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added session setting to control disk buffer pool allocation sizes

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Arvid Norberg
2009-05-12 18:52:05 +00:00
parent 46c286eea3
commit 85bf463e11
4 changed files with 18 additions and 4 deletions
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6
docs/manual.rst
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@@ -3369,6 +3369,7 @@ session_settings
bool auto_upload_slots_rate_based;
bool use_parole_mode;
int cache_size;
int cache_buffer_chunk_size;
int cache_expiry;
bool use_read_cache;
bool disk_io_no_buffer;
@@ -3613,6 +3614,11 @@ send or receive buffer also count against this limit. Send and receive buffers
will never be denied to be allocated, but they will cause the actual cached blocks
to be flushed or evicted.
Disk buffers are allocated using a pool allocator, the number of blocks that
are allocated at a time when the pool needs to grow can be specified in
``cache_buffer_chunk_size``. This defaults to 16 blocks. Lower numbers
saves memory at the expense of more heap allocations. It must be at least 1.
``cache_expiry`` is the number of seconds from the last cached write to a piece
in the write cache, to when it's forcefully flushed to disk. Default is 60 second.