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Allow sync throttling #139

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Allow sync throttling #139

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1 change: 1 addition & 0 deletions lib/pgsync/client.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,7 @@ def slop_options
o.boolean "--defer-constraints-v2", "defer constraints", default: false
o.boolean "--disable-integrity", "disable foreign key triggers", default: false
o.integer "-j", "--jobs", "number of tables to sync at a time"
o.integer "--throttle-bytes-per-second", "limit the sync to roughly this many bytes per second"

# replaced by v2
o.boolean "--defer-constraints", "defer constraints", default: false, help: false
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6 changes: 6 additions & 0 deletions lib/pgsync/task.rb
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Expand Up @@ -213,11 +213,17 @@ def copy(source_command, dest_table:, dest_fields:)

source.log_sql(source_command)
destination.log_sql(destination_command)
bytes_count = 0
start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)

destination.conn.copy_data(destination_command) do
source.conn.copy_data(source_command) do
while (row = source.conn.get_copy_data)
while opts[:throttle_bytes_per_second] && (bytes_count / (Process.clock_gettime(Process::CLOCK_MONOTONIC) - start_time)) > opts[:throttle_bytes_per_second]
sleep(0.01)
end
destination.conn.put_copy_data(row)
bytes_count += row.bytesize
end
end
end
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