Entry cache size

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You must determine the optimum entry cache size to store and retrieve maximum entry IDs from the cache to improve the search performance.

To determine the required entry cache size, run the workload with the entry cache set to different sizes and measure the differences in operations per second. For example, Figure 1 shows varying operations per second based on different entry cache sizes.

Varying the size of the entry cache and measuring operations per second — Figure 1. Varying the size of the entry cache

Based on the results in Figure 1, an entry cache large enough to hold 460,000 entries results in the optimum performance. There is no benefit in configuring the entry cache larger than the value that result in best performance. Setting the entry cache at 460,000 results in four times as many operations per second than when the entry cache is set to zero. To find the best cache size for your workload, you must run your workload with different cache sizes. For more information about setting the cache size, see LDAP cache configuration variables.

Note: A test with entry cache size set to 345000 results in unpredictable performance. The nature of the test case, workload, and cache size set might affect performance.