[pgpointcloud] Chipper and Cache

[Roger Bedell]

Talking to Howard, he says that max_cache_blocks should be 1 and
cache_block_size should be absent to get fastest import times because
everything is loaded into memory in one big block.

<Filter type="filters.chipper">
      <Option name="capacity">400</Option>
      <Filter type="filters.cache">
        <Option name="max_cache_blocks">1</Option>

instead of:

<Filter type="filters.chipper">
      <Option name="capacity">400</Option>
      <Filter type="filters.cache">
        <Option name="max_cache_blocks">3</Option>
        <Option name="cache_block_size">321840</Option>

Problem is that Windows 32 bit can't do this, it bombs out when allocating
the chipper buffer. Any ideas how to get decent performance using the
cache? In fact, how does the cache work?

Thanks,
Roger
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