tokio-postgres: use tokio mpsc for CopyBoth streams
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The tokio implementation of mpsc channels seems to be more sophisticated and performant than the one in futures_channel. Since the channels used by the CopyBoth streams transfer a large amount of data during replication this PR switches the implementation to tokio. This PR doesn't yet alter the size of the channels in order to do an apples to apples comparison. A subsequent test should be performed with larger buffers between the producer and consumer tasks. Signed-off-by: Petros Angelatos <petrosagg@gmail.com>
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The tokio implementation of mpsc channels seems to be more sophisticated and performant than the one in futures_channel. Since the channels used by the CopyBoth streams transfer a large amount of data during replication this PR switches the implementation to tokio.
This PR doesn't yet alter the size of the channels in order to do an apples to apples comparison. A subsequent test should be performed with larger buffers between the producer and consumer tasks.