Optimize the temporary space manager regarding small chunk allocations
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Key: CORE-3457
URL: http://tracker.firebirdsql.org/browse/CORE-3457
Project: Firebird Core
Issue Type: Improvement
Components: Engine
Reporter: Dmitry Yemanov
Currently, the temp space manager is not tuned for small allocations properly.
This is so because historically it has been developed primarily for
sorting/merging purposes that are known to work with big memory blocks, but now
it's also used for temporary blobs and record sets which can be quite small.
First of all, it allocates 1MB of memory even for a few bytes of the requested
temporary space. In the concurrent environment, it could be a problem, forcing
other processes to swap their temporary data to disk instead of using the
available memory.
Second, the internal segment allocator uses the linear search which is
sub-optimal when number of segments is large (many small blocks). This issue
manifests itself while releasing thousands of tiny temporary blobs at the
transaction completion.
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