16 the most recently used index entries are cached in RAM. </p> |
16 the most recently used index entries are cached in RAM. </p> |
17 <p>The following figure shows how a client request is completed using the |
17 <p>The following figure shows how a client request is completed using the |
18 cache functionality in the Message Server. </p> |
18 cache functionality in the Message Server. </p> |
19 <fig id="GUID-43D2AE30-9221-500A-B934-5D3636168273"> |
19 <fig id="GUID-43D2AE30-9221-500A-B934-5D3636168273"> |
20 <title> Caching architecture </title> |
20 <title> Caching architecture </title> |
21 <image href="GUID-53A2CA11-2ABF-5ED7-A26C-7BE9FD9A1D22_d0e284883_href.png" placement="inline"/> |
21 <image href="GUID-53A2CA11-2ABF-5ED7-A26C-7BE9FD9A1D22_d0e281197_href.png" placement="inline"/> |
22 </fig> |
22 </fig> |
23 <section id="GUID-D3F3D019-736E-4527-8099-9BE8883CF37C"><title>Creating and |
23 <section id="GUID-D3F3D019-736E-4527-8099-9BE8883CF37C"><title>Creating and |
24 maintaining free space in memory</title> <p>Memory allocation to the cache |
24 maintaining free space in memory</title> <p>Memory allocation to the cache |
25 is done incrementally, to reduce the Message Server start up time. When the |
25 is done incrementally, to reduce the Message Server start up time. When the |
26 Message Server starts, only a percentage of the maximum cache size (<codeph>MsvMaximumCacheSize</codeph>) |
26 Message Server starts, only a percentage of the maximum cache size (<codeph>MsvMaximumCacheSize</codeph>) |
32 is illustrated in the following figures, based on the default values (shown |
32 is illustrated in the following figures, based on the default values (shown |
33 in the preceding table). </p> <p>When Message Server starts, the cache is |
33 in the preceding table). </p> <p>When Message Server starts, the cache is |
34 created with an initial size of 410KB (40 percent of 1024KB). If 70 percent |
34 created with an initial size of 410KB (40 percent of 1024KB). If 70 percent |
35 of the free space in the cache gets used the server allocates an additional |
35 of the free space in the cache gets used the server allocates an additional |
36 205KB (20 percent of 1024). </p> <fig id="GUID-CA4A08C8-C4E8-575F-8F03-F3D1F6579E5F"> |
36 205KB (20 percent of 1024). </p> <fig id="GUID-CA4A08C8-C4E8-575F-8F03-F3D1F6579E5F"> |
37 <image href="GUID-B459E37A-BECE-5087-9827-C93310890674_d0e284915_href.png" placement="inline"/> |
37 <image href="GUID-B459E37A-BECE-5087-9827-C93310890674_d0e281229_href.png" placement="inline"/> |
38 </fig> <p>Message Server can make two further 205KB allocations which it does |
38 </fig> <p>Message Server can make two further 205KB allocations which it does |
39 as use reaches 70 percent of the memory already allocated. </p> <fig id="GUID-21A40614-046B-56DD-9DDD-34B2F9681B5C"> |
39 as use reaches 70 percent of the memory already allocated. </p> <fig id="GUID-21A40614-046B-56DD-9DDD-34B2F9681B5C"> |
40 <image href="GUID-107F7BC4-F776-512D-AD6F-1674B7ED19B5_d0e284923_href.png" placement="inline"/> |
40 <image href="GUID-107F7BC4-F776-512D-AD6F-1674B7ED19B5_d0e281237_href.png" placement="inline"/> |
41 </fig> <p>If more than 70 percent of the first two allocated memory chunks |
41 </fig> <p>If more than 70 percent of the first two allocated memory chunks |
42 is used, an additional 20 percent of memory is added to the free space. </p> <fig id="GUID-EBF4FF85-D6D6-518C-9391-C3AFF8821F83"> |
42 is used, an additional 20 percent of memory is added to the free space. </p> <fig id="GUID-EBF4FF85-D6D6-518C-9391-C3AFF8821F83"> |
43 <image href="GUID-5E380880-9DBB-51D7-8942-829C6FD788C2_d0e284931_href.png" placement="inline"/> |
43 <image href="GUID-5E380880-9DBB-51D7-8942-829C6FD788C2_d0e281245_href.png" placement="inline"/> |
44 </fig> </section> |
44 </fig> </section> |
45 </conbody></concept> |
45 </conbody></concept> |