桌面堆概述(二）
我想提供一些关于桌面堆的后续信息。在第一篇文章中，我没有讨论64位Windows、3GB或Vista上与桌面堆相关的内存范围的大小。所以，不用再多说了，下面是各种平台上的相关大小。
Windows XP (32-bit)
· 48 MB = SessionViewSize (default registry value, set for XP Professional, x86)
· 20 MB = SessionViewSize (if no registry value is defined)
· 3072 KB = Interactive desktop heap size (defined in the registry, SharedSection 2nd value)
· 512 KB = Non-interactive desktop heap size (defined in the registry, SharedSection 3nd value)
· 128 KB = Winlogon desktop heap size
· 64 KB = Disconnect desktop heap size
Windows Server 2003 (32-bit)
· 48 MB = SessionViewSize (default registry value)
· 20 MB = SessionViewSize (if no registry value is defined; this is the default for Terminal Servers)
· 3072 KB = Interactive desktop heap size (defined in the registry, SharedSection 2nd value)
· 512 KB = Non-interactive desktop heap size (defined in the registry, SharedSection 3nd value)
· 128 KB = Winlogon desktop heap size
· 64 KB = Disconnect desktop heap size
Windows Server 2003 booted with 3GB (32-bit)
· 20 MB = SessionViewSize (registry value has no effect)
· 3072 KB = Interactive desktop heap size (defined in the registry, SharedSection 2nd value)
· 512 KB = Non-interactive desktop heap size (defined in the registry, SharedSection 3nd value)
· 128 KB = Winlogon desktop heap size
· 64 KB = Disconnect desktop heap size
在运行3GB时，您还可能看到堆大小减小。在初始化窗口管理器期间，尝试保留足够的会话视图空间，以容纳给定会话的预期桌面堆数。如果在SharedSection注册表值中指定的堆大小已增大，则保留会话视图空间的尝试可能会失败。当这种情况发生时，窗口管理器会回到桌面堆的一对“安全”大小（交互式为512KB，非交互式为128KB），并再次尝试保留会话空间，使用这些较小的数字。这可以确保即使注册表值对于20MB会话视图空间来说太大，系统仍然能够引导。
Windows Server 2003 (64-bit)
· 104 MB = SessionViewSize (if no registry value is defined; which is the default)
· 20 MB = Interactive desktop heap size (defined in the registry, SharedSection 2nd value)
· 768 KB = Non-interactive desktop heap size (defined in the registry, SharedSection 3nd value)
· 192 KB = Winlogon desktop heap size
· 96 KB = Disconnect desktop heap size
Windows Vista RTM (32-bit)
· Session View space is now a dynamic kernel address range. The SessionViewSize registry value is no longer used.
· 3072 KB = Interactive desktop heap size (defined in the registry, SharedSection 2nd value)
· 512 KB = Non-interactive desktop heap size (defined in the registry, SharedSection 3nd value)
· 128 KB = Winlogon desktop heap size
· 64 KB = Disconnect desktop heap size
Windows Vista (64-bit) and Windows Server 2008 (64-bit)
· Session View space is now a dynamic kernel address range. The SessionViewSize registry value is no longer used.
· 20 MB = Interactive desktop heap size (defined in the registry, SharedSection 2nd value)
· 768 KB = Non-interactive desktop heap size (defined in the registry, SharedSection 3nd value)
· 192 KB = Winlogon desktop heap size
· 96 KB = Disconnect desktop heap size
Windows Vista SP1 (32-bit) and Windows Server 2008 (32-bit)
· Session View space is now a dynamic kernel address range. The SessionViewSize registry value is no longer used.
· 12288 KB = Interactive desktop heap size (defined in the registry, SharedSection 2nd value)
· 512 KB = Non-interactive desktop heap size (defined in the registry, SharedSection 3nd value)
· 128 KB = Winlogon desktop heap size
· 64 KB = Disconnect desktop heap size
windowsvista引入了一个新的公共API函数：CreateDesktopEx，它允许调用者指定桌面堆的大小。
此外，GetUserObjectInformation现在包含一个新的标志，用于检索桌面堆大小（UOI_HEAPSIZE）。