VSAPI engine multi-threaded scanning support in OfficeScan (OSCE)

Product / Version includes:

OfficeScan 11.0

Last updated: 2025/05/08

Solution ID: KA-0006950

Category: SPEC

Summary

Machine performance issues appear when real-time scanning is enabled. To help address these, administrators need know the following about the Virus Scan Application Programming Interface (VSAPI) scan engine:

Does OSCE real-time scanning perform sequential scanning or does it do parallel scanning using a multi-thread approach?
Are there any available settings to adjust the number of threads used for scanning?

The scan engine includes three drivers: tmpreflt.sys, tmxpflt.sys, and vsapint.sys.

The VSAPI scan engine runs in multi-threaded mode. Hooked file Input/Output will be put into a queue and 10 scanning threads are available to process the queue.
There are no available settings to adjust the number of threads used.

If performance issues are encountered during real-time scans, refer to the Recommended solutions to high CPU utilization caused by NTRTScan or DBServer.exe KB article to troubleshoot the issue.

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VSAPI engine multi-threaded scanning support in OfficeScan (OSCE)

VSAPI engine multi-threaded scanning support in OfficeScan (OSCE)

Product / Version includes:

Summary