As noted in SAS Note 31147, a new environment variable, TKOPT_KEEPPOOL, was created to improve performance for tasks that heavily use threaded-kernel memory. As usage and the content that is necessary for threaded-kernel memory has increased, some issues have been found with regard to enabling the TKOPT_KEEPPOOL environment variable. The following issues have been identified:

1. A SAS^® session might stop responding until you manually cancel and restart it or until the site-defined inactive timeout interval is met, which occurs when the available memory is nearly capped.
2. SQL queries might not respond when utility files (UTILLOC) are required. This does not occur if the WORK library is allocated to UNIX file system space and if the UTILLOC=WORK system option is in effect.
3. Under heavy server loads, failures that are related to insufficient memory can occur.
4. Memory failures occurred for the SAS^® Metadata Server during internal-user and endurance-performance benchmark testing. The testing included 250 concurrent user scenarios and 10,000 users that are defined within the metadata-server repository. The metadata server was defined with a 1.5 GB region.
5. Poor performance occurs with the Adapter Setup Wizard in SAS^® IT Resource Management 3.2.
6. In SAS IT Resource Management 3.2, the metadata deployment fails with insufficient memory.

Click the Hot Fix tab in this note to access the hot fix for this issue.

Note: This hot fix requires that you already have installed the third maintenance release for SAS 9.2 (TS2M3) on your system. After you install this hot fix, remove the TKOPT_KEEPPOOL environment variable from the TKMVSENV file.

Operating System and Release Information

A fix for this issue for Base SAS 9.21_M3 is available at: