind_type_string(char *how)
{
+ ErtsCpuBindOrder order;
+
if (sys_strcmp(how, "u") == 0)
- cpu_bind_order = ERTS_CPU_BIND_NONE;
- else if (erts_bind_to_cpu(cpuinfo, -1) == -ENOTSUP)
- return ERTS_INIT_SCHED_BIND_TYPE_NOT_SUPPORTED;
- else if (!system_cpudata && !user_cpudata)
- return ERTS_INIT_SCHED_BIND_TYPE_ERROR_NO_CPU_TOPOLOGY;
+ order = ERTS_CPU_BIND_NONE;
else if (sys_strcmp(how, "db") == 0)
- cpu_bind_order = ERTS_CPU_BIND_DEFAULT_BIND;
+ order = ERTS_CPU_BIND_DEFAULT_BIND;
else if (sys_strcmp(how, "s") == 0)
- cpu_bind_order = ERTS_CPU_BIND_SPREAD;
+ order = ERTS_CPU_BIND_SPREAD;
else if (sys_strcmp(how, "ps") == 0)
- cpu_bind_order = ERTS_CPU_BIND_PROCESSOR_SPREAD;
+ order = ERTS_CPU_BIND_PROCESSOR_SPREAD;
else if (sys_strcmp(how, "ts") == 0)
- cpu_bind_order = ERTS_CPU_BIND_THREAD_SPREAD;
+ order = ERTS_CPU_BIND_THREAD_SPREAD;
else if (sys_strcmp(how, "tnnps") == 0)
- cpu_bind_order = ERTS_CPU_BIND_THREAD_NO_NODE_PROCESSOR_SPREAD;
+ order = ERTS_CPU_BIND_THREAD_NO_NODE_PROCESSOR_SPREAD;
else if (sys_strcmp(how, "nnps") == 0)
- cpu_bind_order = ERTS_CPU_BIND_NO_NODE_PROCESSOR_SPREAD;
+ order = ERTS_CPU_BIND_NO_NODE_PROCESSOR_SPREAD;
else if (sys_strcmp(how, "nnts") == 0)
- cpu_bind_order = ERTS_CPU_BIND_NO_NODE_THREAD_SPREAD;
+ order = ERTS_CPU_BIND_NO_NODE_THREAD_SPREAD;
else if (sys_strcmp(how, "ns") == 0)
- cpu_bind_order = ERTS_CPU_BIND_NO_SPREAD;
+ order = ERTS_CPU_BIND_NO_SPREAD;
else
- return ERTS_INIT_SCHED_BIND_TYPE_ERROR_NO_BAD_TYPE;
+ return ERTS_INIT_SCHED_BIND_TYPE_ERROR_BAD_TYPE;
+
+ if (order != ERTS_CPU_BIND_NONE) {
+ if (erts_bind_to_cpu(cpuinfo, -1) == -ENOTSUP)
+ return ERTS_INIT_SCHED_BIND_TYPE_NOT_SUPPORTED;
+ else if (!system_cpudata && !user_cpudata)
+ return ERTS_INIT_SCHED_BIND_TYPE_ERROR_NO_CPU_TOPOLOGY;
+ }
+
+ cpu_bind_order = order;
+
return ERTS_INIT_SCHED_BIND_TYPE_SUCCESS;
}
diff --git a/erts/emulator/beam/erl_cpu_topology.h b/erts/emulator/beam/erl_cpu_topology.h
index c5a9520b61..11915e1ea8 100644
--- a/erts/emulator/beam/erl_cpu_topology.h
+++ b/erts/emulator/beam/erl_cpu_topology.h
@@ -40,7 +40,7 @@ void erts_init_cpu_topology(void);
#define ERTS_INIT_SCHED_BIND_TYPE_SUCCESS 0
#define ERTS_INIT_SCHED_BIND_TYPE_NOT_SUPPORTED 1
#define ERTS_INIT_SCHED_BIND_TYPE_ERROR_NO_CPU_TOPOLOGY 2
-#define ERTS_INIT_SCHED_BIND_TYPE_ERROR_NO_BAD_TYPE 3
+#define ERTS_INIT_SCHED_BIND_TYPE_ERROR_BAD_TYPE 3
int erts_init_scheduler_bind_type_string(char *how);
diff --git a/erts/emulator/beam/erl_init.c b/erts/emulator/beam/erl_init.c
index 8cdf954dd2..01b2b64b50 100644
--- a/erts/emulator/beam/erl_init.c
+++ b/erts/emulator/beam/erl_init.c
@@ -521,7 +521,7 @@ void erts_usage(void)
erts_fprintf(stderr, "-r force ets memory block to be moved on realloc\n");
erts_fprintf(stderr, "-rg amount set reader groups limit\n");
erts_fprintf(stderr, "-sbt type set scheduler bind type, valid types are:\n");
- erts_fprintf(stderr, " u|ns|ts|ps|s|nnts|nnps|tnnps|db\n");
+ erts_fprintf(stderr, "-stbt type u|ns|ts|ps|s|nnts|nnps|tnnps|db\n");
erts_fprintf(stderr, "-sbwt val set scheduler busy wait threshold, valid values are:\n");
erts_fprintf(stderr, " none|very_short|short|medium|long|very_long.\n");
erts_fprintf(stderr, "-scl bool enable/disable compaction of scheduler load,\n");
@@ -1238,7 +1238,7 @@ erl_start(int argc, char **argv)
case ERTS_INIT_SCHED_BIND_TYPE_ERROR_NO_CPU_TOPOLOGY:
estr = "no cpu topology available";
break;
- case ERTS_INIT_SCHED_BIND_TYPE_ERROR_NO_BAD_TYPE:
+ case ERTS_INIT_SCHED_BIND_TYPE_ERROR_BAD_TYPE:
estr = "invalid type";
break;
default:
@@ -1333,6 +1333,16 @@ erl_start(int argc, char **argv)
}
else if (sys_strcmp("nsp", sub_param) == 0)
erts_use_sender_punish = 0;
+ else if (has_prefix("tbt", sub_param)) {
+ arg = get_arg(sub_param+3, argv[i+1], &i);
+ res = erts_init_scheduler_bind_type_string(arg);
+ if (res == ERTS_INIT_SCHED_BIND_TYPE_ERROR_BAD_TYPE) {
+ erts_fprintf(stderr,
+ "setting scheduler bind type '%s' failed: invalid type\n",
+ arg);
+ erts_usage();
+ }
+ }
else if (sys_strcmp("wt", sub_param) == 0) {
arg = get_arg(sub_param+2, argv[i+1], &i);
if (erts_sched_set_wakeup_other_thresold(arg) != 0) {
diff --git a/erts/etc/common/erlexec.c b/erts/etc/common/erlexec.c
index 50c61f50eb..d865164bb0 100644
--- a/erts/etc/common/erlexec.c
+++ b/erts/etc/common/erlexec.c
@@ -124,6 +124,7 @@ static char *pluss_val_switches[] = {
"bwt",
"cl",
"ct",
+ "tbt",
"wt",
"ws",
"ss",
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 19:26:08 +0000