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ircd::db: Use a zero soft-limit to yield all requests when saturated; prefetch condition.
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@ -109,6 +109,7 @@ ircd::db::request
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"db req",
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size_t(request_pool_stack_size),
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0, // don't prespawn because this is static
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0, // zero-size queue will yield submitter
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};
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/// This mutex is necessary to serialize entry into rocksdb's write impl
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@ -9859,6 +9860,9 @@ ircd::db::prefetch(column &column,
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if(cached(column, key, gopts))
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return;
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if(!request.avail())
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return;
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request([column(column), key(std::string(key)), gopts]
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() mutable
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{
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