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ircd:Ⓜ️:dbs: Add conf item toggling indexer prefetching.

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This commit is contained in:
Jason Volk 2020-10-31 07:02:41 -07:00
parent c17c96d965
commit c56b4a4ee9
2 changed files with 13 additions and 1 deletions
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1
include/ircd/m/dbs/dbs.h
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@ -21,6 +21,7 @@ namespace ircd::m::dbs
// General confs
extern conf::item<bool> cache_enable;
extern conf::item<bool> cache_comp_enable;
extern conf::item<bool> prefetch_enable;
extern conf::item<size_t> mem_write_buffer_size;
extern conf::item<size_t> sst_write_buffer_size;

13
matrix/dbs.cc
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@ -32,6 +32,17 @@ ircd::m::dbs::cache_comp_enable
{ "default", false },
};
/// Coarse toggle for the prefetch phase before the transaction building
/// handlers (indexers) are called. If this is false, prefetching will be
/// disabled; otherwise the write_opts passed to write() control whether
/// prefetching is enabled.
decltype(ircd::m::dbs::prefetch_enable)
ircd::m::dbs::prefetch_enable
{
{ "name", "ircd.m.dbs.prefetch.enable" },
{ "default", true },
};
/// The size of the memory buffer for new writes to the DB (backed by the WAL
/// on disk). When this buffer is full it is flushed to sorted SST files on
/// disk. If this is 0, a per-column value can be used; otherwise this value
@ -195,7 +206,7 @@ try
};
size_t ret(0);
if(likely(opts.prefetch))
if(prefetch_enable && opts.prefetch)
ret = _prefetch(txn, event, opts);
if(likely(opts.index))