home *** CD-ROM | disk | FTP | other *** search
- DOCUMENT:Q110255 20-JAN-1994 [W_NT]
- TITLE :Performance Drops During Large File Copy
- PRODUCT :Windows NT
- PROD/VER:3.10
- OPER/SYS:WINDOWS
- KEYWORDS:
-
- --------------------------------------------------------------------------
- The information in this article applies to:
-
- - Microsoft Windows NT operating system version 3.1
- - Microsoft Windows NT Advanced Server version 3.1
- --------------------------------------------------------------------------
-
- SYMPTOMS
- ========
-
- System performance drops to an unacceptable level while a large file is
- being copied.
-
- CAUSE
- =====
-
- This problem may be a symptom of a problem with the way that the Server
- service interacts with the system cache in certain configurations.
-
- RESOLUTION
- ==========
-
- You may be able to work around this problem by tuning the server to balance
- memory use. To do this, do the following steps:
-
- 1. In the Control Panel window, choose the Network icon.
-
- 2. From the Installed Network Software box, select Server, and then choose
- the Configure button.
-
- 3. If either of the options "Maximize Throughput for File Sharing" or
- "Maximize Throughput for Network Applications" are currently selected,
- you may get better performance during large file copy operations by
- selecting the Balance option. If Balance or Minimize Memory Used is
- already selected, this article does not apply.
-
- 4. If you elected to make a change in Step 3, restart your computer so the
- change can take effect.
-
- MORE INFORMATION
- ================
-
- The two options that are designed to maximize network throughput each
- permit the system cache to use more available memory than it would
- otherwise. In this situation, the available memory can drop to levels that
- result in heavy swapping activity on the hard disks in order to accommodate
- requests from user or system applications that may subsequently need to be
- swapped into memory.
-
- The cache manager periodically gives up memory that it has allocated so
- that the system will never run completely out of memory due to caching
- alone. This can happen whenever a file copy operation is complete or when a
- threshold value is reached. This means that the problem described above
- does not occur if a series of smaller files are copied. The threshold value
- for the Balance option is enough higher than the threshold values for the
- options designed to maximize throughput that the problem does not occur
- there either.
-
- This problem is also more noticeable on computers with lower total physical
- memory. When more total physical memory is available, the minimum available
- memory threshold is also higher, which can alleviate the problem.
-
- STATUS
- ======
-
- Microsoft has confirmed this to be a problem in Windows NT and Windows NT
- Advanced Server version 3.1. We are researching this problem and will post
- new information here in the Microsoft Knowledge Base as it becomes
- available.
-
- Additional reference words: 3.10
- KBCategory:
- KBSubCategory: netsrv
-
-
- =============================================================================
-
- THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
- PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
- ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
- OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
- EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
- ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
- CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
- MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
- OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
- SO THE FOREGOING LIMITATION MAY NOT APPLY.
-
- Copyright Microsoft Corporation 1994.