A Question on the Pages MPOOL Allocation

Hello
I have a question about the allocation of pages in MPOOL.
I noticed that for BDB2.7.7, if there are open an environment with DB_MPOOL_PRIVATE, a block of memory will be awarded for cache MPOOL (size is N * PAGESIZE). Pages requested by the access method are allocated from this memory block important, no bunch of other memory is allocated for the pages. Allocated pages from and free of MPOOL are implemented by __db_shalloc and __db_shalloc_free.
However, for BDB4.6.18, if it is open a DB_PRIVATE environment, it seems that this page requested by the access method are allocated from the memory of heap on request. I don't know if my interpretation is right or wrong, but if allocating memory on demand will cause decreased performance?

Thank you!
Woody

Hey Woody,

Change to use ordinary malloc / free for the memory management in a private (in DB 4.3, 2005) environment was an improvement in the net return. One of the reasons are that allocateurs system are more sophisticated than the code shared Berkeley DB used to use for managing memory (our code has improved in this area in the meantime).

However, concurrency is the main victory: we previously locked the mutex for the region in which we allocate or free memory. This blocked other operations in addition to the memory management. When you use malloc and free, this is obviously not required, and most systems have a multi-threads available allocators who perform better than simple simultaneous load, single-threaded allocator.

Also, note that Berkeley DB tries to avoid the release of most of the objects allocated in the regions: there are pools of free objects for the most part, that greatly reduces the load on the allocator.

Of course, there may be situations where our code of simple allocation would beat malloc/free of a particular system: If you have results of performance indicating a significant difference, please let us know.

Kind regards
Michael Cahill, Oracle Berkeley DB.

Tags: Database

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