在 linux thread 下單個進程能創建的最大線程數在 glibc 編譯期就已經確定下來了，如果要加大進程能創建的線程數量，
需要重新編譯 glibc，改變相關的限制。:-)，一般需要修改linuxthreads/internals.h 中的 STACK_SIZE 和
linuxthreads/sysdeps/unix/sysv/linux/bits/local_lim.h 文件中的 PTHREAD_THREADS_MAX 的定義。
下面的 patch 是個修改的例子：
diff -urN glibc-2.2.x/linuxthreads/descr.h glibc-2.2.x.new/linuxthreads/descr.h
--- glibc-2.2.x/linuxthreads/descr.h Mon Feb 25 10:55:48 2002
+++ glibc-2.2.x.new/linuxthreads/descr.h Wed Aug 7 14:38:58 2002
@@ -201,7 +201,7 @@
THREAD_SELF implementation is used, this must be a power of two and
a multiple of PAGE_SIZE. */
#ifndef STACK_SIZE
-#define STACK_SIZE (2 * 1024 * 1024)
+#define STACK_SIZE (64 * PAGE_SIZE)
#endif
/* Get some notion of the current stack. Need not be exactly the top
diff -urN glibc-2.2.x/linuxthreads/sysdeps/unix/sysv/linux/bits/local_lim.h glibc-2.2.x.new/linuxthreads/sysdeps/unix/sysv/linux/bits/local_lim.h
--- glibc-2.2.x/linuxthreads/sysdeps/unix/sysv/linux/bits/local_lim.h Tue Apr
+++ glibc-2.2.x.new/linuxthreads/sysdeps/unix/sysv/linux/bits/local_lim.h
@@ -64,7 +64,7 @@
/* The number of threads per process. */
#define _POSIX_THREAD_THREADS_MAX 64
/* This is the value this implementation supports. */
-#define PTHREAD_THREADS_MAX 1024
+#define PTHREAD_THREADS_MAX 8192
/* Maximum amount by which a process can descrease its asynchronous I/O
priority level. */
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