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The SmartScan GenCRCDiff.exe is incurring high CPU utilization

    • Updated:
    • 22 Apr 2013
    • Product/Version:
    • OfficeScan 10.0
    • Platform:
    • Windows 2000 Advanced Server
    • Windows 2003 Enterprise Server
    • Windows 2008 Enterprise Server
Summary
The SmartScan GenCRCDiff is a high CPU and Disk I/O consuming action that is why we recommend using Core 2 Duo processor for SmartScan Mode. You can refer to page 42 of this document for the system requirements.
SmartScan has a throttling mechanism for CPU usage for GenCRCDiff, but it only works for non-hyper thread (low-level) machines. The default value is 60, which means that SmartScan-related processes cannot use CPU over 60%.
Below are some rough data for reference:
  • For Core 2 Duo processor, high level machine, it takes 1~2 minutes CPU high (only one core) to generate diffs.
  • For P4 2.0G non-hyper thread low level machine, it takes 11~13 minutes 60% CPU usage to generate diffs.
  • For middle level machine spec, it takes time and CPU usage in between.
Details
Public
To resolve this issue, you need to change the CPU limit of the Smart Scan-related processes or disable SmartScan to switch all clients to conventional scan mode. Select one of the two options below:
Option A
  1. Open the ..\Program Files\Trend Micro\Officescan\PCCSRV\WSS\AU.ini file.
  2. Look for the “CPULimit” parameter and modify its value.
    Note: The recommended CPU limit is 60, but it still depends on your judgment on what limit you will allocate to SmartScan.
    The trade-off for low CPU usage is the longer GenDIff time and that Gendiff is launched on an hourly basis.
  3. Save and close the AU.ini file.
  4. Restart the OfficeScan Master Service.
Option B
Disable SmartScan and switch all clients to Conventional Scan mode.
  1. Log on to the OfficeScan management console.
  2. Go to Networked Computers > Client Management > OfficeScan Server.
  3. Click on the Settings button.
  4. On the “Scan Methods” window, tick the Conventional scan radio button.
  5. Click Save.
Premium
Internal
Rating:
Category:
Configure; Troubleshoot
Solution Id:
1054191
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