golang运行时：无法创建新的OS线程（已经有2049； errno = 12）

这是操作系统的限制。我假设您正在使用linux。

根据go的来源，它是调用

clone

ret := clone(cloneFlags, stk, unsafe.Pointer(mp), unsafe.Pointer(mp.g0), unsafe.Pointer(funcPC(mstart)))sigprocmask(_SIG_SETMASK, &oset, nil)if ret < 0 {    print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", -ret, ")n")    if ret == -_EAGAIN {        println("runtime: may need to increase max user processes (ulimit -u)")    }    throw("newosproc")}

从clone（2）的联机帮助页中，当时

errno=12

ENOMEM Cannot allocate sufficient memory to allocate a task structure   for the child, or to copy those parts of the caller's context   that need to be copied.