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ircd::db: Add parallel read suite to internal interface.

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This commit is contained in:
Jason Volk 2020-06-08 18:19:55 -07:00
parent 4a1f04823f
commit fc9c952ba8
2 changed files with 94 additions and 0 deletions
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91
ircd/db.cc
View file

@ -7964,6 +7964,97 @@ ircd::db::_seek(database::column &c,
return ret;
}
//
// parallel read suite
//
namespace ircd::db
{
static void _seek(const vector_view<_read_op> &, const vector_view<rocksdb::Status> &, const vector_view<rocksdb::PinnableSlice> &, const rocksdb::ReadOptions &);
}
bool
ircd::db::_read(const vector_view<_read_op> &op,
const rocksdb::ReadOptions &ropts,
const _read_closure &closure)
{
assert(op.size() >= 1);
assert(op.size() <= IOV_MAX);
const size_t &num
{
op.size()
};
rocksdb::Status status[num];
rocksdb::PinnableSlice val[num];
_seek(op, {status, num}, {val, num}, ropts);
if(closure) for(size_t i(0); i < op.size(); ++i)
{
const column::delta &delta
{
std::get<1>(op[i]), slice(val[i])
};
if(!closure(std::get<0>(op[i]), delta, status[i]))
return false;
}
return true;
}
void
ircd::db::_seek(const vector_view<_read_op> &op,
const vector_view<rocksdb::Status> &ret,
const vector_view<rocksdb::PinnableSlice> &val,
const rocksdb::ReadOptions &ropts)
{
assert(ret.size() == op.size());
assert(ret.size() == val.size());
const ctx::stack_usage_assertion sua;
const ctx::uninterruptible::nothrow ui;
assert(op.size() >= 1);
database &d(std::get<0>(op[0]));
const size_t &num
{
op.size()
};
rocksdb::Slice key[num];
std::transform(begin(op), end(op), key, []
(const auto &op)
{
return slice(std::get<1>(op));
});
rocksdb::ColumnFamilyHandle *cf[num];
std::transform(begin(op), end(op), cf, []
(auto &op_)
{
auto &op(const_cast<_read_op &>(op_));
database::column &c(std::get<column>(op));
return static_cast<rocksdb::ColumnFamilyHandle *>(c);
});
#ifdef RB_DEBUG_DB_SEEK
const ircd::timer timer;
#endif
d.d->MultiGet(ropts, num, cf, key, val.data(), ret.data());
#ifdef RB_DEBUG_DB_SEEK
log::debug
{
log, "[%s] %lu:%lu SEEK parallel:%zu in %ld$us",
name(d),
sequence(d),
sequence(opts.snapshot),
ret.size(),
timer.at<microseconds>().count(),
};
#endif
}
//
// iterator seek suite

3
ircd/db.h
View file

@ -121,6 +121,9 @@ namespace ircd::db
std::pair<string_view, string_view> operator*(const rocksdb::Iterator &);
// [GET] read suite
using _read_op = std::tuple<column, string_view>;
using _read_closure = std::function<bool (column &, const column::delta &, const rocksdb::Status &)>;
bool _read(const vector_view<_read_op> &, const rocksdb::ReadOptions &, const _read_closure & = {});
size_t _read(std::nothrow_t, column &, const string_view &key, const rocksdb::ReadOptions &, const column::view_closure & = {});
size_t _read(column &, const string_view &key, const rocksdb::ReadOptions &, const column::view_closure & = {});