Changes between Version 4 and Version 6 of Ticket #24637


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Timestamp:
2026-02-13T22:57:02+01:00 (17 hours ago)
Author:
zkir
Comment:

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  • Ticket #24637 – Description

    v4 v6  
    1717== Performance and memory impact
    1818
    19 **Performance impact:** Performance tests via CLI **DO NOT** reveal any performance degradation (See detailed tests result in the comments below)
     19**Performance impact:** Performance tests via CLI **DO NOT** reveal any performance degradation (See detailed tests result in the comments below), which is expected, HashMap with just several items work quite fast.
    2020
    21 **Memory impact:** Additional **48 bytes** are consumed by the newly added HashMap per OsmPrimitive. In comparison,  existing StyleCache field consumes 24 bytes.
    22 
    23     size of HashMap: java.util.HashMap object internals:
    24     OFF  SZ                       TYPE DESCRIPTION               VALUE
    25       0   8                            (object header: mark)     0x0000000000000009 (non-biasable; age: 1)
    26       8   4                            (object header: class)    0x002013d8
    27      12   4              java.util.Set AbstractMap.keySet        null
    28      16   4       java.util.Collection AbstractMap.values        null
    29      20   4   java.util.HashMap.Node[] HashMap.table             [(object), null, null, null, null, null, null, null, null, null, null, null, null, null, null, null]
    30      24   4              java.util.Set HashMap.entrySet          null
    31      28   4                        int HashMap.size              1
    32      32   4                        int HashMap.modCount          7
    33      36   4                        int HashMap.threshold         12
    34      40   4                      float HashMap.loadFactor        0.75
    35      44   4                            (object alignment gap)
    36     Instance size: 48 bytes
     21**Memory impact:** Additional **48 bytes** are consumed by the newly added HashMap per OsmPrimitive. For comparison,  existing StyleCache field consumes 24 bytes (per OsmPrimitive).
    3722
    3823== References