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Bugfix：Avoid deadlock issues caused by logging in a loop #1265

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Bugfix：Avoid deadlock issues caused by logging in a loop #1265

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bfdb006
Avoid deadlock issues caused by logging in a loop.
wangfakang Apr 25, 2024
ad475ae
remove some duplicats logical thx @kiskra-nvidia.
wangfakang Apr 27, 2024
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26 changes: 15 additions & 11 deletions src/misc/param.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -65,17 +65,21 @@ void ncclLoadParam(char const* env, int64_t deftVal, int64_t uninitialized, int6
if (__atomic_load_n(cache, __ATOMIC_RELAXED) == uninitialized) {
const char* str = ncclGetEnv(env);
int64_t value = deftVal;
if (str && strlen(str) > 0) {
errno = 0;
value = strtoll(str, nullptr, 0);
if (errno) {
value = deftVal;
INFO(NCCL_ALL,"Invalid value %s for %s, using default %lld.", str, env, (long long)deftVal);
} else {
INFO(NCCL_ENV,"%s set by environment to %lld.", env, (long long)value);
}
if (!str || strlen(str) <= 0) {
__atomic_store_n(cache, value, __ATOMIC_RELAXED);
pthread_mutex_unlock(&mutex);
return;
}
errno = 0;
value = strtoll(str, nullptr, 0);
// To prevent deadlock issues caused by logging in a loop,
// so cache the value before the log operation.
__atomic_store_n(cache, errno ? deftVal : value, __ATOMIC_RELAXED);
if (errno) {
INFO(NCCL_ALL,"Invalid value %s for %s, using default %lld.", str, env, (long long)deftVal);
} else {
INFO(NCCL_ENV,"%s set by environment to %lld.", env, (long long)value);
}
__atomic_store_n(cache, value, __ATOMIC_RELAXED);
}
pthread_mutex_unlock(&mutex);
}
Expand All @@ -84,4 +88,4 @@ const char *ncclGetEnv(const char *name) {
static pthread_once_t once = PTHREAD_ONCE_INIT;
pthread_once(&once, initEnv);
return getenv(name);
}
}